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Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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Optimum definition of true strain beneath a spherical indenter for deriving indentation flow curves

Cited 16 times inthomson ciCited 21 times inthomson ci
Title
Optimum definition of true strain beneath a spherical indenter for deriving indentation flow curves
Author
Jeon, ECKim, Ju-YoungBaik, MKKim, SHPark, JSKwon, D
Keywords
Finite element analysis; Indentation flow curve; Instrumented indentation technique; True strain; Work-hardening exponent
Issue Date
2006-03
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.419, no.1-2, pp.196 - 201
Abstract
Several methods have been suggested for deriving indentation flow curves using the instrumented indentation technique, in which true stress and true strain are defined with indentation parameters. The definition of true stress is nearly the same in all methods, but the definitions of true strain fall into two categories, sine function and tangent function. We adopted the work-hardening exponent to determine the definition appropriate in obtaining accurate indentation flow curves. The work-hardening exponent was proven to be affected only by the definition of true strain and not by other parameters when the effect of real contact depth was eliminated using finite element analysis. The sine function yields too large work-hardening behaviors for materials that obey power-law work-hardening, but the tangent function evaluates them accurately. The definition based on the tangent function was thus determined to be more appropriate in deriving the indentation flow curve.
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DOI
10.1016/j.msea.2005.12.012
ISSN
0921-5093
Appears in Collections:
MSE_Journal Papers
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