带隔板薄壁方管的耐撞性研究  

Research on crashworthiness of thin-walled square tubes with diaphragms

作　　者：李健[1] 高广军[1] 董海鹏[1] 张洁[1] 

机构地区：[1]中南大学交通运输工程学院轨道交通安全教育部重点实验室,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2014年第7期2481-2488,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51275532);中南大学中央高校基本科研业务费专项资金资助项目(2013zzts216);高铁联合基金资助项目(U1334208)

摘　　要：基于显式有限元方法,应用LS-DYNA软件,对带隔板薄壁方管的耐撞性进行研究。研究结果表明:隔板提高了方管变形的稳定性;在准静态载荷下,初始压缩力峰值随壁厚的增加而增加,但隔板数对初始压缩力峰值的影响很小,结构的吸能量、比吸能、压缩力效率值均随壁厚和隔板数的增加而增加;Cowper-Symonds材料模型中硬化系数β对初始压缩力峰值没有影响,而吸能量随β的增加而增加,在压溃距离为600 mm时,硬化系数为1相比为0时,吸能量增加了8.97%;考虑应变率效应时,吸能量相比准静态时有显著提高,但应变率效应在低速时影响更加明显。The crashworthiness of thin-walled square tubes with diaphragms was analyzed by explicit finite element method. The results show that the tubes with diaphragms exhibit relatively stable crushing process. Under the quasi-static loads, the peak of initial compression force strengthens with the increase of the wall thickness, while the effect of the number of diaphragms on it is small. As wall thickness and diaphragm number increase, energy absorption, specific energy absorption and crush force efficiency of the structure are enlarged. The hardening coefficient in material model of Cowper-Symonds has no influence on the peak of initial compression force, but the energy absorption increases with the increase of the hardening coefficient β. Compared with β=1 and β=0, the energy absorption of structure increases by 8.97% at the crushing distance of 600 mm. Given the effect of strain rate, energy absorption compared with quasi-static situation is significantly improved. Meanwhile, at low impact speed, strain rate effect is more sensitive.

关 键 词：方管 吸能 防撞性 硬化系数 应变率效应 

分 类 号：U270[机械工程—车辆工程]