中文摘要：

为分析固体材料的准等熵压缩实验数据，引入了率相关本构方程和流体弹塑性模型，建立了考虑材料强度效应的反积分数据处理方法。利用CQ-1．5磁压驱动装置中多晶钽的准等熵压缩实验数据，对钽的屈服强度和流应力进行了反积分数值模拟和分析，计算了钽的拉格朗日声速和应变率分布情况。得到了钽在准等熵压缩过程中样品内部及加载面上压力和速度的分布及演变规律，获得了30GPa压力下钽的准等熵屈服强度约为1．85GPa，准等熵弹性屈服极限约为2．9GPa。此外，计算得到了与Sandia实验室数据高度吻合的应力一应变曲线和准等熵P—V参考线。

英文摘要：

For analyzing the quasi-isentropic compression experimental data of solid materials, a backward integration method with strength effect is presented based on rate-dependent constitutive equation and fluid elastic-plastic model. From the quasi-isentropic compression data of tantalum on CQ-1.5 with a loading time of 700 ns,the yield strength,deviatoric stress and interior information of the tantalum sample are calculated. Moreover,the Lagrangian sound speed and strain rate are also analyzed. As a result, the driving history and stress distribution of the tantalum sample are obtained. It is found that the yield strength of 1.85 GPa corresponds to the peak stress （30 GPa） with strain rates of 105 s-1 , and the isentropie elastic limit is about 2. 9 GPa. Numerical results show that the calculated stressstrain and pressure-volume curves appear to be in good agreement with the experimental data from Sandia National Laboratory.