Fatigue Behavior of Shot Peened Notched Specimens: Effect of the Residual Stress Field Ahead of the Notch Root

• DOI: 10.1016/j.proeng.2015.06.210
• Publication Date: 2015-07-13T22:33:59Z
• Authors: M. Benedetti; V. Fontanari; B. Winiarski; P.J. Withers; M. Allahkarami; J.C. Hanan
• Keywords: 0203 mechanical engineering; notch fatigue; residual stresses; critical distance theory; Al-7075-T651; critical distance theory; notch fatigue; residual stresses; Shot peening; Engineering (all); 02 engineering and technology; Al-7075-T651; Shot peening; Engineering(all)

AbstractShot peening strongly increases the notch fatigue strength of metallic components. This benefit is mainly attributed to compressive residual stresses. In this paper, we address this topic by performing bending fatigue tests on Al-7075-T651 samples carrying notches with different severity. Fatigue lives between 105 and 108 cycles have been explored. The residual stress field ahead of the notch has been characterized by experimental measurements and numerical reconstruction and incorporated into the Crossland fatigue criterion combined with critical distance theory method to predict the fatigue resistance.