Effect Of Biaxial Stress By Shot Peening On Fatigue Limit

Author:  N. Hu, X. Wang, D. Zhang, K. Xu
Source:  Conf Proc: ICSP-4, (p.427-434)
Doc ID:  1990022
Year of Publication:  1990
Abstract:  
Residual stresses are mostly created in a multiaxial state, even for thin layer surface hardening, it is yet biaxial. Dang-Van suggested a multiaxial fatigue criterion based upon maximum hydrostatic pressure P(max) vs. cyclic shear stress +_(a). Shot peening and prestressed peening are applied in this study to adjust the residual stress values on the surface layers. +_(m) is changed with different R ratios. Goodman and Dang-Van criteria are both employed to calculate the fatigue limit. Results show that the correlation coefficient of +_(a) vs. P(max) in the Dang-Van diagram is better than +_(a) vs. +_(m) + +_(r) in the Goodman diagram, due to the biaxial stress state of shot peened specimen. The way to characterize the residual stress and the evaluation of Dang-Van criterion are also discussed. Descriptors: Residual stress; Shot peening; Fatigue limit