An experimental study of high-pressure waterjet peening on 7075-T6 aluminum alloy was conducted to investigate the effects of waterjet on high-cycle fatigue life and fatigue crack growth. Unnotched hourglass-shaped circular cross section test specimens were fatigue tested in completely reversed rotating bending to determine fatigue life behavior curves). Single-edge-notched flat tensile test specimens were tested in the tension-tension fatigue crack growth tests to determine fatigue crack propagation behavior versus Surface characteristics and fracture surfaces were evaluated by scanning electron microscopy (SEM). Results show that waterjet peening can increase high-cycle fatigue life, delay fatigue crack initiation, and decrease the rate of fatigue crack propagation.
Issue Section:
Technical Papers
Keywords:
pressure vessels,
jets,
aluminium alloys,
fatigue cracks,
fatigue,
fatigue testing,
fracture
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