诱导槽参数对泡沫铝填充吸能盒的碰撞吸能特性的影响
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摘要
运用LS-DYNA对侧壁开有诱导槽的泡沫铝填充的吸能盒进行碰撞冲击过程的有限元分析,研究诱导槽参数对吸能盒吸能特性的影响。将结果导入到LS-Prepost中进行后处理,考虑吸能量、碰撞力峰值、平均碰撞力、比吸能、压缩力效率综合性能,得出在吸能盒侧壁上部50%位置均匀开两个半径为2.5 mm的半圆形诱导槽时,在碰撞冲击过程中呈现较为理想的对称叠缩式变形,保证吸能量的同时降低了碰撞力峰值,且有更高的比吸能和压缩力效率。通过立卧两用式液压冲击试验台对吸能盒实体进行碰撞冲击试验,验证了有限元模拟碰撞冲击过程的可行性。
The foamed aluminum filled crash-box with induction grooves on the side wall was made finite element analysis in the impact process by LS-DYNA,and the parameters influence of induction grooves on the energy absorption characteristics of crash-box was studied. The results was dealt with the LS-Prepost, considering the energy absorption, peak impact force, the average impact force and energy absorption ratio, when crash-box was made two radius of 2.5 mm semicircle grooves in the upper 50% part of the side wall, in the impact process of a symmetrical stack the ideal type of shrinkage deformation, depressed peak impact force without affecting energy absorption, higher energy absorption ratio and compression efficiency wound be gotten. The finite element simulation of the impact process was feasible when the crash-box body was made the impact test by the vertical and horizontal hydraulic impact test platform.
The foamed aluminum filled crash-box with induction grooves on the side wall was made finite element analysis in the impact process by LS-DYNA,and the parameters influence of induction grooves on the energy absorption characteristics of crash-box was studied. The results was dealt with the LS-Prepost, considering the energy absorption, peak impact force, the average impact force and energy absorption ratio, when crash-box was made two radius of 2.5 mm semicircle grooves in the upper 50% part of the side wall, in the impact process of a symmetrical stack the ideal type of shrinkage deformation, depressed peak impact force without affecting energy absorption, higher energy absorption ratio and compression efficiency wound be gotten. The finite element simulation of the impact process was feasible when the crash-box body was made the impact test by the vertical and horizontal hydraulic impact test platform.
引文
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[3] 谭丽辉.参数化薄壁构件模型的耐撞性分析与优化设计[D].吉林:吉林大学,2014:31-42.TAN LiHui.Stress-worthiness Analysis and Optimization Design of Parametric Thin-walled Component Model[J].Jilin:Jilin University,2014:31-42(In Chinese).
[4] S.Santosa,T.Wierzbicki.Crash behavior of box columns filled with aluminum honeycomb or foam[J].Computers & Structures,2010,68(04):343-367.
[5] Chendh Vshijmak.Estimation of the initial peak load for circular tubes subjected to axial impact[J].Thin Walled Structures,2011,49(7):889-898.
[6] 刘春盟.泡沫铝吸能特性及其在汽车保险杠中的应用研究[D].哈尔滨:哈尔滨工业大学,2011:53-57.LIU ChunMeng.Application of aluminum foam energy and its application in automobile bumper [J].Harbin:Harbin Institute of Technology,2011:53-57(In Chinese).
[7] 兰凤崇,曾繁波,周云郊,等.闭孔泡沫铝力学特性及其在汽车碰撞吸能中的应用研究进展[J].机械工程学报,2014,50(22):97-112.LAN FengChong,ZENG FanBo,ZHOU YunQian,et al.Study on mechanical properties of closed-cell foam aluminum and its application in automobile impact energy absorption [J].Journal of Mechanical Engineering,2014,50 (22):97-112(In Chinese).
[8] 张勇,林福泳.铝泡沫填充薄壁结构耐撞可靠性优化设计[J].机械工程学报,2011,47(22):93-99.ZHANG yong,LIN FuYong.Optimization design of collision resistance of aluminum foam filled thin-walled structure [J].Journal of Mechanical Engineering,2011,47 (22):93-99(In Chinese).
[9] 万鑫铭,徐小飞,徐中明,等.汽车用铝合金吸能盒结构优化设计[J].汽车工程学报,2013,13(1):15-21.WAN XiMing,XU XiaoFei,XU ZhongMing,et al.Automotive aluminum crash box structure optimization [J] Journal of Automotive Engineering,2013,13 (1):15-21(In Chinese).
[10] 万银辉,王冠,刘志文,等.6061铝合金汽车保险杠横梁的碰撞性能[J].机械工程材料,2012,36(7):67-71.WAN YinHui,WANG Guan,LIU ZhiWen,et al.Collision Performance of 6061 aluminum alloy bumper beam [J].Mechanical Engineering Materials,2012,36 (7):67-71(In Chinese).
[11] 魏书彬,雷正保,杜青云.汽车碰撞时吸能螺纹剪切分析的网格优化[J].机械强度,2010,5(28):859-864.WEI ShuBin,LEI ZhengBao,DU QingYun.Grid optimization of energy dissipation test for automobile collision [J].Journal of Mechanical Strength,2010,5 (28):859-864(In Chinese).
[12] 黄睿,刘志芳,路国运,等.轴向压缩下泡沫铝填充薄壁圆管吸能特性研究[J].太原理工大学学报,2016,47(1):101-107.HUANG Rui,LIU ZhiFang,LU GuoYun,et al.Study on energy absorption characteristics of foamed aluminum filled thin-walled tube under axial compression [J].Journal of Taiyuan University of Technology,2016,47 (1):101-107(In Chinese).