摘要
通过数值试验分析Holmquist-Johnson-Cook(HJC),Concrete-Damage(DAM)和Kinematic-Hardening-Cap(KHC)等常用混凝土模型在侧向撞击、单轴压缩和单轴拉伸条件下的响应特征,研究各模型对碰撞情形的适应性.结果发现:对于侧撞,当撞击速度不大时,各模型所得撞击力结果基本一致;DAM模型因不能有效控制拉伸体积变形可能造成位移过大;HJC模型能较好地考虑应变率效应,预测的单轴动态压缩强度与实际强度较为符合;HJC和KHC模型没有考虑拉伸和压缩子午线的区别,HJC预测的拉应力可能严重偏离其材料强度,而KHC模型在极限状态下很容易发散,无法预测正确结果.
The numerical tests are analyzed on concrete responses of common constitutive models, such as Holmquist-Johnson-Cook （ HJC ）, Concrete-Damage （ DAM）, and Kinematic-Hardening-Cap （KHC） models under the conditions of lateral impact, is to study these concrete constitutive models＇ uni-axial tension and uni-axial compression. The purpose applicability for impact situation. The resuhs indicate： these models can be led to approximate impact forces under lateral impact without high impact speed; DAM model may yield large tensile bulk strain and probably results in large displacement; HJC model in- cludes variable strain rate enhancement effect and can predict correct dynamic uni-axial compressive strength; HJC and KHC models consider no difference between tensile and compressive meridians, HJC model may result in excessive tensile stress than strength, and KHC model tends to induce numerical divergence under extreme stress state. And the accurate result can＇t be predicted.
出处
《计算机辅助工程》
2008年第1期1-5,共5页
Computer Aided Engineering
基金
国家自然科学基金重点项目(50538050)
