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| Behavior of pile-up and sinking-in around spherical indentation and its effect on hardness determination |
| CUI Hang; CHEN Huaining; CHEN Jing; HUANG Chunling; WU Changzhong |
| Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
CUI Hang CHEN Huaining CHEN Jing HUANG Chunling WU Changzhong. Behavior of pile-up and sinking-in around spherical indentation and its effect on hardness determination. Chin J Mater Res, 2009, 23(1): 54-58.
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Abstract By the numerical simulation of spherical indenter, it was observed that for the material with strain hardening exponent n >0.23, sinking-in will happen for all values of yield strain σy/E, but when n <0.23, both pile-up and sinking-in depend on the changing of σy/E. For the material with σy/E >0.02, sinking-in was observed for all values of n during indenting, but when σy/E <0.02, both pile-up and sinkin depend on the changing of n. For the ratio of residual indentation depth and maximum indentation depth (hf /hmax)<0.76, the material shows sinking-in behavior, and the higher strain hardening exponent is, the greater sinking-in is. For hf /hmax>0.76, pile-up changes to sinking-in when n <0.23 and totally sinking-in when n >0.23. The relation between the feature of pile-up or sinking-in c2 and contact area was obtained, and the effect of c2 on error of hardness was analyzed.
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Received: 25 June 2008
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| Fund: Supported by Government Foundation of China and Russia No.20070634. |
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