Void nucleation by inclusion debonding in a crystal matrix
Void nucleation by inclusion debonding in a crystal matrix
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DOI：
10.1088/0965-0393/1/2/001
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发表时间：
1993
影响因子：
1.8
通讯作者：
Xiaopeng Xu;A. Needleman
中科院分区：
文献类型：
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作者：
Xiaopeng Xu;A. Needleman
在数值微观力学研究的空隙成核，框架中使用的本构关系是指定独立的矩阵，空隙成核颗粒和界面。对圆柱形颗粒的双周期阵列进行了平面应变分析。颗粒被认为是刚性的和弹性-塑性变形的矩阵中描述的连续结晶塑性方面，使用平面晶体模型，允许三个滑移系。比较空洞形核预测的基础上相应的流动理论的塑性各向同性硬化。晶体模型可以引起剪切局部化的颗粒-基体界面和剪切局部化，这导致大的局部应变在基体中，被发现抑制脱粘。的应力状态的三轴性在确定是否发生脱粘或本地化的作用进行了研究。一个参数的研究也进行了晶体矩阵使用两种描述的界面剪切行为;一个是周期性的剪切位移在整个界面，而另一个允许剪切脱粘。
In a numerical micromechanical study of void nucleation, a framework is used where constitutive relations are specified independently for the matrix, the void-nucleating particles and the interface. Plane strain analyses are carried out for a doubly periodic array of circular cylindrical particles. The particles are taken to be rigid and the elastic-plastic deformations of the matrix are described in terms of continuum crystalline plasticity, using a planar crystal model that allows for three slip systems. Comparison is made with void-nucleation predictions based on a corresponding flow theory of plasticity with isotropic hardening. The crystal model can give rise to shear localization at the particle-matrix interface and shear localization, which leads to large localized strains in the matrix, is found to inhibit decohesion. The role of the triaxiality of the stress state in determining whether decohesion or localization occurs first is investigated. A parameteric study is also carried out for a crystal matrix using two descriptions of the interface shear behaviour; one is periodic in the shear displacement across the interface, while the other allows for shear decohesion.