Plastic characterization of metals by combining nanoindentation test and finite element simulation

作     者：Yong MA Ying ZHANG Hai-feng YU Xiang-yu ZHANG Xue-feng SHU Bin TANG Yong MA;Ying ZHANG;Hai-feng YU;Xiang-yu ZHANG;Xue-feng SHU;Bin TANG

作者机构：Research Institute of Surface Engineering Taiyuan University of Technology Taiyuan 030024 China Research Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology Taiyuan 030024 China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2013年第23卷第8期

页      面：2368-2373页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Project (51171125) supported by the National Natural Science Foundation of China Project (20110321051 ) supported by the Science and Technology Key Project of Shanxi Province, China 

主　　题：nanoindentation finite element simulation representative stress representative stain initial yield stress 

摘      要：Materials with the same elastic modulus E and representative stress and strain （σr,εr） present similar indentation-loading curves, whatever the value of strain hardening exponent n. Based on this definition, a good approach was proposed to extract the plastic properties or constitutive equations of metals from nanoindentation test combining finite element simulation. Firstly, without consideration of strain hardening, the representative stress was determined by varying assumed representative stress over a wide range until a good agreement was reached between the computed and experimental loading curves. Similarly, the corresponding representative strain was determined with different hypothetical values of strain hardening exponent in the range of 0-0.6. Through modulating assumed strain hardening exponent values to make the computed unloading curve coincide with that of the experiment, the real strain hardening exponent was acquired. Once the strain hardening exponent was determined, the initial yield stress ay of metals could be obtained by the power law constitution. The validity of the proposed methodology was verified by three real metals： AISI 304 steel, Fe andA1 alloy.