Determination of unique plastic properties from sharp indentation
Determination of unique plastic properties from sharp indentation
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DOI：
10.1016/j.ijsolstr.2019.04.008
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发表时间：
2019-10-15
影响因子：
3.6
通讯作者：
Poehl, F.
中科院分区：
文献类型：
--
作者：
Poehl, F.
提出了一种从给定的载荷-位移曲线（P-h曲线）中唯一确定杨氏模量E、强度系数K和应变硬化指数n （Lunwix幂律）的方法。该方法基于材料参数（E， K和n）与压痕结果（C和W-el/W-tot）之间的解析和数值（FEM）关系。结果表明，在已知杨氏模量的情况下，自相似压头的单个P-h曲线包含足够的信息来唯一确定K和n。如果杨氏模量不是先验已知的，则需要额外的P-h曲线来唯一确定所有三个材料参数。提出的方法随后在所谓的神秘材料上进行了数值验证（Chen et al., 2007）。(C) 2019 Elsevier Ltd.版权所有。
A method is proposed which allows for the unique determination of Young's modulus E, strength coefficient K and strain hardening exponent n (Lunwix power-law) from given load-displacement curves (P-h curves). The method is based on analytically and numerically (FEM) derived relationships between the material parameters (E, K and n) and the indentation results (C and W-el/W-tot). It is shown that in case of a known Young's modulus a single P-h curve of a self-similar indenter contains sufficient information for the unique determination of K and n. Is the Young's modulus not a priori known an additional P-h curve is required for the unique determination of all three material parameters. The proposed method was subsequently numerically verified for so-called mystical materials (Chen et al., 2007). (C) 2019 Elsevier Ltd. All rights reserved.