SYMPOSIA PAPER Published: 14 April 2017
STP159820160054

Data Processing Procedure for Fatigue Life Prediction of Spot-Welded Joints Using a Structural Stress Method

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The structural stress method is widely used in fatigue-life prediction of various welded joints in vehicle structures because this method is less dependent on mesh sizes in finite-element models. However, there are several parameters that define the structural stress, and extensive analysis is required to obtain an optimum structural-stress versus fatigue-life curve of the joints. This paper establishes a data-processing procedure for fatigue-life prediction of spot-welded joints using a structural stress method. The structural stress method used in this study is influenced by sheet thicknesses, joint dimensions, and stress types. These influencing parameters are optimized by a nonlinear, generalized, reduced-gradient solver. Previous fatigue test data from the Auto/Steel Partnership is reanalyzed using this proposed optimization method, and the degree of scatter in the reproduced master curve is found to be reduced compared to past results with default parameters. The estimated specimen life using this procedure correlates well with the actual life observed in the laboratory.

Author Information

Kang, Hong-Tae
The University of Michigan-Dearborn, Dept. of Mechanical Engineering, Dearborn, MI, US
Wu, Xiao
The University of Michigan-Dearborn, Dept. of Mechanical Engineering, Dearborn, MI, US
Khosrovaneh, Abolhassan, K.
General Motors LLC, Warren, MI, US
Li, Zhen
The University of Michigan-Dearborn, Dept. of Mechanical Engineering, Dearborn, MI, US
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Details
Developed by Committee: E08
Pages: 198–211
DOI: 10.1520/STP159820160054
ISBN-EB: 978-0-8031-7640-9
ISBN-13: 978-0-8031-7639-3