Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 8    August 2013

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Plastic characterization of metals by combining nanoindentation test and finite element simulation
Yong MA1, Ying ZHANG1, Hai-feng YU1, Xiang-yu ZHANG1, Xue-feng SHU2, Bin TANG 1

1. Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. Research Institute of Applied Mechanics and Biomedical Engineering,
Taiyuan University of Technology, Taiyuan 030024, China

Abstract: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 σy 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 and Al alloy.

 

Key words: nanoindentation; finite element simulation; representative stress; representative stain; initial yield stress

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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