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Effect of Surface Roughness on Determination of Creep Parameter using Impression Creep Technique

Published online by Cambridge University Press:  31 January 2011

Wuzhu Yan ,
Bin Zhao  and
Zhufeng Yue
Wuzhu Yan
Affiliation:
yanwuzhu24@mail.nwpu.edu.cn, Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an, China
Bin Zhao
Affiliation:
zhaobin@nwpu.edu.cn, Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an, shan'xi, China
Zhufeng Yue
Affiliation:
zfyue@nwpu.edu.cn, Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an, shan'xi, China
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Abstract

The indentation creep test, especially the impression creep, exhibits a magic appealing in the determination of creep properties of small structures in industry for its simplicity, efficiency and non-destruction merits. Most of previous researches of indentation or impression creep neglect the effect of surface roughness of materials, which plays a crucial role in extracting creep properties of materials. The FE results showed that the surface roughness has no effect on the determination of creep exponent when the punching stress is larger than 150MPa. However, under a smaller punching stress the stress exponent is decreased due to the “Tuner” effect of asperities. The conclusions drawn in the present study provide an important guidance on experiment results amendment for impression creep technique.

Keywords

nanoscalenano-indentationmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1224: Symposia FF/GG – Mechanical Behavior at Small Scales — Experiments and Modeling , 2009 , 1224-GG05-12
Copyright
Copyright © Materials Research Society 2010

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