CN116398567B - Corrugated thin-wall three-layer buffering energy-absorbing structure and manufacturing method thereof - Google Patents
Corrugated thin-wall three-layer buffering energy-absorbing structure and manufacturing method thereof Download PDFInfo
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- CN116398567B CN116398567B CN202310302254.8A CN202310302254A CN116398567B CN 116398567 B CN116398567 B CN 116398567B CN 202310302254 A CN202310302254 A CN 202310302254A CN 116398567 B CN116398567 B CN 116398567B
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- 230000003139 buffering effect Effects 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 230000008719 thickening Effects 0.000 claims abstract description 109
- 239000003292 glue Substances 0.000 claims abstract description 96
- 238000007789 sealing Methods 0.000 claims abstract description 69
- 238000010008 shearing Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 8
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 230000002572 peristaltic effect Effects 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 35
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 24
- 210000000481 breast Anatomy 0.000 description 13
- 230000008569 process Effects 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
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- 239000002184 metal Substances 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- XDVOLDOITVSJGL-UHFFFAOYSA-N 3,7-dihydroxy-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound O1B(O)OB2OB(O)OB1O2 XDVOLDOITVSJGL-UHFFFAOYSA-N 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
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- 238000006073 displacement reaction Methods 0.000 description 2
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- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/123—Deformation involving a bending action, e.g. strap moving through multiple rollers, folding of members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0233—Materials; Material properties solids deforming plastically in operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
- F16F2224/048—High viscosity, semi-solid pastiness
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a corrugated thin-wall three-layer buffering energy-absorbing structure and a manufacturing method thereof, wherein the corrugated thin-wall three-layer buffering energy-absorbing structure comprises an outer corrugated pipe, an inner corrugated pipe, annular shearing thickening glue, a plurality of arc-shaped baffle plates, an upper sealing cover and a lower sealing cover, the outer corrugated pipe is arranged vertically, the inner corrugated pipe is arranged coaxially, the annular shearing thickening glue is positioned in a cavity between the outer corrugated pipe and the inner corrugated pipe and is filled in an annular mode at intervals along the vertical direction, the arc-shaped baffle plates are positioned in an inner cavity of the inner corrugated pipe, the upper sealing cover is used for sealing the upper ends of the inner corrugated pipe and the outer corrugated pipe, and the lower sealing cover is used for sealing the lower ends of the inner corrugated pipe and the outer corrugated pipe, and the upper ends and the lower ends of the arc-shaped baffle plates are respectively inserted into the upper sealing cover and the lower sealing cover. When the invention is impacted by axial impact, the inner corrugated pipe and the outer corrugated pipe are impacted together with the arc-shaped baffle plate, and start to bend and deform under the synergistic effect, so that the axial impact force is effectively absorbed; when impact collision is continued, the annular shear thickening glue effectively induces structural deformation and energy absorption, and the multilayer and interval arrangement can promote the stable deformation of the structure, improve the integral energy absorption characteristic and play a role in buffering protection.
Description
Technical Field
The invention relates to the field of buffering and energy absorbing of large structures such as buildings, ocean platforms and the like and vehicles such as ships, spaceflight, automobiles, high-speed rails and the like in the impact collision process, in particular to a corrugated thin-wall three-layer buffering and energy absorbing structure and a manufacturing method thereof.
Background
With the popularity of the ship transportation industry, the role played by ships in logistics transportation personnel transportation is more and more important, and when the ships are on the side, if severe weather or other unexpected conditions are met, collision between two ships or between a ship body and a wharf structure is easily caused, long-term collision is easy to cause the damage of the ship body and even threaten the safety of equipment and personnel on the ship, and meanwhile, economic loss is accompanied. In order to reduce injury to the hull and personnel from such events, it is desirable to install a protective device in the area of the hull where the hull is prone to collision. In the protection field, the metal thin-wall energy-absorbing structure is widely applied to various production and manufacturing because of the advantages of light weight, low cost and easiness in manufacturing, and is a protection structure formed by mixing and combining a metal thin-wall pipe fitting of a main body and a structure derived from the metal thin-wall pipe fitting; compared with the traditional energy absorption structure, the structure generates plastic deformation through the structure during collision impact, so that energy generated in collision impact load is consumed, and the structure has good deformation effect and absorbs more energy.
Shear Thickening Glue (STG) is a viscoelastic body prepared by reacting boric acid with hydroxy silicone oil and the like under certain conditions, and has viscosity changing along with the change of a shear rate, and has the performance of shear hardening under the promotion of the shear rate. The shear thickening glue is a plasticine-shaped sticky body in a normal state, has creep relaxation material property, can be instantly converted from a sticky body into a solid state when being impacted or sheared, can control the softness and hardness of the shear thickening glue in the normal state by adding silicon dioxide, and can limit the creep relaxation property of STG, the modified shear thickening glue has stable form in the normal state and has thickening effect, and can still be thickened and hardened when being impacted or sheared, a large amount of energy can be absorbed in the process, and an additional excitation triggering device is not needed in the conversion process. Because of this property of shear thickening gums, shear thickening gums are often filled in energy absorbing structures to further optimize the energy absorbing properties of the structure.
In the prior art (CN 114962511A), a double-tube thin-wall energy absorbing structure for shearing thickening fluid is proposed, wherein when a corrugated pipe is impacted, bending moment and stress at the corrugated part are larger, so that the corrugated pipe is easy to guide the structure to deform when the corrugated pipe is impacted; the rigidity of the area of the pane tube along the periphery of the window is smaller due to the window opening, and the pane tube can also guide the structure to deform at the window; however, in the energy absorption stage, the platform is shorter and not very stable; the initial peak force is somewhat reduced, but still greater, and the total energy absorption remains to be improved.
Therefore, there is a need to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to: the first object of the invention is to provide a corrugated thin-wall three-layer buffering energy-absorbing structure capable of effectively improving total energy absorption, which can play a good role in protecting a protected structure or personnel under low-speed collision and impact loads such as ship berthing.
The second object of the invention is to provide a manufacturing method of the corrugated thin-wall three-layer buffering energy-absorbing structure.
The technical scheme is as follows: in order to achieve the above purpose, the invention discloses a corrugated thin-wall three-layer buffering energy-absorbing structure, which comprises an outer corrugated pipe, an inner corrugated pipe, annular shearing thickening glue, a plurality of arc-shaped baffle plates, an upper sealing cover and a lower sealing cover, wherein the outer corrugated pipe is arranged vertically, the inner corrugated pipe is arranged coaxially, the annular shearing thickening glue is positioned in a cavity between the outer corrugated pipe and the inner corrugated pipe and is filled in an annular mode at intervals along the vertical direction, the arc-shaped baffle plates are positioned in an inner cavity of the inner corrugated pipe, the upper sealing cover is used for sealing the upper ends of the inner corrugated pipe and the outer corrugated pipe, and the lower sealing cover is used for sealing the lower ends of the inner corrugated pipe and the outer corrugated pipe, and the upper ends and the lower ends of the arc-shaped baffle plates are respectively inserted into the upper sealing cover and the lower sealing cover.
Wherein, a plurality of arc breast boards are arranged around the axial central line of the inner bellows at intervals and enclose into a waist-shaped inner tube.
Preferably, annular shear thickening glue is filled in the cavity between the inner corrugated pipe and the waist-shaped inner pipe at intervals along the vertical direction, and windows are formed in the inner corrugated pipe.
Furthermore, the waist-shaped radian of the waist-shaped inner tube has a parabola y=a 1 x 2 +C 1 Wherein A is 1 Determining the amplitude of the waist-shaped inner tube, namely the maximum radius of the waist-shaped inner tube, C 1 The height of the waist-shaped inner tube is determined.
Further, a plurality of arc breast boards are arranged in the inner corrugated pipe in a crossing way.
Preferably, the corrugation of the inner corrugated pipe is formed byIs controlled by, wherein R 01 Is the radius of the inner bellows, A 01 Is the amplitude of the inner ripple tube, N 01 Is the number of waves of the inner corrugated tube, L 01 Is the length of the inner bellows.
Furthermore, the corrugation of the outer corrugated pipe is formed byIs controlled by, wherein R 02 Radius of outer bellows, A 02 For the amplitude of the outer bellows, N 02 Is the number of the external corrugated pipe, L 02 Is the length of the outer bellows.
Further, the annular shear thickening glue is modified shear thickening glue with certain hardness, and the annular shear thickening glue is made into an annular shape matched with the inner corrugated pipe and the outer corrugated pipe; after peristaltic relaxation, the height of the single annular shear thickening glue is D 1 The interval height between adjacent annular shear thickening adhesives is D 2 。
Furthermore, the upper sealing cover and the lower sealing cover are correspondingly provided with notches for inserting arc-shaped baffle plates.
The invention discloses a manufacturing method of a corrugated thin-wall three-layer buffering energy-absorbing structure, which comprises the following steps: firstly, welding or cementing the arc-shaped baffle plate at the position opposite to the notch of the lower sealing cover; after the arc-shaped baffle plate is fixed on the notch of the lower sealing cover, the lower sealing cover is provided with mounting marks of the inner corrugated pipe and the outer corrugated pipe; gluing or welding the inner corrugated pipe on the mark of the lower sealing cover; the annular shearing thickening glue which is matched with the inner corrugated pipe and the outer corrugated pipe in advance is firmly fixed at the bottom of the inner corrugated pipe by using structural glue; fixing the annular shear thickening glue layer by layer on the inner corrugated pipe, standing for more than 48h, and ensuring that the interval height of each layer after peristaltic relaxation of the annular shear thickening glue is D 2 The method comprises the steps of carrying out a first treatment on the surface of the After the annular shear thickening glue stands still, coating structural glue on an outer ring of the annular shear thickening glue; then the outer corrugated pipe is glued or welded on the lower sealing cover, and the annular shearing thickening glue can be fixed with the outer corrugated pipe; and finally, gluing or welding an upper sealing cover to finish sealing the pipe.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages:
(1) When the invention is impacted by axial impact, the inner corrugated pipe and the outer corrugated pipe are impacted together with the arc-shaped baffle plates, and the arc-shaped baffle plates start to bend and deform under the synergistic effect, and the arc-shaped baffle plates play a certain role in supporting and guiding deformation, thereby effectively absorbing the axial impact force; when the impact collision continues, the structure is further compressed, the annular shear thickening glue of the first layer is thickened and impacted, thickening and hardening begin, the annular shear thickening glue presses the volume of the thickening and hardening into the interval due to incompressible volume, and the annular shear thickening glue below is hardened due to force transmission; on the one hand, the thickening of the shear thickening glue further absorbs energy in the hardening process; on the other hand, the thickened and hardened shearing thickening glue and the pipe body generate a coupling effect, so that the structural deformation energy absorption can be effectively induced, and the annular shearing thickening glue arranged in multiple layers at intervals promotes the structural stable deformation, so that the integral energy absorption characteristic is improved, and the buffer protection effect is realized;
(2) The middle partition arranged shear thickening glue can effectively improve the energy absorption characteristic; because the volume is incompressible, annular shear thickening glue is impacted and compressed and needs deformation space, the interval arrangement not only provides deformation space, but also can generate domino effect, when the first layer of annular shear thickening glue is impacted, impact force is transmitted to the annular shear thickening glue below through force transmissibility, the annular shear thickening glue below is promoted to be thickened and hardened together, and a coupling effect is generated with a pipe body to induce plastic deformation of a thin-wall structure, so that the total energy absorption is effectively improved.
(3) The invention utilizes the thickening and hardening properties of the shear thickening glue when impacted to increase the energy absorption of the structure: firstly, the shear thickening glue generates a coupling effect with the inner pipe of the structure after being forced and hardened, so that the deformation degree of the structure is greatly increased, and the energy absorption is increased; secondly, the shear thickening glue absorbs energy when being thickened and hardened when being impacted, and meanwhile, the shear thickening glue belongs to a viscoelastic body, so that the problem of tightness is not required to be worried;
(4) The invention combines the inner and outer corrugated pipes with the waist-shaped inner pipe, when the inner and outer corrugated pipes are impacted, the bending moment and stress at the corrugated position are larger than those at other positions, so that the inner and outer corrugated pipes are easy to lead the structure to deform when impacted; the area around the waist-shaped inner tube and the inner bellows is also led to deform at the inner arc due to the waist-shaped inner bending radian; because of the inner corrugated pipe and the outer corrugated pipe, a synergistic effect is formed with the combined waist-shaped inner pipe, the combined waist-shaped inner pipe cannot collapse too fast due to low strength, sufficient energy absorption time is given, and the stability of the structure is ensured.
(5) Due to the existence of the inner corrugated pipe, the outer corrugated pipe and the waist-shaped inner pipe, the three layers of thin-wall pipes can axially collapse under the condition of impact collision, the occurrence of side bending is prevented, and the structure can be fully deformed to absorb energy; compared with the traditional single-tube structure, the structure has stronger axial bearing capacity, low self-mass and higher energy absorption effect.
Drawings
FIG. 1 is a schematic view of the structure of the present invention, wherein the number of breast boards in the waist-shaped inner tube is 4;
FIG. 2 is a schematic view of the structure of the inner corrugated outer tube according to the present invention;
FIG. 3 is a schematic view of the structure of the outer corrugated tube of the present invention;
FIG. 4 is a schematic view of the waist-shaped inner tube according to the present invention;
FIG. 5 is a schematic view of the structure of the upper and lower covers of the present invention;
FIG. 6 is a schematic view of a single layer annular shear thickening glue according to the present invention;
FIG. 7 is a schematic diagram of a manufacturing process of the present invention;
FIG. 8 is a schematic view of the structure of the inner tube of the present invention;
FIG. 9 is a schematic representation of the energy absorption results of a cross-web arrangement of the present invention;
FIG. 10 is a graph comparing impact force versus displacement curves for various waist-type inner tube energy absorbing structures of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, the invention discloses a corrugated thin-wall three-layer buffering energy-absorbing structure which comprises an inner corrugated pipe 1, an outer corrugated pipe 2, annular shearing thickening glue 4, an upper sealing cover 5, a lower sealing cover 6 and an arc-shaped baffle plate 7, wherein the inner corrugated pipe 1, the outer corrugated pipe 2, a waist-shaped inner pipe 3, the upper sealing cover 5 and the lower sealing cover 6 are made of metal or novel high polymer materials with good plasticity and toughness, such as stainless steel or Q235.
The corrugated pipe 1 and the outer corrugated pipe 2 are coaxially arranged at the same height, and the corrugation of the inner corrugated pipe is formed byIs controlled by, wherein R 01 Is the radius of the inner bellows, A 01 Is the amplitude of the inner ripple tube, N 01 Is the number of waves of the inner corrugated tube, L 01 Is the length of the inner bellows. The corrugation of the outer corrugated pipe is formed byIs controlled by, wherein R 02 Radius of outer bellows, A 02 For the amplitude of the outer bellows, N 02 Is the number of the external corrugated pipe, L 02 Is the length of the outer bellows.
As shown in fig. 6, annular shear thickening glue 4 is filled in a cavity between the outer corrugated pipe 2 and the inner corrugated pipe 1 at intervals along the vertical direction, the annular shear thickening glue is modified to have certain hardness, and the annular shear thickening glue is made into an annular shape matched with the inner corrugated pipe and the outer corrugated pipe; after peristaltic relaxation, the height of the single annular shear thickening glue is D 1 The interval height between adjacent annular shear thickening adhesives is D 2 . The upper sealing cover 5 is used for sealing the upper ends of the inner corrugated pipe and the outer corrugated pipe, the lower sealing cover 6 is used for sealing the lower ends of the inner corrugated pipe and the outer corrugated pipe, a plurality of arc-shaped baffle plates 7 are distributed in the inner cavity of the inner corrugated pipe, the upper end and the lower end of each arc-shaped baffle plate 7 are respectively inserted into the upper sealing cover 5 and the lower sealing cover 6, the upper sealing cover 5 is correspondingly provided with a notch for inserting the arc-shaped baffle plates, and the lower sealing cover 6 is correspondingly provided with a notch for inserting the arc-shaped baffle plates.
As shown in fig. 4 and 5, a plurality of arcuate baffle plates 7 are arranged around the inner bellows axial centerline spaceThe device is surrounded into a waist-shaped inner tube 3, and the waist-shaped radian of the waist-shaped inner tube is provided with a parabola y=A 1 x 2 +C 1 Wherein A is 1 Determining the amplitude of the waist-shaped inner tube, namely the maximum radius of the waist-shaped inner tube, C 1 The height of the waist-shaped inner tube is determined. The radius of the corresponding upper and lower sealing covers is R 3 And notches are formed, the width W=theta of the notches is equal to the number K of the breast boards, and the gap between two adjacent notches is 360/K-theta.
Or a plurality of arc-shaped baffle plates 7 are arranged in the inner corrugated pipe 1 in a crossing way.
As shown in FIG. 7, the manufacturing method of the corrugated thin-wall three-layer buffering energy-absorbing structure comprises the following steps: firstly, welding or gluing the arc-shaped baffle plate 7 at the notch of the lower sealing cover 6; after the arc-shaped baffle plate 7 is fixed on the notch of the lower sealing cover 6, the lower sealing cover 6 is provided with mounting marks of the inner corrugated pipe and the outer corrugated pipe; the inner corrugated pipe 1 is glued or welded on the mark of the lower sealing cover; the annular shearing thickening glue which is matched with the inner corrugated pipe and the outer corrugated pipe in advance is firmly fixed at the bottom of the inner corrugated pipe by using structural glue; fixing the rest annular shear thickening glue layer by layer on the inner corrugated pipe, standing for 48h to ensure that the interval height of each layer after the peristaltic relaxation of the annular shear thickening glue is D 2 The method comprises the steps of carrying out a first treatment on the surface of the After the annular shear thickening glue stands still, coating structural glue on an outer ring of the annular shear thickening glue; after the annular shear thickening glue is fixed, coating structural glue on the outer ring of the annular shear thickening glue; then the outer corrugated pipe is glued or welded on the lower sealing cover, and the annular shearing thickening glue can be fixed with the outer corrugated pipe; and finally, gluing or welding an upper sealing cover to finish sealing the pipe.
In terms of processing technology, the production and manufacturing technology of the inner corrugated pipe, the outer corrugated pipe, the combined waist-shaped inner pipe, the upper sealing cover, the lower sealing cover and the annular shearing thickening glue used in the invention are as follows:
(1) Processing an inner corrugated pipe and an outer corrugated pipe: the inner corrugated pipe and the outer corrugated pipe used in the invention are manufactured by a method of hydraulic expansion of a thin-wall pipe in a mould, wherein the mould can be used for multiple times,
(2) Machining of a combined waist-shaped inner tube: the combined waist-shaped inner tube used in the invention is composed of the breast boards with different numbers, wherein the breast boards can be manufactured by adopting a laser cutting method, the process is simple, and the cost is low.
(3) Processing the upper sealing cover and the lower sealing cover: the upper sealing cover and the lower sealing cover used by the invention are manufactured by hydraulic expansion in a circular die, and the method is simple and easy to obtain.
(4) Preparation of annular shear thickening glue: the preparation method comprises the steps of preparing pyroboric acid and hydroxyl silicone oil according to a certain proportion, adding silicon dioxide to limit the creep relaxation characteristic of STG, and heating for a period of time at a certain reaction temperature to obtain the shear thickening glue; kneading the shearing thickening glue into annular shearing thickening glue with a certain height through the inner corrugated pipe and the outer corrugated pipe, wherein the annular shearing thickening glue is matched with the corrugations of the inner corrugated pipe and the outer corrugated pipe; the manufacturing method is simple and the cost is low.
The main energy absorption parts of the corrugated thin-wall three-layer buffering energy absorption structure filled with the multi-layer annular shearing thickening glue are an inner corrugated pipe 1, an outer corrugated pipe 2, a waist-shaped inner pipe 3 and the annular shearing thickening glue 4. When the structure is impacted by axial impact, the inner corrugated pipe 1 and the outer corrugated pipe 2 are impacted together with the waist-shaped inner pipe 3, bending deformation is started under the synergistic effect, and the waist-shaped inner pipe 3 plays a certain role in supporting and guiding deformation, so that the axial impact force is effectively absorbed; when the impact collision continues, the structure is further compressed, the annular shear thickening glue thickening 4 of the first layer is impacted and begins to be thickened and hardened, the annular shear thickening glue 4 can squeeze the volume of the thickened and hardened into a gap due to incompressible volume, and the annular shear thickening glue below is hardened due to force transmission; on the one hand: the process of thickening and hardening the shearing thickening glue needs energy absorption; on the other hand, the thickened and hardened shearing thickening glue can generate a coupling effect with the pipe body, so that structural deformation is effectively induced, and the annular shearing thickening glue is arranged in multiple layers at intervals to promote the structural deformation to be complete; thereby improving the integral energy absorption characteristic and playing a role of buffering protection.
Example 1
As shown in fig. 1, in example 1, the inner corrugated outer pipe 1, the outer corrugated pipe 2, the waist-shaped inner pipe 3, and the upper and lower covers 5 and 6 are all made of 304 stainless steel. Wherein the radius R of the inner bellows 1 01 Amplitude of inner bellows 1 =30mmA 01 Number of corrugations N of inner corrugated tube 1 =2 01 Length L of inner bellows 1 =6 01 Wall thickness t of inner bellows 1 =120 mm 01 =2mm; radius R of outer bellows 2 02 Amplitude a of the outer bellows 2 =45 mm 02 Number of corrugations N of outer corrugated tube 2 =2 02 Length L of outer bellows 2 =6 02 Wall thickness t of outer bellows 2 =120 mm 02 =2mm; waist-shaped radian parabola A of waist-shaped inner tube 1 ＝1/3，C 1 Height L of waist-shaped inner tube = -144/3 1 Minimum radius R of waist-shaped inner tube =120 mm 1 18mm, wall thickness t of waist-shaped inner tube 1 =2mm; the baffle intercept angle θ=30°; the radius of the upper and lower covers 5 and 6 is R 3 The slot opening of the upper and lower covers 5 and 6 should match the radian at the breast board, the slot opening width w=θ=30° of the upper and lower covers 5 and 6, the slot opening number of the upper and lower covers 5 and 6 is equal to the breast board number K, the gap between two adjacent slot openings is 360/K- θ, and the thickness of the upper and lower covers 5 and 6 is 2mm. The annular shear thickening glue 4 is prepared by firstly preparing pyroboric acid and hydroxyl silicone oil according to a certain proportion, adding silicon dioxide to limit the creep relaxation characteristic of STG, heating for a period of time at a certain reaction temperature to prepare the shear thickening glue, kneading the shear thickening glue into the annular shear thickening glue 4 with a certain height by an inner corrugated pipe and an outer corrugated pipe and matching the corrugations of the inner corrugated pipe and the outer corrugated pipe, and the interval height D of each layer of annular shear thickening glue 2 ＝10mm。
The waist-shaped inner tube 3 in example 1 adopts 4 forms: four-rail, six-rail, eight-rail, and ten-rail panels, as shown in fig. 8. Because of the different structural forms and sizes of the built-in waist-shaped inner tube, the structural quality of the embodiment is much lighter than that of the double-tube thin-wall energy-absorbing structure in the prior art. Compared with the corrugated/window thin-wall structure, the length L of the corrugated pipe in the corrugated/window thin-wall structure is 120mm, the corrugated amplitude of the corrugated pipe in the corrugated/window thin-wall structure is 2mm, the wavelength of the corrugated pipe in the corrugated/window thin-wall structure is 20mm, and the wall thickness of the corrugated pipe in the corrugated/window thin-wall structure is 2mm; the radius of the pane tube in the corrugated/window thin-wall structure is 20mm, the length of the pane tube in the corrugated/window thin-wall structure is 120mm, and the opening of the pane tube in the corrugated/window thin-wall structureThe number of window columns is 2, the number of windows in each column is 3, and the area of each window is 180mm 2； The radius of the rubber hose in the corrugated/window thin-wall structure is 19mm; the radius of the upper and lower covers in the corrugated/windowed thin-walled structure is 45mm. All metallic materials were 304 stainless steel. The pane tube of the corrugated/window thin-wall structure is filled with shear thickening liquid, the dispersed phase of the shear thickening liquid is nano silicon dioxide particles, and the dispersion medium is polyethylene glycol solution with the molecular weight of 200, and the mass fraction is 25%.
The mass of the collision is 2000kg, and the collision speed is 5m/s. The energy absorption, specific energy absorption and initial collision peak load of the corrugated/window thin-wall energy absorption structure and four groups of corrugated thin-wall three-layer buffer energy absorption structures containing multiple layers of annular shear thickening glue which are arranged at intervals are shown in table 1 when the structures are axially collapsed by 60mm, and the impact force-displacement curves are shown in fig. 10.
TABLE 1
As can be seen from the data in table 1, the specific energy absorption of the four corrugated thin-wall three-layer buffering energy absorption structures containing annular shear thickening fluids at intervals is higher than that of the corrugated/window structure filled with the shear thickening fluids; the order of preference for overall efficiency is: eight-railing panel, four-railing panel, six-railing panel, ten-railing panel and corrugated/window thin-wall energy absorbing structure. To sum up: under the same collision condition, the energy absorption efficiency of the four corrugated thin-wall three-layer buffer structures with the built-in different combined waist-shaped inner tubes in the embodiment 1 is higher than that of the corrugated/window thin-wall energy absorption structure of the comparison case, wherein the four-breast board structure has obvious advantages in energy absorption efficiency compared with the energy absorption structure of the comparison case, can absorb a large amount of energy, and the novel structure is relatively stable in the whole deformation process of the energy absorption stage as can be seen from fig. 10.
Example 2
As shown in fig. 9, a plurality of arc-shaped baffle plates 7 are arranged in a crossing manner on the inner corrugated tube 1. The number of the baffle plates can be referred to in the embodiment 1, and the baffle plates in the embodiment are arc-shaped, and the arc shape can ensure that the structure can be plastically deformed according to a preset path when being impacted; compared with the vertical arrangement of the breast boards, the number of the cross arrangement of the breast boards can stabilize the internal structure, the constraint conditions of the breast boards which are vertically arranged are at the upper end and the lower end, and the constraint conditions of the breast boards which are cross arranged are at the upper end and the lower end and the middle part, so that the instability phenomenon of the structure in the deformation process can be effectively improved, the deformation rate of the structure is improved, and the total energy absorption in the impact process is increased.
Example 3
The energy absorbing structure of example 1 was used, with the difference that: the annular shearing thickening glue is filled in the inner cavity between the inner corrugated pipe 1 and the waist-shaped inner pipe at intervals, and a window is arranged on the inner corrugated pipe 1, wherein the window can be in the shape of: rectangular, circular, polygonal, etc.; the filling mode of the embodiment 3 increases the content of the shear thickening glue, and the process of thickening and hardening the shear thickening glue not only absorbs a large amount of energy, but also can induce the plastic deformation of the whole structure through the coupling with the thin-wall structure; the inner pipe baffle plate is interacted with the shear thickening glue, the shear thickening glue is thickened after being disturbed by the baffle plate, and certain constraint support is given to the baffle plate, so that the structural stability is improved; the window is arranged, so that the thickening property of the shearing thickening glue can be effectively promoted, and the energy absorption property is improved. In addition, the shear thickening glue filled in the invention can be replaced by other energy-absorbing elastic materials such as shear thickening liquid, rubber, foam and the like.
Example 4
With the structure of embodiment 1, the only difference is that: the gapless waist-shaped inner tube formed by the breast boards has higher stability when being impacted, and is deformed in cooperation with the inner corrugated tube and the outer corrugated tube, so that the coupling effect is more obvious, more energy is absorbed, and the better buffering and energy absorbing effects are achieved.
Example 5
The structure of example 4 was employed. The only differences are: the shearing thickening glue is filled in the inner cavity of the gapless waist-shaped inner tube, so that the energy absorption and buffering effects can be further improved; in order to further strengthen the energy absorption and specific energy absorption of the structure, the materials of the inner corrugated pipe 1, the outer corrugated pipe 2, the combined waist-shaped inner pipe 3, the upper sealing cover 5 and the lower sealing cover 6 are replaced by novel polymer materials.
The preferred embodiments of the present invention have been described in detail above, but the design concept of the present invention is not limited thereto, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all such equivalent changes belong to the protection scope of the present invention.
Claims (9)
1. A corrugated thin-wall three-layer buffering energy-absorbing structure is characterized in that: the sealing device comprises an outer corrugated pipe (2) which is vertically arranged, an inner corrugated pipe (1) which is coaxially arranged, annular shearing thickening glue (4) which is positioned in a cavity between the outer corrugated pipe (2) and the inner corrugated pipe (1) and is filled in an annular mode at intervals along the vertical direction, a plurality of arc-shaped baffle plates (7) which are positioned in the inner cavity of the inner corrugated pipe, an upper sealing cover (5) which is used for sealing the upper ends of the inner corrugated pipe and the outer corrugated pipe, and a lower sealing cover (6) which is used for sealing the lower ends of the inner corrugated pipe and the outer corrugated pipe, wherein the upper end and the lower end of the arc-shaped baffle plates (7) are respectively inserted into the upper sealing cover (5) and the lower sealing cover (6); the annular shear thickening glue is modified shear thickening glue with certain hardness, and the annular shear thickening glue is made into an annular shape matched with the inner corrugated pipe and the outer corrugated pipe; after peristaltic relaxation, the height of the single annular shear thickening glue is D 1 The interval height between adjacent annular shear thickening adhesives is D 2 。
2. The corrugated thin-walled tri-layer buffering energy absorbing structure of claim 1, wherein: the arc-shaped baffle plates (7) are arranged around the axial center line of the inner bellows at intervals to form a waist-shaped inner tube (3).
3. The corrugated thin-walled tri-layer buffering energy absorbing structure of claim 2, wherein: annular shear thickening glue (4) filled in the cavity between the inner corrugated pipe (1) and the waist-shaped inner pipe (3) in an annular mode at intervals in the vertical direction, and a window is formed in the inner corrugated pipe (1).
4. The corrugated thin-walled tri-layer buffering energy absorbing structure of claim 2, wherein: the waistThe waist-shaped radian of the inner tube is parabolicWherein A is 1 Determining the amplitude of the waist-shaped inner tube, namely the maximum radius of the waist-shaped inner tube, C 1 The height of the waist-shaped inner tube is determined.
5. The corrugated thin-walled tri-layer buffering energy absorbing structure of claim 1, wherein: the arc-shaped baffle plates (7) are arranged in the inner corrugated pipe (1) in a crossing mode.
6. The corrugated thin-walled tri-layer buffering energy absorbing structure of claim 1, wherein: the corrugation of the inner corrugated pipe is formed byIs controlled by, wherein R 01 Is the radius of the inner bellows, A 01 Is the amplitude of the inner ripple tube, N 01 Is the number of waves of the inner corrugated tube, L 01 Is the length of the inner bellows.
7. The corrugated thin-walled tri-layer buffering energy absorbing structure of claim 1, wherein: the corrugation of the outer corrugated pipe is formed byIs controlled by, wherein R 02 Radius of outer bellows, A 02 For the amplitude of the outer bellows, N 02 Is the number of the external corrugated pipe, L 02 Is the length of the outer bellows.
8. The corrugated thin-walled tri-layer buffering energy absorbing structure of claim 1, wherein: the upper sealing cover (5) and the lower sealing cover (6) are correspondingly provided with notches for inserting arc-shaped baffle plates.
9. A manufacturing method based on the corrugated thin-wall three-layer buffering energy-absorbing structure of claim 8,the method is characterized by comprising the following steps of: firstly, welding or cementing the arc-shaped baffle plate at the position opposite to the notch of the lower sealing cover; after the arc-shaped baffle plate is fixed on the notch of the lower sealing cover, the lower sealing cover is provided with mounting marks of the inner corrugated pipe and the outer corrugated pipe; gluing or welding the inner corrugated pipe on the mark of the lower sealing cover; the annular shearing thickening glue which is matched with the inner corrugated pipe and the outer corrugated pipe in advance is firmly fixed at the bottom of the inner corrugated pipe by using structural glue; fixing the annular shear thickening glue layer by layer on the inner corrugated pipe, standing for 48h, and ensuring that the interval height of each layer after the peristaltic relaxation of the annular shear thickening glue is D 2 The method comprises the steps of carrying out a first treatment on the surface of the After the annular shear thickening glue stands still, coating structural glue on an outer ring of the annular shear thickening glue; then the outer corrugated pipe is glued or welded on the lower sealing cover, and the annular shearing thickening glue can be fixed with the outer corrugated pipe; and finally, gluing or welding an upper sealing cover to finish sealing the pipe.
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