Competition between interface and bulk dominated plastic deformation in strain gradient plasticity
Competition between interface and bulk dominated plastic deformation in strain gradient plasticity
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DOI：
10.1088/0965-0393/15/1/s06
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发表时间：
2006
影响因子：
1.8
通讯作者：
Per Fredriksson;P. Gudmundson
中科院分区：
文献类型：
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作者：
Per Fredriksson;P. Gudmundson
在本报告中，在应变梯度塑性框架内研究了体相和界面相耗散塑性应变梯度效应之间的竞争。对于具有弹塑性界面的薄膜，从硬化行为和强度的角度对界面模型进行了分析。结果表明，材料和界面的长度尺度效应均提高了薄膜的屈服强度。这种效应受一个相当简单的规则支配，即块体和界面的最薄弱环节。此外，如果允许界面硬化，在增加载荷的过程中，薄膜的本体(内部)和界面会观察到三个区域：(I)弹性本体和刚性界面，(Ii)本体和界面塑料和(Iii)塑料本体和刚性界面。用参数研究的数值结果说明了该模型的性质。
In the present report, the competition between dissipative plastic strain gradient effects in the bulk and in an interface is investigated within a strain gradient plasticity framework. The model of the interface is analysed in terms of hardening behaviour and strength for the case of a thin film with an elastic–plastic interface. It is found that the yield strength of the film is increased by length scale effects both in the bulk material and the interface. The effect is governed by quite a simple rule, namely the weakest link of bulk and interface. In addition, if the interface is allowed to harden, three regions are observed for the bulk (interior) and interface of the film during an increasing load: (i) elastic bulk and rigid interface, (ii) both bulk and interface plastic and (iii) plastic bulk and rigid interface. The properties of the model are illustrated with numerical results from a parametric study.