Bending Fatigue Behavior Of Differently Heat Treated And Shot Peened A1cu5mg2

Author:  Hirsch, Vohringer, Macherauch
Source:  Conf Proc: ICSP-2, (p. 90-101)
Doc ID:  1984005
Year of Publication:  1984
Abstract:  
The effect of different shot peening and heat treatments on the cyclic bending fatigue behavior of a precipitation hardenable aluminum alloy of the type A1Cu5Mg2 was investigated. Depending on the material states different increases in fatigue life and bending fatigue limit were obtained. The amounts of increase can be considered to be mainly a result of the surface work hardening and surface residual stresses. The surface roughness is of minor importance. Shot peening residual stresses become less stable with increasing loading stress. They were reduced especially during the first load cycle. The relaxation rate depends on initial surface residual stresses, on the stress amplitude and on the surface yield strength. The latter can be determined by combined quasistatic tension and compression tests as well as by X-ray measurements. Descriptors: Aluminum alloy; Shot peening, Bending fatigue behavior; Residual stresses; Relaxation of residual stresses