高温、高压、高应变速率动态过程晶体塑性有限元理论模型及其应用

Crystal Plasticity Finite Element Theoretical Models and Applications for High Temperature,High Pressure and High Strain-Rate Dynamic Process

对于高温、高压、高应变速率加载条件下的材料冲击变形行为,动态晶体塑性模型能够直接反映晶体中塑性滑移的各向异性及其对温度、压力和微观组织结构的依赖性,因而广泛应用于材料的动态冲击力学响应、微观结构演化以及动态损伤破坏的模拟。本文综述了高压冲击下动态晶体塑性有限元的理论模型,主要包括变形运动学、包含状态方程的超弹性本构模型和晶体塑性本构模型,涉及位错滑移、相变、孪生等塑性变形机制,以及层裂、绝热剪切带等动态破坏方式。

For shock deformation behavior of materials under high temperature,high pressure and high strain-rate loading conditions,dynamic crystal plasticity models can directly reflect the anisotropy of plastic slip and its dependence of temperature,pressure and microstructure in crystals.In consequence,dynamic crystal plasticity models are widely used in simulations of material impact dynamic response,microstructure evolution and dynamic damage.Theoretical models of dynamic crystal plasticity under high pressure shock loading conditions were reviewed in this paper,mainly including:deformation kinetics,hyperelastic constitutive models incorporating equations of state,and crystal plasticity constitutive models.This paper also covers plastic deformation mechanisms,including dislocation slip,phase transition and twinning;as well as dynamic damage,including spalling and adiabatic shear band.