CN112984017A - Bionic multistage energy absorption structure and preparation method thereof - Google Patents
Bionic multistage energy absorption structure and preparation method thereof Download PDFInfo
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- CN112984017A CN112984017A CN202110334035.9A CN202110334035A CN112984017A CN 112984017 A CN112984017 A CN 112984017A CN 202110334035 A CN202110334035 A CN 202110334035A CN 112984017 A CN112984017 A CN 112984017A
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- aluminum alloy
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- energy absorption
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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
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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
- F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure
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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
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0208—Alloys
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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
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0225—Cellular, e.g. microcellular foam
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Abstract
The invention discloses a bionic multistage energy absorption structure and a preparation method thereof, wherein the method comprises the steps of sequentially nesting aluminum alloy thin-wall tubes with different thicknesses according to the sequence of diameters from small to large so as to obtain a concentric aluminum alloy thin-wall tube combination; and filling foamed aluminum with different densities in different cavities of the concentric aluminum alloy thin-walled tube combination to obtain the bionic multistage energy absorption structure. According to the bionic multistage energy absorption structure provided by the invention, three foamed aluminum materials with different densities are respectively filled into the three concentric aluminum alloy thin-wall tubes, and the interaction between the foamed aluminum materials and the aluminum alloy thin-wall tubes is utilized, so that the gap between the foamed aluminum and the tube walls is reduced, the yield stress of the energy absorption component is increased, and the energy absorption effect of the structure is improved.
Description
Technical Field
The invention relates to the technical field of energy-absorbing materials, in particular to a bionic multistage energy-absorbing structure and a preparation method thereof.
Background
With the continuous progress of science and technology, more and more vehicles advance into the lives of people, but meanwhile, casualties and property loss caused by traffic accidents are high. In order to reduce the damage caused by traffic accidents, the design of a light energy-absorbing structure with excellent anti-collision performance is always an important point of attention.
Among them, the aluminum alloy material is light, cheap, easy to manufacture, and widely used in energy-absorbing structure design. Meanwhile, the tubular structure is convenient to process and simple in structure, and can absorb or dissipate external impact energy through self deformation, so that the aluminum alloy thin-wall tube is an energy-absorbing member with excellent performance and has the characteristics of high specific rigidity and high specific strength. However, the existing aluminum alloy thin-wall pipe is easy to deform under the action of external force, the mode is unstable, euler buckling is easy to occur, the energy absorption efficiency is further reduced, and the protection effect is limited.
Disclosure of Invention
The invention aims to provide a bionic multistage energy absorption structure and a preparation method thereof, and aims to solve the problems that an aluminum alloy thin-walled tube in the prior art is easy to deform under the action of external force, the mode is unstable, Euler buckling is easy to occur, the energy absorption efficiency is reduced, and the protection effect is limited.
In order to overcome the defects in the prior art, the invention provides a preparation method of a bionic multistage energy absorption structure, which comprises the following steps:
sequentially nesting aluminum alloy thin-wall pipes with different thicknesses according to the sequence of diameters from small to large to obtain a concentric aluminum alloy thin-wall pipe combination;
and filling foamed aluminum with different densities in different cavities of the concentric aluminum alloy thin-walled tube combination to obtain the bionic multistage energy absorption structure.
Further, in the concentric aluminum alloy thin-wall pipe combination, the diameters of the aluminum alloy thin-wall pipes from inside to outside are 20cm, 40cm and 60cm in sequence.
Further, in the concentric aluminum alloy thin-wall pipe combination, the thicknesses of the aluminum alloy thin-wall pipes from inside to outside are 1mm, 1cm and 1.5cm in sequence.
Further, according to the concentric aluminum alloy thin-wall pipe combination, the density of the foamed aluminum filled in the cavity from inside to outside is 250kg/m in sequence3、400kg/m3And 550kg/m3。
Further, according to the concentric aluminum alloy thin-wall pipe combination, the diameters of the foamed aluminum filled in the cavity from inside to outside are 18cm, 38cm and 57cm in sequence.
Further, the foamed aluminum with different densities is filled into the cavity by using a mechanical friction method.
Further, the aluminum alloy thin-wall pipes with different thicknesses have the same height as the foamed aluminum with different densities, and the height is 60 cm.
Further, the aluminum alloy thin-wall pipe is AL-6063-T5.
Further, the foamed aluminum is AL-6063-T5.
The invention also provides a bionic multistage energy absorption structure which is prepared by adopting the method.
Compared with the prior art, the invention has the beneficial effects that:
the foamed aluminum material adopted by the invention has the characteristics of small density and good buffering and energy absorption properties, the aluminum alloy thin-walled tube has excellent energy absorption, the mutual constraint and friction between the foamed aluminum material and the aluminum alloy thin-walled tube effectively reduce the deformation of the structure when the structure is impacted, stabilize the energy absorption process of the structure, greatly improve the energy absorption effect and ensure the safety performance of the structure.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for manufacturing a biomimetic multi-stage energy absorbing structure according to an embodiment of the present disclosure;
FIG. 2 is an elevation view of a biomimetic, multi-level energy absorbing structure provided in accordance with an embodiment of the present invention;
FIG. 3 is a top view of a biomimetic, multi-level energy absorbing structure provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a universal tester provided in an embodiment of the present invention;
fig. 5 is a force-displacement curve diagram of the bionic multi-stage energy absorption structure test piece provided by one embodiment of the invention in a static compression process.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a method for manufacturing a bionic multistage energy absorption structure 9, including:
s10, sequentially nesting the aluminum alloy thin-wall pipes with different thicknesses according to the sequence of the diameters from small to large to obtain a concentric aluminum alloy thin-wall pipe combination;
s20, filling foamed aluminum with different densities in different cavities of the concentric aluminum alloy thin-walled tube combination to obtain the bionic multistage energy absorption structure 9.
As shown in FIG. 2, FIG. 2 provides a bionic multistage energy absorption structure 9 prepared by the method provided in this embodiment, the structural raw material is Al-6063-T5 type aluminum alloy, and it should be noted that Al-6063-T5 refers to the state of cooling the aluminum alloy in the high-temperature formed ancient city for artificial aging. The method is suitable for aluminum alloy products which are formed and cooled at high temperature and do not undergo cold processing (straightening, leveling and no influence on mechanical properties) and artificial aging. In the embodiment, the aluminum alloy of the type is adopted for both the aluminum alloy thin-wall tube and the foamed aluminum.
Further, the structure comprises three concentric aluminum alloy thin-wall tubes, namely an inner wall 4, a middle wall 5 and an outer wall 6; meanwhile, three kinds of foamed aluminum with different densities, namely inner foamed aluminum 1, middle foamed aluminum 2 and outer foamed aluminum 3, are filled in the cavity between the inner walls.
Further, the diameters of the three concentric aluminum alloy thin-wall tubes are 20cm, 40cm and 60cm from inside to outside in sequence, the wall thicknesses of the inner wall 4, the middle wall 5 and the outer wall 6 are 1mm, 1cm and 1.5cm in sequence, and the heights are 60 cm; in the foamed aluminum material, the densities of the inner foamed aluminum 1, the middle foamed aluminum 2 and the outer foamed aluminum 3 are respectively: 250kg/m3、400kg/m3And 550kg/m3. Then, the foamed aluminum materials of different densities were cut into cylinders, the diameter of the inner foamed aluminum 1 was 18cm, the diameter of the middle foamed aluminum 2 was 38cm, and the diameter of the outer foamed aluminum 3 was 57cm, and the heights were 60 cm. As shown in fig. 3, the cylindrical foamed aluminum material is sequentially filled into the concentric thin-walled tube by a mechanical friction method, so that the foamed aluminum is in close contact with the tube wall, the stress transfer efficiency is increased, and finally, after the foamed aluminum is filled, the bionic multistage energy absorption structure 9 is obtained.
The foamed aluminum material adopted by the embodiment of the invention has the characteristics of small density and good buffering and energy absorption performance, the aluminum alloy thin-wall pipe has excellent energy absorption performance, the mutual constraint and friction between the foamed aluminum material and the aluminum alloy thin-wall pipe effectively reduce the deformation of the structure when the structure is impacted, stabilize the energy absorption process of the structure, greatly improve the energy absorption effect and ensure the safety performance of the structure.
Referring to fig. 4, in one embodiment, a quasi-static compression test of the energy absorbing structure is completed by using a universal testing machine, and first, a bionic multistage energy absorbing structure 9 (energy absorbing test piece) is placed between an upper pressure plate 8 and a lower pressure plate 10 of an experimental platform, the lower pressure plate 10 is placed on a bearing platform 11 and is in a static state, and the upper pressure plate 8 moves downward at a speed of 3 mm/min. The energy absorption test piece gradually deforms along with the increase of the compression test time, and is finally compressed into a regular multistage circular ring shape under the action of the pressure head 7.
Referring to fig. 5, in one embodiment, a force-displacement curve of the energy-absorbing test piece during static compression is provided, and as can be seen from fig. 4, three force peaks continuously appear during the compression test of the test piece, which indicates that the compression failure of the test piece is a graded failure mode. Compared with a diamond destruction mode (petal destruction) of a single-wall metal thin pipe in the test, after the foamed aluminum is added into the thin-wall pipe, the foamed aluminum supports the pipe wall from the inside and resists partial buckling of the pipe wall; the pipe wall can limit the collapse of the foamed aluminum and relieve the instability of the foamed aluminum; the foamed aluminum and the thin-walled tube have good interaction, so that the defects of the foamed aluminum and the thin-walled tube are overcome, the damage mode of the whole energy-absorbing structure is a more regular multistage circular ring mode, the deformation of the energy-absorbing structure when being impacted is effectively reduced, the energy-absorbing process of the structure is stabilized, the energy-absorbing effect is greatly improved, and the safety performance of the structure is ensured.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of a bionic multistage energy absorption structure is characterized by comprising the following steps:
sequentially nesting aluminum alloy thin-wall pipes with different thicknesses according to the sequence of diameters from small to large to obtain a concentric aluminum alloy thin-wall pipe combination;
and filling foamed aluminum with different densities in different cavities of the concentric aluminum alloy thin-walled tube combination to obtain the bionic multistage energy absorption structure.
2. The preparation method of the bionic multistage energy absorption structure according to claim 1, wherein in the concentric aluminum alloy thin-wall tube combination, the diameters of the aluminum alloy thin-wall tubes from inside to outside are 20cm, 40cm and 60cm in sequence.
3. The preparation method of the bionic multistage energy absorption structure according to claim 1, wherein in the concentric aluminum alloy thin-wall tube combination, the thicknesses of the aluminum alloy thin-wall tubes from inside to outside are 1mm, 1cm and 1.5cm in sequence.
4. The method for preparing a bionic multistage energy absorbing structure according to claim 1, wherein the density of the foamed aluminum filled in the cavity from inside to outside is 250kg/m in sequence according to the concentric aluminum alloy thin-walled tube combination3、400kg/m3And 550kg/m3。
5. The method for preparing a bionic multistage energy absorbing structure according to claim 1, wherein according to the concentric aluminum alloy thin-walled tube combination, the diameters of the foamed aluminum filled in the cavities from inside to outside are 18cm, 38cm and 57cm in sequence.
6. The method of claim 1, wherein the foamed aluminum having different densities is filled into the cavity by a mechanical friction process.
7. The method for preparing the bionic multistage energy absorption structure according to claim 1, wherein the aluminum alloy thin-wall tubes with different thicknesses are as high as the foamed aluminum with different densities and have a height of 60 cm.
8. The method for preparing a bionic multistage energy absorbing structure according to any one of claims 1 to 7, wherein the aluminum alloy thin-walled tube is of the type AL-6063-T5.
9. The method for preparing a biomimetic multistage energy absorbing structure according to any one of claims 1-7, wherein the foamed aluminum is of type AL-6063-T5.
10. A biomimetic, multistage energy-absorbing structure, prepared by the method of any of claims 1-9.
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| CN202110334035.9A CN112984017A (en) | 2021-03-29 | 2021-03-29 | Bionic multistage energy absorption structure and preparation method thereof |
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| CN202110334035.9A CN112984017A (en) | 2021-03-29 | 2021-03-29 | Bionic multistage energy absorption structure and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100040815A1 (en) * | 2008-08-13 | 2010-02-18 | The Penn State Research Foundation | Energy Absorbing Stitch Ripping Composite Tubes Containing Collapsible Cells |
| CN102537644A (en) * | 2012-02-21 | 2012-07-04 | 湖南大学 | Porous material filling double-layer tube |
| CN104372758A (en) * | 2014-11-24 | 2015-02-25 | 南京工业大学 | Light high-efficiency composite buffering collision-reducing device |
| WO2017034501A1 (en) * | 2015-08-21 | 2017-03-02 | Istanbul Teknik Universitesi Rektorlugu | Nested crash box as a passive safety component in vehicles |
-
2021
- 2021-03-29 CN CN202110334035.9A patent/CN112984017A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100040815A1 (en) * | 2008-08-13 | 2010-02-18 | The Penn State Research Foundation | Energy Absorbing Stitch Ripping Composite Tubes Containing Collapsible Cells |
| CN102537644A (en) * | 2012-02-21 | 2012-07-04 | 湖南大学 | Porous material filling double-layer tube |
| CN104372758A (en) * | 2014-11-24 | 2015-02-25 | 南京工业大学 | Light high-efficiency composite buffering collision-reducing device |
| WO2017034501A1 (en) * | 2015-08-21 | 2017-03-02 | Istanbul Teknik Universitesi Rektorlugu | Nested crash box as a passive safety component in vehicles |
Non-Patent Citations (1)
| Title |
|---|
| 邹世淼: "仿生多密度梯度泡沫填充结构的能量吸收", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》 * |
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