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Numerical approaches and experimental verification of the conical indentation techniques for residual stress evaluation

Published online by Cambridge University Press:  31 January 2011

Jin Haeng Lee ,
Hyungyil Lee ,
Hong Chul Hyun  and
Minsoo Kim
Jin Haeng Lee*
Affiliation:
Sogang University, Department of Mechanical Engineering, Seoul 121-742, Republic of Korea
Hyungyil Lee
Affiliation:
Sogang University, Department of Mechanical Engineering, Seoul 121-742, Republic of Korea
Hong Chul Hyun
Affiliation:
Sogang University, Department of Mechanical Engineering, Seoul 121-742, Republic of Korea
Minsoo Kim
Affiliation:
Sogang University, Department of Mechanical Engineering, Seoul 121-742, Republic of Korea
*
a)Address all correspondence to this author. e-mail: jinhaeng@sogang.ac.kr Present address: Korea Atomic Energy Research Institute, Yuseong-gu, Daejeon 305-353, Republic of Korea.
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Abstract

Conical indentation methods to determine residual stress are proposed by examining the finite element solutions based on the incremental plasticity theory. We first note that hardness depends on the magnitude and sign of residual stress and material properties and can change by up to 20% over a specific range of elastic tensile and compressive residual stress, although some prior indentation studies reported that hardness is hardly affected by residual stress. By analyzing the characteristics of conical indentation, we then select some normalized indentation parameters, which are free from the effect of indenter tip rounding. Adopting dimensional analysis, we present practical conical indentation methods for the evaluation of elastic/plastic equi- and nonequi-biaxial residual stresses. The validity of developed approaches is confirmed by applying them to the experimental evaluation of four-point bending stress.

Keywords

NanoindentationStress/Strain RelationshipSimulation
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 11 , November 2010 , pp. 2212 - 2223
Copyright
Copyright © Materials Research Society 2010

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References

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