Crack coalescence and growth in aircraft friction stir welded joints
- Ali A. ,
- Brown M.W. and
- Rodopoulos C.A.
- Ali A. ,
- Brown M.W. and
- Rodopoulos C.A.
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A plastic replication technique was employed to investigate surface crack initiation and growth in 2024-T351 Al alloy friction stir welded (FSW) joints during fatigue bending tests. Fatigue failure mechanisms were examined, and a modified Hobson-Brown crack growth model was used to predict FSW lifetimes. The experimental specimens were FSW plates of 2024-T351 (thickness 13 mm) made with the weld direction parallel to the rolling direction, tested as-welded, polished or peened. Fatigue endurance tests were performed under four-point bending at constant load amplitude, constant frequency (20 Hz) and a stress ratio of 0.1. Residual stresses were measured by hole-drilling strain gauge techniques. Microstructural observations were used to study crack initiation and growth from defects and oxide inclusions. The importance of defect size, grain size and residual stress in lifetime prediction analysis is discussed.
6th International Symposium, 10-13 Oct 2006, Session 3A: Fatigue I, Paper 02
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