摘要
以经典热粘塑性本构关系 (John Cook本构关系和Powerlaw本构关系 )为基础 ,建立了更适当表征材料特征的新的、解耦的本构关系。采用SHPB(分离式霍普金森杆 )技术测定了常用弹箭材料 35CrMnSiA的不同应变率下的应力、应变关系 ,并采用拟合的方法确定了本构方程中的材料常数。与高速摄影技术测得的径向位移函数及圆筒材料的损伤演化方程相结合 ,建立了控制内爆炸加载圆筒膨胀 ,直至破裂的完备方程组 ,完成了内爆炸加载圆筒问题的数值模拟 ,计算结果与以往有关箭弹材料圆筒膨胀的实验结果符合较好。
Based on the classical thermo-viscoplastic constitutive relations, a new and uncoupled constitutive relation was proposed, which can describe the thermal softening, work hardening and strain rate hardening effects more exactly. For 35CrMnSiA steel, using Hopkinson bar stress-strain were measured under different high strain rates and the constants for the new constitutive equation were fitted. Combined with FENG Jia-po's damage evolution equation, the radial expand history and the radial profile function, a self-contained governing equation system was established, with which the expanding and fracture problem of a cylindrical tube under inside-explosive loading was computed. A satisfactory agreement between the computation and the experiments is obtained.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2003年第4期305-308,共4页
Explosion and Shock Waves
