Comparison of Crystal Plasticity and Isotropic Hardening Predictions for Metal-Matrix Composites
Comparison of Crystal Plasticity and Isotropic Hardening Predictions for Metal-Matrix Composites
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DOI：
10.1115/1.2900781
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发表时间：
1993-03
期刊：
影响因子：
--
通讯作者：
A. Needleman;V. Tvergaard
中科院分区：
文献类型：
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作者：
A. Needleman;V. Tvergaard
在一个数值微观力学研究的拉伸性能的金属增强短晶须，金属的弹塑性变形的结晶塑性，使用平面晶体模型，允许两个或三个滑移系。平面应变分析进行了晶须体积分数为10%至30%的对齐的晶须的周期性阵列，并与预测的基础上相应的流动理论与各向同性硬化的塑性进行比较。复合材料增强晶须体积分数的预测趋势是相同的各种基体材料的本构特性。研究发现，晶体模型可以引起剪切局部化，从尖锐的晶须边缘开始。作为这种局部化的结果，应力承载能力最终下降。
In a numerical micromechanical study of the tensile properties of a metal reinforced by short whiskers, the elastic-plastic deformations of the metal are described in terms of crystalline plasticity, using a planar crystal model that allows for either two or three slip systems. Plane strain analyses are carried out for a periodic array of aligned whiskers for whisker volume fractions of 10 percent to 30 percent, and comparison is made with predictions based on a corresponding flow theory of plasticity with isotropic hardening. The predicted trend for composite strengthening with whisker volume fraction is the same for the various matrix material constitutive characterizations. It is found that the crystal model can give rise to shear localization, initiating at the sharp whisker edges. As a consequence of this localization, the stress carrying capacity eventually drops.