Modeling Effects of Crystalline Microstructure, Energy Storage Mechanisms, and Residual Volume Changes on Penetration Resistance of Precipitate-Hardened Aluminum Alloys
Modeling Effects of Crystalline Microstructure, Energy Storage Mechanisms, and Residual Volume Changes on Penetration Resistance of Precipitate-Hardened Aluminum Alloys
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DOI：
10.1016/j.compositesb.2009.01.009
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发表时间：
2009-09
影响因子：
13.1
通讯作者：
J. Clayton
中科院分区：
文献类型：
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作者：
J. Clayton
建立了一类延性铝合金的各向异性非线性晶体力学模型，旨在将合金的微观特征和性能与在冲击和爆炸事件中可能产生的高应变率变形的合金的性能联系起来。对铝多晶动态拉伸变形的直接数值模拟表明，在残余（即存储）弹性能与塑性耗散之比最小的微结构区域，剪切局部化倾向发生。采用Taylor平均法对晶体塑性框架进行粗粒化预测，建立了宏观本构模型，研究了微观组织对Al-Cu-Mg-Ag合金板材抗弹道穿孔性能的影响。微观结构研究的具体方面包括随机和轧制立方织构，以及与金属基复合材料中晶格缺陷、杂质和夹杂物（如第二相）相关的存储弹性能和残余体积变化。结果表明，可以通过调整微观结构来提高抗剪屈服强度和残余弹性能与散热量的比值来改善性能。
An anisotropic nonlinear crystal mechanics model is developed for a class of ductile aluminum alloys, with the intent of relating microscopic features and properties to performance of the alloys deformed at high strain rates that may arise during impact and blast events. A direct numerical simulation of dynamic tensile deformation of an aluminum polycrystal demonstrates a tendency for shear localization to occur in regions of the microstructure where the ratio of the rate of residual (i.e., stored) elastic energy to plastic dissipation is minimal. By coarse-graining predictions of the crystal plasticity framework using a Taylor averaging scheme, a macroscopic constitutive model is developed to investigate effects of microstructure on ballistic perforation resistance of plates of an Al–Cu–Mg–Ag alloy. Specific aspects of microstructure investigated include random and rolled cubic textures as well as stored elastic energy and residual volume changes associated with lattice defects, impurities, and inclusions such as second phases in the metal–matrix composite. Results suggest performance could be improved by tailoring microstructures to increase the shear yield strength and the ratio of residual elastic energy to dissipated heat.