August 1, 2025

Fatigue Strength of Peened-Welded Joints after Single High Compressive Load Peaks

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Investigation reveals fatigue strength declines in peened-welded joints after compressive loads, suggesting monitoring residual stress is vital.

MAIN FINDING: Fatigue strength of peened-welded joints decreases as compressive load increases.
KEY EVIDENCE: At a load of 5.8 kN, fatigue strength approached that of as-weld joints.
APPROACH: Residual stresses were assessed using an X-ray residual stress analyzer during plate bending tests.
SIGNIFICANCE: A new design curve for fatigue strength emphasizes the importance of maintaining residual compressive stress.

Banno et al. (2025) studied this question.

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Investigation reveals fatigue strength declines in peened-welded joints after compressive loads, suggesting monitoring residual stress is vital.