Studies of Dynamic Damage Behavior in LY12 Aluminum Alloy under the Condition of High Loading Rate
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摘要: 本文以球形实体中含有一球形空穴为基本单元，通过分析单元的受力状态，推导出了一个韧性介质空穴增长模型。模型中考虑了介质的硬化，应变率效应，同时还考虑了惯性效应。在考虑空穴成核效应时，采用了热激活成核机制。对LY12铝合金进行了二维层裂实验，采用本文提出的动态损伤模型，借助于二维Lagrange弹塑性流动有限差分程序对二维层裂实验进行了数值模拟，计算结果与实验吻合较好。Abstract: A new ductile dynamic failure model, based on a porous element consisting of a single spherical void of radius a in a sphere of radius b subjected to internal pressure pg and external stress r=-p+(-1)pg is developed in this paper. Work-hardening, rate-dependent contribution and inertial effects are considered in the model. Stress controlling mechanism is adopted while considering the contribution of void nucleation to rate of porosity . The mathematical model presented here is incorporated in a hydrodynamic two dimensional finite-difference computer code, to simulate two dimensional spallation of LY12 aluminum alloy. Comparison of numerical calculation with experimental results shows that the model described the process of spall experiment successfully. The future improvement of the model is discussed.
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