Abstract
Rotating bending fatigue tests were conducted in order to investigate effects of laser peening (LP) treatment on fatigue property of rolled aluminum alloys A7050-T7451 for aircraft structures. As the results, the LP treatment was effective for the fatigue property improvement of A7050-T7451 alloys. The fatigue strength of the alloys at 107 cycles was increased by 50-60 MPa by LP treatment. It is assumed that the reason of the fatigue life increase by LP treatment is hardness increase and residual stress near the specimen surface. The fatigue lives of non-treated material scattered effected by large grain groups near the specimen surface. The scatter of fatigue lives became very small by LP treatment.
