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首页> 外文期刊>International Journal of Solids and Structures >Effect of grain size on the indentation hardness for polycrystalline materials by the modified strain gradient theory
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Effect of grain size on the indentation hardness for polycrystalline materials by the modified strain gradient theory

机译:修正应变梯度理论对晶粒尺寸对多晶材料压痕硬度的影响

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摘要

Numerous indentation tests in the micrometer and nanometer scale have shown that the measured hardness decreases significantly with increasing indentation depth, and this is known as the indentation size effect (ISE). However, several other nanoindentation results for polycrystalline materials show that the indentation hardness increases with increasing indentation depth because of the grain boundary (GB) effect. In this work, we propose a new model for the indentation test using the modified strain gradient plasticity theory. The GB effect is considered by evaluating the density of GNDs on the GB. Using the proposed model, the indentation hardness of polycrystalline materials in micrometer-scale structures is investigated, and compared with experimental results from other researchers.
机译:微米级和纳米级的许多压痕测试表明,随着压痕深度的增加,测得的硬度会显着降低,这被称为压痕尺寸效应(ISE)。但是,多晶材料的其他一些纳米压痕结果表明,由于晶界(GB)效应,压痕硬度随压痕深度的增加而增加。在这项工作中,我们使用改进的应变梯度可塑性理论为压痕测试提出了一个新模型。通过评估GB上GND的密度来考虑GB效应。使用提出的模型,研究了微米级结构中多晶材料的压痕硬度,并将其与其他研究人员的实验结果进行了比较。

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