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Size Effects and Length Scales in Nano-indentation for body-centred cubic Materials with Application to Iron

Title
Size Effects and Length Scales in Nano-indentation for body-centred cubic Materials with Application to Iron
Author
George Voyiadjis
Keywords
gradient plasticity; size effects; intrinsic material length scale; geometrically necessary dislocation; iron; rate and temperature dependent
Issue Date
2011-02
Publisher
SAGE PUBLICATIONS INC
Citation
Journal of Nanoengineering and Nanosystems, 2010, 224(1-2)
Abstract
Material length scales used in conjunction with gradient theories are obtained in this work from experimental observations of body-centred cubic (BCC) metals. Nanoindentation experiments are performed on iron at different strain rates. A constant value material length scale is not always realistic and different problems under various deformation conditions could require different values. A variable physically based relation for the length scale is therefore introduced in this paper for different strain rates, temperatures, and accumulated plastic strain. The material parameters of this model can be scaled with temperature and rate indentation size effects (TRISE) encountered in nanoindentation experiments. Required numerical analysis is performed using ABAQUS software and a physically based viscoplastic constitutive model.
URI
http://journals.sagepub.com/doi/abs/10.1177/2041309210395457https://repository.hanyang.ac.kr/handle/20.500.11754/70396
DOI
10.1177/2041309210395457
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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