Advances in Production Engineering & Management
Volume 17 | Number 2 | June 2022 | pp 141–151
https://doi.org/10.14743/apem2022.2.426
A method for prediction of S-N curve of spot-welded joints
based on numerical simulation
Yang, L.; Yang, B.; Yang, G.W.; Xiao, S.N.; Zhu, T.; Wang, F.
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A B S T R A C T
Currently, ΔF-N curves are often used to predict the fatigue lives of spot-welded joints, but the method for obtaining these ΔF-N curves is time-consuming, laborious, and non-universal. Tensile-shear fatigue tests were performed to obtain the fatigue lives and the corresponding normalized S-N curves of spot-welded joints. Subsequently, the force acting at the spot-welded joints was obtained by extracting the force and moment of the beam element in the shell-element-based finite element model, and the equivalent structural stress at the spot-welded joint was obtained based on the equiva-lent structural stress method. Finally, the S-N curves of the spot-welded joints were fitted using the least-squares method. A comparison of the S-N curves of the spot-welded joints with those of different materials revealed that the material type had a significant influence on the S-N curve. To avoid this influence, a method for predicting the S-N curve of the spot-welded joints was proposed based on the relationship between the ratio of the ten-sile strength and that of the fatigue limit of each material. This research provides guidance for predicting the fatigue life of spot-welded joints in engineering applications.
A R T I C L E I N F O
Keywords • Spot-welded joints; Simulation; Numerical simulation; Finite element methods (FEM); S-N curve; Prediction method; Equivalent structural stress
Corresponding author • Yang, G.W.
Article history • Received 4 April 2022, Revised 16 August 2022, Accepted 20 August 2022
Published on-line • 31 August 2022
E X P O R T C I T A T I O N
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