Coverage Effects in Shot Peening of AL 2024-T4

Author:  T. Ludian and L. Wagner
Source:  Conf Proc: ICSP-9 (pg 296-301)
Doc ID:  2005100
Year of Publication:  2005
INTRODUCTION It is often anticipated that 100% coverage in shot peening is required to achieve full benefit in terms of near-surface high dislocation densities, residual compressive stresses and fatigue performance [1]. Since the residual stress field caused by a single impact, however, is much greater than the size of the indentation, it can be argued that 100% coverage may not be required [2]. On the other hand, there are shot peening specifications that require even more than 100%, e.g., 200% coverage. The present work was aimed at evaluating the effect of coverage in shot peening on the fatigue performance of the well known aircraft alloy Al 2024-T4. Particular emphasis was put on studying the effects of coverage on the resistances to fatigue crack nucleation and micro-crack growth.

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