A study of microindentation hardness tests by mechanism-based strain gradient plasticity
A study of microindentation hardness tests by mechanism-based strain gradient plasticity
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DOI：
10.1557/jmr.2000.0258
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发表时间：
2000-08
影响因子：
2.7
通讯作者：
Yonggang Huang;Zhenyu Xue;Huajian Gao;W. Nix;Z. Xia
中科院分区：
文献类型：
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作者：
Yonggang Huang;Zhenyu Xue;Huajian Gao;W. Nix;Z. Xia
我们最近提出了基于机制的应变梯度(MSG)塑性理论来解释微米和亚微米尺度塑性变形的尺寸相关性。MSG塑性理论通过将泰勒的位错硬化模型与应变梯度塑性联系起来的多尺度、层次化框架，将微米尺度的塑性与位错理论联系起来。在这里，我们表明，当味精塑性理论，当用于研究微压入，确实再现了在实验中观察到的线性相关性，从而提供了一个重要的自洽的理论检查。在压痕模型中考虑了堆积、凹陷和压头半径的影响。为了实现这一目标，我们推广了味精塑性理论，将弹性变形包括在分层框架中。
We recently proposed a theory of mechanism-based strain gradient (MSG) plasticity to account for the size dependence of plastic deformation at micron- and submicronlength scales. The MSG plasticity theory connects micron-scale plasticity to dislocation theories via a multiscale, hierarchical framework linking Taylor’s dislocation hardening model to strain gradient plasticity. Here we show that the theory of MSG plasticity, when used to study micro-indentation, indeed reproduces the linear dependence observed in experiments, thus providing an important self-consistent check of the theory. The effects of pileup, sink-in, and the radius of indenter tip have been taken into account in the indentation model. In accomplishing this objective, we have generalized the MSG plasticity theory to include the elastic deformation in the hierarchical framework.