爆轰自增强弹塑性动力分析

用Hopkinson拉、压杆装置测试了43CrNi2MoVA钢的动态力学性能,根据该材质的动态本构关系及爆轰冲击波压力曲线对厚壁圆筒的爆轰自增强过程进行了非线性动态有限元分析,得到了各部位在不同爆轰冲击压力下的应力、位移、速度等随时间的变化规律及塑性变形区尺寸。最后,用Sachs内层逐次剥层法对爆轰后所产生的残余应力进行了测定,并对爆轰法和静液压法自增强所形成的残余应力进行了对比分析。

ELASTO-PLASTICAL DYNAMIC ANALYSIS OF EXPLOSIVE AUTOFRETTAGE

Based on the explosive pressure curve, dynamic mechanical property and constructive relationship of 43CrNiZMoVA steel which were tested with Hopkinsion bar equipment, the explosive autofrettage of thick - wall cylinder with nonlinear finite element method was analyzed in this paper. Under different explosive pressure, the change rule of the stress, displacement,velocity of different position and the size of plastical zone versus the time were obtained. Finally, the residual stress resulted in explosive autofrettage with Sachs method was measured, and the residual stresses of explosive autofrettage were compared with that of hydrostatic pressure.