Actual indenter tip geometries, material elastoplastic deformation laws and universal hardness
Actual indenter tip geometries, material elastoplastic deformation laws and universal hardness
复制标题
实际压头尖端几何形状、材料弹塑性变形定律和通用硬度
DOI：
10.3139/146.020862
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发表时间：
2002
影响因子：
2.7
通讯作者：
G. Erkens
中科院分区：
文献类型：
--
作者：
K. Bouzakis;N. Michailidis;S. Hadjiyiannis;G. Skordaris;G. Erkens
在每一个技术应用中，材料力学性能的精确知识一直是一个核心问题。通过开发的有限元法（FEM）对纳米压痕进行连续模拟，充分模拟了加载和卸载阶段的作用力随侵彻深度的变化过程，并逐步定义了相应的材料应力应变曲线以及通用硬度。此外，实际的尖端几何形状的各种压头接近，并通过等效的大小描述。结果表明，由于考虑了现有压头尖端形状与其理想几何形状的偏差，所定义的材料弹塑性变形特性与压头类型（如维氏或伯科维奇）无关。此外，利用已开发的基于有限元的纳米压痕模拟，充分阐明了压头尖端几何形状对定义的本构规律和通用硬度的影响。本文给出了各种材料的应力-应变曲线和通用硬度随压痕深度的变化过程。
The precise knowledge of materials mechanical properties is always a core issue in every technical application. Through a developed finite elements method (FEM) continuous simulation of the nanoindentation, the applied force course versus the penetration depth is adequately simulated during the loading and unloading phases of this test, and the corresponding material stress ‐ strain curves, as well as the universal hardness, are stepwise defined. Furthermore, the actual tip geometries of various indenters are approached and through equivalent magnitudes described. The results show that the defined material elastoplastic deformation characteristics are independent of the indenter type, as Vickers or Berkovich, since the existing indenter tip form deviations from their ideal geometry are considered. Furthermore, using the developed FEM-based nanoindentation simulation, the influence of the indenter tip geometry on the defined constitutive laws and the universal hardness is sufficiently elucidated. Various materials stress ‐ strain curves and universal hardness courses versus the indentation depth, determined by means of the developed procedure, are presented.