诱导槽参数对泡沫铝填充吸能盒的碰撞吸能特性的影响

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。

PARAMETERS INFLUENCE OF INDUCTION GROOVES ON ENERGY ABSORPTION CHARACTERISTICS OF CRASH-BOX FILLED WITH FOAMED ALUMINUM

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.