Effect of Weld Residual Stress on Fatigue Analysis of Nozzle

Kim, Sang-Chul; Kim, Man-Won

doi:2014.32.1.71

J Weld Join > Volume 32(1); 2014 > Article

Research Paper

Journal of Welding and Joining 2014;32(1):71-78.
DOI: https://doi.org/10.5781/JWJ.2014.32.1.71 Published online February 27, 2014.

Effect of Weld Residual Stress on Fatigue Analysis of Nozzle

Sang-Chul Kim^*, Man-Won Kim^**

Correspondence: Sang-Chul Kim,
Email: sckim@semyung.ac.kr

Abstract

Although the fatigue design curve of ASME Code has enough margin with respect to alternating stress and cycles, the welding residual stress(WRS) should be included in fatigue analysis. In this paper, WRS distribution in a nozzle with dissimilar metal weldment was obtained by finite element analysis and was added in fatigue analysis. The fatigue analysis was performed by following the ASME Code including thermal and stress analysis applying with postulated 30 transient conditions. The calculated results of a cumulative fatigue usage factors(CUF) were compared for the case of the models with or without WRS effects. The results showed that the CUF at weldment and heat affected zone was affected by the WRS.

Key Words: Fatigue analysis, Cumulative usage factor, Dissimilar metal weld, Finite element method, weld residual stress