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A Study on Residual Stress Relaxation under Quasi-Static Load

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Abstract:

Investigation on the quasi-static residual stress relaxation is an important aspect of component design and life management. After taking into account the influence of transverse stress and strength distribution, this paper proposes a new criterion of residual stress relaxation under quasi-static load as follow: the surface residual stress tends to relax as long as the Mises effective stress anywhere exceeds the local yield point. In addition, by X-ray tensile test, a method of determining superficial yield strength based on the Von Mises hypothesis was applied at the shot-peened surface of a martensitic stainless steel 0Cr13Ni4Mo. The experimental results show that the yield strength of superficial layer is larger than that of core material. According to the experimental results, a simplified ladder-shaped model of the depth distribution of yield strength is proposed. On the basis of the above-mentioned relaxation criterion and the strength distribution model, a new method is presented to calculate the relaxation amount. The calculated results coincide with the experimental results.

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Periodical:

Materials Science Forum (Volumes 490-491)

Pages:

430-435

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.490-491.430

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Online since:

July 2005

Authors:

M. Qin, Vincent Ji, S.Y. Ma, J.B. Li

Keywords:

Biaxial Stress, Quasi-Static Load, Residual Stress Relaxation, X-Ray Tensile Test

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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