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A novel method for determining surface residual stress components and their directions in spherical indentation

Published online by Cambridge University Press:  21 April 2015

Lei Shen ,
Yuming He ,
Dabiao Liu ,
Qiang Gong ,
Bo Zhang  and
Jian Lei
Lei Shen
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Yuming He*
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Dabiao Liu
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Qiang Gong
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Bo Zhang
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Jian Lei
Affiliation:
Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this paper, a novel method is proposed to determine surface residual stress components and their directions based on the spherical indentation. To obtain the direction and the components of a uniaxial or biaxial residual stress, the relationship between the pile-up deformation around an indentation after unloading and the residual stress was firstly systematically studied and established by using numerical simulation. Through theoretical analysis and numerical simulation, we found that the position of the maximum residual stress is dependent on the maximum pile-up around an indentation after unloading. The direction and components of residual stress can be correctly determined by the unique relationship between pile-up after unloading and biaxial residual stress. This conclusion has been verified by the experiment results in the residual stress measurements of a welded specimen with spherical indentation and x-ray diffraction methods. Meanwhile, the influences of friction between the object surface and the indenter, the material hardening exponent of the specimen, and the elastic deformation upon the residual stress are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 8 , 28 April 2015 , pp. 1078 - 1089
Copyright
Copyright © Materials Research Society 2015 

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References

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