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对金属铈低压冲击γ→α相变进行了数值模拟研究.冲击加载实验的速度剖面结果表明,铈的低压相变过程中两相之间的转换较为光滑,无明显间断,其相变过程存在动态因素.通过分析金属铈低压冲击加载和卸载下的典型物理过程,对材料本构关系、Hugoniot关系和相变与逆相变过程进行了理论研究.获取了铈低压相变前后的本构关系及状态方程,并建立了非平衡相变理论模型.数值计算结果与平面冲击实验符合较好,表明该相变动态模型能够较好地描述铈的低压冲击加载和卸载过程.
The numerical simulation of low-pressure impact cerium cerium γ → α phase transformation was carried out.The velocity profile of the impact loading experiment showed that the transition between the two phases in cerium low-pressure phase transition was smooth and without obvious discontinuity, and the phase transition existed Dynamic factors.Studies on the constitutive relations, Hugoniot relationship and phase transformation and reverse phase transformation process of the material by analyzing the typical physical process under low pressure impact loading and unloading of cerium metal.Constructed the constitutive relations And the equation of state, and established a non-equilibrium phase transition theory model.The numerical results are in good agreement with the plane impact test, indicating that the phase change dynamic model can better describe the low pressure impact loading and unloading process of cerium.