两种晶体塑性损伤模型在有限变形条件下的比较  

COMPARISON ON TWO CRYSTAL PLASTICITY DAMAGE MODELS UNDER FINITE DEFORMATIONS

作　　者：刘美华[1] 冯露[2] 李鸿琦[2] 

机构地区：[1]天津商业大学机械学院,天津300134 [2]天津大学机械工程学院,天津300072

出　　处：《固体力学学报》2007年第4期385-388,共4页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金(10402022/A020206)资助

摘　　要：对建立在连续损伤力学和内变量理论基础上的两种晶体塑性损伤模型进行了比较,旨在比较两种模型在描述材料物理性能方面的适用性以及由加载而引起变形响应的不同之处.模拟结果显示,两种模型均能反映出塑性各向异性和损伤的演化;由加载而导致有限变形的响应不仅依赖于变形,而且也依赖于晶格取向;尽管两种模型在揭示单晶体的物理性能方面是不同的,但是在预测材料力学性能方面有着相同的预测趋势.Two crystal plasticity damage models built on continuous damage mechanics and internal state variable theory are compared with each other under large deformations Numerical results show that both the two models are able to reflect the plastic anisotropy and damage evolution. The finite deformation response caused by loading not only depend on the deformation, but also on the lattice orientation. The paper does in the first place aim at a discussion about the relevance of the physical properties described by the constitutive models. The two models differ in the consideration of the influence of damage on the constitutive behavior of single crystals. Simulation results show that the two models exist differences in disclosing the physical mechanism for single crystals hut they predict the same trend of material＇s mechanical behaviors.

关 键 词：晶体塑性模型 各向异性损伤 有限变形 本构模型 

分 类 号：O346.5[理学—固体力学]