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将多晶材料中晶片之间与晶粒界面上的滑移作为消耗塑性功的主要物理机制,提出一个由亚宏观滑移系作为耗能构元的材料模型,并用功共轭方法得到了亚宏观滑移系的等效滑移剪切率。重新给出了滑移系自身运动硬化、潜在硬化及Bauscninger效应的力学描述,导出了本构方程。在探讨材料性质参数对后继屈服面形状及尺寸变化影响的基础上,论述了模型的基本性质。与以晶粒为基本构元的多晶体自洽理论比较,所得到的本构方程具有简洁的数学表达,而且能精确有效地预测多晶金属材料在复杂加载条件下的宏观弹塑性力学行为。
Based on the slip between the wafers and the grain boundary in the polycrystalline material as the main physical mechanism for plastic work, a submachine slip system is proposed as a material model of energy dissipation structure. The equivalent slip shear rate of macro slip system. The mechanical description of the kinematic hardening, latent hardening and Bauscninger effect of the slip system is given again. The constitutive equation is derived. On the basis of discussing the influence of material property parameters on the shape and size change of subsequent yield surface, the basic properties of the model are discussed. Compared with the theory of self-consistent polycrystal with grain as basic element, the constitutive equation obtained has a simple mathematical expression, and can accurately and effectively predict the macroscopic elastoplastic behavior of polycrystalline metallic materials under complex loading conditions.