Evaluation of strain rate sensitivity by constant load nanoindentation
Evaluation of strain rate sensitivity by constant load nanoindentation
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DOI：
10.1007/s10853-012-6665-y
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发表时间：
2012-06
影响因子：
4.5
通讯作者：
D. Peykov;Ė. Martin;R. Chromik;R. Gauvin;M. Trudeau
中科院分区：
文献类型：
--
作者：
D. Peykov;Ė. Martin;R. Chromik;R. Gauvin;M. Trudeau
通过纳米压痕的恒定载荷测量提供了在亚微米尺度上从单个特征和缺陷测量应变率灵敏度的可能性。然而，最近的报告揭示了一个矛盾的负载依赖性（增加和减少应变速率敏感性与负载），这还没有得到充分的解释。在这项研究中，恒定载荷测量五种材料（锌，铝，铜，钛，和SiO2）进行了一系列的峰值载荷，然后与恒定应变速率的结果和传统的值在文献中进行比较。负载依赖性被认为是由整个测试的漂移误差的贡献越来越大。一个建议的框架，涉及更高的负载，更短的保持和加载时间，和一个物理健全的拟合方法，被发现产生明确的结果，从负载的依赖性，与传统的值和降低标准差的相关性提高。
Constant load measurements by nanoindentation offer the potential for measuring strain rate sensitivity from individual features and defects on a submicron scale. However, recent reports reveal a conflicting load dependence (both increasing and decreasing strain rate sensitivity with load) which has yet to be fully explained. In this study, constant load measurements on five materials (Zn, Al, Cu, Ti, and SiO2) were conducted over a range of peak loads, and then compared with both constant strain rate results and conventional values in the literature. The load dependence was found to be caused by the increasing contribution of drift errors throughout the test. A proposed framework, involving higher loads, shorter hold and loading times, and a physically sound fitting method, was found to produce unambiguous results free from load dependencies, with improved correlations to conventional values and reduced standard deviations.