Indentation of power law creep solids by self-similar indenters

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

Chen, Wei-Min²  Cheng, Yang-Tse³  Li, Min¹ 

[1] Beijing Univ Aeronaut & Astronaut, Sch Aeronaut Sci & Technol, Beijing 100191, Peoples R China

[2] Chinese Acad Sci, Inst Mech, Lab Environm Mech, Beijing 100190, Peoples R China

[3] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA

关键词: Indentation;    Power law creep;    Dimensional analysis;    Self-similar indenters;   

DOI  :  10.1016/j.msea.2010.05.069

来源: Elsevier

【 摘 要 】

For creep solids obeying the power law under tension proposed by Tabor, namely sigma = b(epsilon) over dot(m), it has been established through dimensional analysis that for self-similar indenters the load F versus indentation depth h can be expressed as F(t) = bh(2)(t)[(h) over dot(t)/h(t)](m)Pi(alpha) where the dimensionless factor Pi(alpha) depends on material parameters such as m and the indenter geometry. In this article, we show that by generalizing the Tabor power law to the general three dimensional case on the basis of isotropy, this factor can be calculated so that indentation test can be used to determine the material parameters b and m appearing in the original power law. Hence indentation test can replace tension test. This could be a distinct advantage for materials that come in the form of thin films, coatings or otherwise available only in small amounts. To facilitate application values of this constant are given in tabulated form for a range of material parameters. (C) 2010 Elsevier B.V. All rights reserved.

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