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Computational and Experimental Characterization of Indentation Creep

Published online by Cambridge University Press:  01 February 2011

Ming Dao ,
Hidenari Takagi ,
Masami Fujiwara  and
Masahisa Otsuka
Ming Dao
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Hidenari Takagi
Affiliation:
Graduate Student, Department of Mechanical Engineering, College of Engineering, Nihon University, Koriyama, Fukushima 963–8642, Japan.
Masami Fujiwara
Affiliation:
Department of Applied Physics, College of Engineering, Nihon University, Koriyama, Fukushima 963–8642, Japan.
Masahisa Otsuka
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Shibaura Institute of Technology, Minatoku, Tokyo 108x–8548, Japan.
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ABSTRACT:Detailed finite-element computations and carefully designed indentation creep experiments were carried out in order to establish a robust and systematic method to accurately extract creep properties during indentation creep tests. Finite-element simulations confirmed that, for a power law creep material, the indentation creep strain field is indeed self-similar in a constant-load indentation creep test, except during short transient periods at the initial loading stage and when there is a deformation mechanism change. Self-similar indentation creep leads to a constitutive equation from which the power-law creep exponent, n, the activation energy for creep, Qc and so on can be evaluated robustly. Samples made from an Al-5.3mol%Mg solid solution alloy were tested at temperatures ranging from 573 K to 773 K. The results are in good agreement with those obtained from conventional uniaxial creep tests in the dislocation creep regime.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 795: Symposium U – Thin Films - Stresses and Mechanical Properties X , 2003 , U8.23
Copyright
Copyright © Materials Research Society 2004

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