During the seam weld fatigue analysis of a specific component, observed a significant increase in life after adjusting the weld length by just 1 or 2 mm. What factors contribute to this drastic change in fatigue life? Are there any reference papers available that explain the fundamentals or physics behind this phenomenon?
The drastic change in fatigue life after a small weld length adjustment is primarily due to reduced stress concentrations (because the welds are usually regarded as the stress concentrators), better load redistribution, and altered crack initiation and propagation behavior at the weld ends. These adjustments improve stress distribution, mitigate residual stresses, and optimize the weld's interaction with the applied load, significantly enhancing fatigue performance.
it's better to find a review paper, there are tons of it!
I could help you better if it was spotwelds. I'll share you a couple of papers and I recommend you to go through their references to find your paper:
1-Article Fatigue Life Prediction of Spot-Welded Joints Using a Novel ...
2-Chapter Fatigue Life Prediction of Spot Welded Joints: A Review
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