高温仪器化压入测试中热接触对位移测量漂移的影响

陈克; 冯义辉; 彭光健; 张泰华

doi:10.6052/0459-1879-14-297

高温仪器化压入测试中热接触对位移测量漂移的影响

1.
中国科学院力学研究所非线性力学国家重点实验室, 北京100190
2. 浙江工业大学机械工程学院, 杭州310014

基金项目: 国家自然科学基金资助项目(11025212, 11272318, 11302231 和11402233).

详细信息

通讯作者:
张泰华,教授级高工,主要研究方向:微/纳米力学测试技术和性能表征.E-mail:zhangth@zjut.edu.cn

中图分类号: O348.3
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出版历程
- 收稿日期: 2014-09-25
- 修回日期: 2014-12-24
- 刊出日期: 2015-03-17

THERMAL CONTACT-INDUCED DISPLACEMENT DRIFT INHIGH-TEMPERATURE NANOINDENTATION

1.
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
2. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Funds: The project was supported by the National Natural Science Foundation of China (11025212, 11272318, 11302231, 11402233).

摘要

摘要: 基于对室温压头和热试样接触后传热过程的分析, 重点研究热接触引起的压头基托热膨胀对高温仪器化压入测试中位移测量漂移的影响. 首先, 通过热传导理论分析, 获得热接触后基托内温度场分布的解析解, 进而研究基托热膨胀引起的位移测量漂移量; 然后, 建立有限元分析模型, 数值模拟高温仪器化压入过程, 验证理论模型的准确性. 研究发现, 压头与热试样接触面间的热传导性质显著影响基托内的温度场分布; 对于不同材料的试样, 接触面间传热性能不同, 基托的热膨胀量差异可以达到几个数量级. 研究结果有助于优化高温压入测试程序, 提高测试的可靠性.
- 仪器化压入 /
- 高温 /
- 接触热传导 /
- 热膨胀 /
- 位移漂移
Abstract: Based on the analysis of heat transfer between indenter at room temperature and hot sample during their contact, this paper mainly studies the influence of thermal contact-induced expansion of the indenter holder on the displacement measurement in high-temperature instrumented nanoindentation. First of all, we derive an analytical solution of temperature distribution of the holder from the basic theory of heat conduction by appropriately simplifying the analysis model of hot nanoindentation, and use it to study the additional displacement caused by thermal expansion. Secondly, a finite element model (FEM) is established to investigate the thermal expansion-induced drift in hot nanoindentation to verify the analytical solution. It is found that the contact thermal properties between indenter and hot sample may significantly affect the distribution of temperature in holder. The thermal contact conductance between indenter and test sample varies from material to material, which can lead to the difference of several orders of magnitude of holder's thermal expansion. The research results may help to optimize the test program and improve the reliability of high-temperature instrumented nanoindentation.
- instrumented nanoindentation /
- high temperature /
- thermal contact conductance /
- thermal expansion /
- displacement drift

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