Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : residual stresses

The Effect of Shot Peening and Residual Stresses on Cumulative Fatigue Damage

Hussain J. M. Alalkawi; Qusay Khalid Mohammed; Waleed Sadun Al-Nuami

Engineering and Technology Journal, 2010, Volume 28, Issue 15, Pages 5055-5070

A series of constant and cumulative fatigue tests under the effect of shot peening were conducted for two aluminum alloys 2024 and 5052. Three unpeed specimens were tested for each alloy under low-high stress levels (120-280 MPa) for 2024 aluminum alloy and (40-90 MPa) for 5052 aluminum alloy at room temperature and stress ratio R= -1. Other specimens were exposed to shot peening with different blasting time before the cumulative fatigue testing. It is found for 2024 Al alloy that as the shot peening time increases the cumulative fatigue life is improved but above 10 min. the life is reduced. For 5052 Al alloy the cumulative fatigue life is reduced as shot peening time increases

Influence of Shot Peening on 70/30 Brass Residual Stresses Using Plasticity Theory

Hussain J. M. Alalkawi; Qusay Khalid Mohammed; Abbas A. AL; Asadi

Engineering and Technology Journal, 2009, Volume 27, Issue 16, Pages 3064-3075

Residual stresses play an important role in the behavior of structures
subjected to static and dynamic loads. The main aim of this study is to estimate experimentally the residual stresses in 70/30 brass material tested in bending and torsion using the plasticity theory. The influence of shot peening process on the tensile residual stresses is discussed. It is shown that the shot peening strongly influences the residual stresses, i.e. shot peening will reduce the tensile residual
stresses by 13.6% of the yield strength in bending tests. While will reduce the tensile residual stresses by 22% of shear yield stress in torsion tests.