On correlation between the hardness-to-strength ratio and the plastic Poisson's ratio of nanoporous gold
On correlation between the hardness-to-strength ratio and the plastic Poisson's ratio of nanoporous gold
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DOI：
10.1080/21663831.2023.2181717
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发表时间：
2023-02
影响因子：
8.3
通讯作者：
Ling-Zhi Liu;Yefeng Zhang;H. Jin
中科院分区：
文献类型：
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作者：
Ling-Zhi Liu;Yefeng Zhang;H. Jin
我们报告说，硬度强度比与纳米多孔金的塑性泊松比不相关，反对肖-萨塔关系。相反，纳米多孔金的硬度-强度比随着应变硬化速率的增加而一致地增加。此外，在压缩硬化接近零的样品中，当塑性泊松比增加到0.27时，硬强比与1.0相差不大，这与米勒的模拟相呼应。目前的研究表明，硬度与强度比不是一个约束因素，但纳米多孔金的应变硬化率的指标，这可能适用于其他多孔材料与低至中等相对密度。影响声明广泛使用的硬度与强度比和塑性泊松比之间的相关性在纳米多孔金中是无效的;相反，其硬度对压缩中的应变硬化敏感。
We report that hardness-to-strength ratio is not correlated with plastic Poisson's ratio in nanoporous gold, arguing against the Shaw–Sata relation. Instead, the hardness-to-strength ratio of nanoporous gold increases consistently with increasing rate of strain hardening. Furthermore, in samples with near-zero hardening in compression, the hardness-to-strength ratio does not deviate much from 1.0 when the plastic Poisson's ratio increases up to 0.27, echoing Miller's simulation. Current study suggests that the hardness-to-strength ratio is not a restraint factor, but an indicator of the strain hardening rate for nanoporous gold, which might apply to other porous materials with low-to-medium relative densities. IMPACT STATEMENT A widely used correlation between the hardness-to-strength ratio and the plastic Poisson's ratio is invalid in nanoporous gold; instead, its hardness is sensitive to the strain hardening in compression.