CN104276113A - Impact energy absorbing device with controllable crushing process - Google Patents
Impact energy absorbing device with controllable crushing process Download PDFInfo
- Publication number
- CN104276113A CN104276113A CN201410344913.5A CN201410344913A CN104276113A CN 104276113 A CN104276113 A CN 104276113A CN 201410344913 A CN201410344913 A CN 201410344913A CN 104276113 A CN104276113 A CN 104276113A
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- CN
- China
- Prior art keywords
- crushing force
- energy absorbing
- cylinder
- relative density
- absorbing device
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
The invention relates to an impact energy absorbing device with controllable crushing process. The impact energy absorbing device comprises four layers of filling materials, wherein the filling materials are arranged along the direction of length L of a thin wall cylinder, the relative densities of the filling materials from top to bottom are rou1, rou2, rou3 and rou4, the magnitude of the average crushing force of each section is determined by the relative densities rou1, rou2, rou3 and rou4 and the cylinder diameter D, cylinder wall thickness h and cylinder length L of the cylinder, and the magnitude of the crushing force is proportional to the relative densities. The impact energy absorbing device has the advantages that the average crushing force of each section is integrated to obtain the integral crushing force process, so the integral crushing force process can be accurately adjusted and controlled; the energy absorbing device manufactured by such a method has the function of adjustable crushing force process, and better stability while the asymmetric impact is borne, so as to certainly avoid the Euler buckling, and improve the specific energy absorbing capability of the structure.
Description
Technical field
The present invention relates to collision energy-absorbing safety protection field, be specifically related to the impact energy absorber that a kind of conquassation course is controlled.
Background technology
Along with the development of the vehicle such as automobile, high speed train and improving constantly of running velocity, its crash survivability more and more receives the concern of people, because collision case can cause great personal injury and property damage, the problem must considered when collision problem has become the structure design such as automobile, high speed train.In addition, the trend of light-weight design requires collision energy-absorbing device efficient light more.Because metal thin-walled cylinder generally has stable progressive failure model under axial compression, absorb considerable energy by plastic buckling, and containing a large amount of thin-wall constructions in vehicle body, therefore traditional endergonic structure generally selects thin-wall metal cylinder.The ratio energy absorption ability of thin circular cylinder is higher and cost of manufacture is lower, is thus subject to applying the most widely.Through reasonably design, thin circular cylinder has controollable failure mode, comparatively pulsation-free crush loads, and be a kind of useful buffer structure, then, the ability that simple thin circular cylinder bears expense axial load is more weak, easily Euler's buckling occurs, and causes energy-absorbing insufficient.
The light porous material received much concern in recent years, as foamed aluminium, honeycomb etc., because its quality is light, platform crushing force is very steady, is beneficial to pulsation-free energy-absorbing.And aerated materials is combined with thin-wall construction, can obtain satisfied energy-absorbing effect, due to coupling effect, the energy absorbing of interstitital texture is much larger than aerated materials and the independent separately energy absorbing sum of thin wall cylinder.The introducing of packing material can also improve the stability of thin-wall construction, reduces the possibility of thin wall cylinder generation Euler's buckling, thus ensures the energy absorption ability of structure.
Forefathers have carried out large quantifier elimination for thin circular cylinder, for the dynamic progressive buckling under impact loading, obtain the theoretical formula of the average crushing force of its different distortion pattern (annulus pattern, diamond pattern); For foamed materials, also by the strain-stress relation of different relative density material that a large amount of experimental study and theory deduction obtain.For interstitital texture, by theory deduction and laboratory facilities, consider the energy-absorbing effect that foamed materials and thin-walled sky both cylinders are independent and the interaction of the two simultaneously, obtain average crushing force formula.But for the crushing force course of interstitital texture, not yet appear and hold accurately.
Summary of the invention
Given this, the object of this invention is to provide the impact energy absorber that a kind of conquassation course is controlled, in order to solve the technical matters existed in above-mentioned prior art.
The invention provides the impact energy absorber that a kind of conquassation course is controlled, shown device comprises the four layers of packing material arranged along thin circular cylinder length L direction, and the relative density of packing material is followed successively by ρ from top to bottom
1-ρ
4, described relative density ρ
1-ρ
4jointly decide the size of each section of average crushing force with barrel sizes drum diameter D, wall thickness of cylinder h, drum length L, size and the relative density of crushing force are proportional.
Further, as required, can increase or reduce the quantity of described unit endergonic structure.
Further, described relative density ρ
1-ρ
4magnitude relationship be ρ
1< ρ
2< ρ
3< ρ
4.
Further, as required, L can be regulated
1-L
4size.
The present invention compared with prior art has obvious advantage and beneficial effect.Specifically, the present invention is by filling the foamed materials of different relative density and cell element size at the inner diverse location of thin circular cylinder, effectively can control conquassation initial point lower section of material relative density, simultaneously, the average crushing force of each section can be carried out integrating the crushing force course obtaining overall segmentation, thus the fine adjustment realized overall crushing force course and control, the energy absorption device manufactured in this approach not only has the adjustable function of crushing force course, when bearing asymmetric shock, there is good stability simultaneously, the situation of Euler's buckling is avoided to occur to a certain extent, the ratio energy absorption ability of structure can also be improved.
Accompanying drawing explanation
Fig. 1 is the controlled impact energy absorber schematic diagram of conquassation course.
Wherein: D: drum diameter, L: drum length, h: wall thickness of cylinder.
Detailed description of the invention
Elaborate below in conjunction with the detailed description of the invention of accompanying drawing to the controlled impact energy absorber of conquassation course provided by the invention.
Utilize the packing material of different relative density can cause the theory of the flexing crushing force of different size, the present invention is provided with the packing material of the different relative density along tube length direction.As shown in Figure 1, the relative density of packing material is followed successively by ρ from top to bottom
1-ρ
4.In practice, according to the concrete needs that crushing force regulates, more how different relative density materials can be set.
The different relative densitys of packing material accurately can control the flexing platform crushing force of every part, relative density ρ
1-ρ
4jointly decide the size of each section of average crushing force with barrel sizes drum diameter D, wall thickness of cylinder h, drum length L, size and the relative density of crushing force are proportional.Then can according to the demand for control to crushing force, by upper end, arrange relative density is ρ
1-ρ
4packing material, each several part length is respectively L
1-L
4.Wherein ρ
1-ρ
4, L
1-L
4be regulatable parameter.
If the pass between relative density is ρ
1< ρ
2< ρ
3< ρ
4, then flexing is from the minimum ρ of density
1end starts to carry out, progressively to the lower end development that relative density is high.Can find out thus, this programme can by arranging that the packing material of different relative density controls buckling development process.
The platform crushing force of each several part all can be drawn by theoretical formula method, and therefore for the packing material of the different relative density of arranging multiplayer, segmentation can calculate its platform crushing force of acquisition, overall crushing force course just can be obtained by each section of set.Described theoretical formula is:
Wherein r is circular cylinder radius, and t is wall thickness of cylinder, σ
0for the yield strength of cylinder material,
for immediate strain rate, D, n are the Cowper-symonds equation coefficient that material is relevant.σ
sfor the yield strength of foamed materials,
material content between characterization of foam thin-walled, ρ
nfor the relative density of foamed materials,
for rate of strain during foamed materials quasistatic compression,
for the rate of strain of foam under certain rate of load application.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the impact energy absorber that conquassation course is controlled, shown device comprises the four layers of packing material arranged along thin circular cylinder length L direction, and the relative density of packing material is followed successively by ρ from top to bottom
1-ρ
4, described relative density ρ
1-ρ
4jointly decide the size of each section of average crushing force with barrel sizes drum diameter D, wall thickness of cylinder h, drum length L, size and the relative density of crushing force are proportional.
2. device according to claim 1, is characterized in that, as required, can increase or reduce the quantity of described unit endergonic structure.
3. device according to claim 1 and 2, is characterized in that, described relative density ρ
1-ρ
4magnitude relationship be ρ
1< ρ
2< ρ
3< ρ
4.
4. device according to claim 1 and 2, is characterized in that, as required, can regulate L
1-L
4size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410344913.5A CN104276113A (en) | 2014-07-18 | 2014-07-18 | Impact energy absorbing device with controllable crushing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410344913.5A CN104276113A (en) | 2014-07-18 | 2014-07-18 | Impact energy absorbing device with controllable crushing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104276113A true CN104276113A (en) | 2015-01-14 |
Family
ID=52251611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410344913.5A Pending CN104276113A (en) | 2014-07-18 | 2014-07-18 | Impact energy absorbing device with controllable crushing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104276113A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725497A (en) * | 2018-06-04 | 2018-11-02 | 哈尔滨理工大学 | A kind of multiple tube of axial strength gradual change |
| CN112124605A (en) * | 2020-09-23 | 2020-12-25 | 上海交通大学 | Inward-turning composite material tubular efficient energy absorber containing filler |
| CN114450503A (en) * | 2019-08-07 | 2022-05-06 | 思瑞史密斯集团有限公司 | Single structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0947727A1 (en) * | 1998-03-13 | 1999-10-06 | Dynamit Nobel Kunststoff GmbH | Energy absorbing foam structure |
| CN201100355Y (en) * | 2007-07-17 | 2008-08-13 | 东南大学 | An energy absorber for filling heterogeneous foam aluminum and aluminum alloy |
| CN101251227A (en) * | 2007-02-23 | 2008-08-27 | 辽宁科技大学 | Metallic honeycomb sandwich assembly energy-absorbing construction material and manufacture method thereof |
| CN102414049A (en) * | 2009-05-14 | 2012-04-11 | 株式会社神户制钢所 | Bumper structure |
| CN102700488A (en) * | 2012-06-12 | 2012-10-03 | 湖南大学 | Buffering energy-absorbing structure |
-
2014
- 2014-07-18 CN CN201410344913.5A patent/CN104276113A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0947727A1 (en) * | 1998-03-13 | 1999-10-06 | Dynamit Nobel Kunststoff GmbH | Energy absorbing foam structure |
| CN101251227A (en) * | 2007-02-23 | 2008-08-27 | 辽宁科技大学 | Metallic honeycomb sandwich assembly energy-absorbing construction material and manufacture method thereof |
| CN201100355Y (en) * | 2007-07-17 | 2008-08-13 | 东南大学 | An energy absorber for filling heterogeneous foam aluminum and aluminum alloy |
| CN102414049A (en) * | 2009-05-14 | 2012-04-11 | 株式会社神户制钢所 | Bumper structure |
| CN102700488A (en) * | 2012-06-12 | 2012-10-03 | 湖南大学 | Buffering energy-absorbing structure |
Non-Patent Citations (2)
| Title |
|---|
| A.G.HANSSEN,M.LANGSETH: "Static and dynamic crushing of circular aluminum extrusiongs with aluminum foam filler", 《INTERNATIONAL JOURNAL OF IMPACT ENGINEERING》, vol. 24, 31 December 2000 (2000-12-31), pages 475 - 507 * |
| 麦福荣，赵洪伦: "轨道车辆泡沫铝填充吸能元件的优化设计", 《轨道车辆泡沫铝填充吸能元件的优化设计》, vol. 12, 31 March 2009 (2009-03-31), pages 12 - 16 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108725497A (en) * | 2018-06-04 | 2018-11-02 | 哈尔滨理工大学 | A kind of multiple tube of axial strength gradual change |
| CN114450503A (en) * | 2019-08-07 | 2022-05-06 | 思瑞史密斯集团有限公司 | Single structure |
| CN112124605A (en) * | 2020-09-23 | 2020-12-25 | 上海交通大学 | Inward-turning composite material tubular efficient energy absorber containing filler |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150114 |