摘要
随着汽车数量的增加和广泛使用,现代汽车工业对材料的力学性能提出了更高的要求。本工作对汽车车架用B610钢进行了不同温度下的准静态及动态压缩试验,发现B610钢承受准静态荷载时高温区域(400~600℃)内材料的温度软化效应最为明显,而当承受动态荷载时在低温区域(–80~25℃)内材料的应变率硬化效应最为明显。同时利用试验数据拟合得到了B610钢考虑温度及应变率的Johnson-Cook本构模型,对B610钢材质的车架进行了正面碰撞的数值模拟,结果表明Johnson-Cook模型计算得到的内能转化率达到92.8%,而线弹性情形仅有21.4%,等效应力峰值也降低了47%,充分说明了在汽车被动安全性研究中考虑材料温度软化效应及应变率硬化效应的重要性。
With the increase of the number of automobiles and their widespread use,the modern automobile industry has put forward higher requirements for the mechanical properties of materials.In the present paper,quasi-static and dynamic compression tests of B610 steel used in truck frame have been carried out at different temperatures.It is found that the temperature softening effect of B610 steel is the most obvious in the high temperature region(400~600℃)under quasi-static loadings,and the strain rate hardening effect is the most obvious in the low temperature region(–80~25℃)under dynamic loadings.The Johnson-Cook constitutive model of B610 steel considering temperature and strain rate was obtained by fitting the test data.The numerical simulation of front collision of B610 steel truck frame was carried out.It is found that the internal energy conversion calculated by Johnson-Cook model is 92.8%,while that of linear elasticity is only 21.4%,and the peak value of equivalent stress is also reduced by 47%.Th ese fully explain the importance of considering the temperature softening effect and strain rate hardening effect of materials in the study of vehicle passive safety.
作者
牛晓燕
耿旭琛
安明磊
李深圳
陈聪
Niu Xiaoyan;Geng Xuchen;An Minglei;Li Shenzhen;Chen Cong(College of Civil Engineering and Architecture,Hebei University,Baoding 071002,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第12期4215-4221,共7页
Rare Metal Materials and Engineering
基金
河北省自然科学基金(A2019201338)
国家自然科学基金(11502065)。
关键词
B610钢
温度软化效应
应变率硬化效应
汽车被动安全性
车架正面碰撞
B610 steel
temperature softening effect
strain rate hardening effect
vehicle passive safety
front collision of truck frame
