Mechanical property evaluation through sharp indentations in elastoplastic and fully plastic contact regimes
Mechanical property evaluation through sharp indentations in elastoplastic and fully plastic contact regimes
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DOI：
10.1557/jmr.2003.0234
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发表时间：
2003-07
影响因子：
2.7
通讯作者：
M. Mata;J. Alcalá
中科院分区：
文献类型：
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作者：
M. Mata;J. Alcalá
在我们早期的接触变形机制的有限元模拟工作，数学公式推导出相关的硬度和堆积和下沉的现象与单轴力学性能的尖锐压头周围的量。无论应变硬化固体的接触响应的变形机制如何，该公式都是适用的。设计了一种方法，其中使用这些配方在机械性能评估压痕实验进行了演示。目前的结果与现有的方法使用II-定理在功能分析中提取单轴性能从仪表压痕载荷深度的渗透曲线。有人认为，由于表面变形是接触响应的一个重要特征，它直接或间接地进入这些现有的方法。本文认为，如何独立的表面变形的知识，可以用来指导机械性能评估从负荷深度的渗透曲线。通过压痕实验的力学特性的唯一性的讨论也提供了。
Following the finite element simulations in our earlier work about the contact deformation regimes, mathematical formulations were derived to correlate hardness and the amount of pileup and sinking-in phenomena around sharp indenters with uniaxial mechanical properties. The formulations are applicable regardless of the deformation regime ruling the contact response of a strain-hardening solid. A methodology was devised where the use of these formulations in mechanical property assessments from indentation experiments was demonstrated. The current results make contact with existing methodologies using the II-theorem in functional analysis to extract uniaxial properties from instrumented indentation load depth of penetration curves. It is argued that since surface deformation is an essential feature of the contact response, it enters directly or indirectly in such existing methodologies. The paper considers how independent knowledge of surface deformation can be used to guide mechanical property assessments from load-depth of penetration curves. A discussion on the uniqueness of mechanical characterizations through indentation experiments is also provided.