ULTRA HIGH PRESSURE WATERJET PEENING PART II: HIGH CYCLE FATIGUE PERFORMANCE

Waterjet peening has recently emerged as one of the alternative surface treatment processes to improve the fatigue life of the components. Part I of this experimental study has been concentrated on surface characteristics of waterjet peened material. In this part of the study, unnotched hourglass shaped circular cross section test specimens were fabricated and surface treated for selected waterjet peening conditions. Completely reversed rotating bending fatigue tests were conducted on peened aluminum specimens to evaluate fatigue performance (S-N curves). Fracture surfaces were evaluated by scanning electron microscopy (SEM) to identify the fatigue mechanisms. Results show that waterjet peening can enhance the fatigue strength by 2030% to that of unpeened Al7075-T6 material.

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