岩盐冲击过程本构关系和状态方程研究

采用Lagrange分析方法 ,对压剪联合冲击加载与单纯的压缩冲击加载下岩盐应力应变关系和状态方程进行了详细的探讨。其结果表明 ,冲击压缩过程岩盐的应力应变关系有较强的非线性和应变率效应 ,而其Hugoniot线则表明此材料有约 3 %的孔洞。由于在冲击过程中 ,岩盐因局部缺陷产生高温熔化 ,影响到剪切行为的分析 ,因此 ,未作进一步探讨。岩盐也由于这种熔化而使原始的缺陷得到了修复。

Investigation on the constitutive relationship and equation of state for rock salt under impact loading

The Lagrangian analysis method is employed in the present paper to investigate the dynamic constitutive relationship and equation of state for rock salt under impact compression and combined pressure shear impact loading. The results show that the stress-strain relationship is evidently non-linear and rate-dependent .Based on P-V Hugoniot curves, the sample is skown to be a porous material with void volume about 3 percent. With flaws in the meso scale, rock salt sample melts around these flaws during impact loading, and the transversal form of shear wave is greatly changed. Therefore, no further discussions on shear behaviors are conducted. In the process, the flaws seem to be recovered after melting.