Influence of residual stresses from shot peening on fretting fatigue crack growth
2007 (English)In: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 30, no 10, 947-963 p.Article in journal (Refereed) Published
One method to improve fretting fatigue life is to shot peen the contact surfaces. Experimental fretting life results from specimens in a Titanium alloy with and without shot peened surfaces were evaluated numerically. The residual stresses were measured at different depths below the fretting scar and compared to the corresponding residual stress profile of an unfretted surface. Thus, the amount of stress relaxation during fretting tests was estimated. Elastic-plastic finite element computations showed that stress relaxation was locally more significant than that captured in the measurements. Three different numerical fatigue crack growth models were compared. The best agreement between experimental and numerical fatigue lives for both peened and unpeened specimens was achieved with a parametric fatigue growth procedure that took into consideration the growth behaviour along the whole front of a semi-elliptical surface crack. Furthermore, the improved fretting fatigue life from shot peening was explained by slower crack growth rates in the shallow surface layer with compressive residual stresses from shot peening. The successful life analyses hinged on three important issues: an accurate residual stress profile, a sufficiently small start crack and a valid crack growth model.
Place, publisher, year, edition, pages
2007. Vol. 30, no 10, 947-963 p.
fatigue crack growth, finite element method, fretting fatigue, peening, residual stress relaxation
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-6424DOI: 10.1111/j.1460-2695.2007.01165.xISI: 000249428500005ScopusID: 2-s2.0-34548702218OAI: oai:DiVA.org:kth-6424DiVA: diva2:11129
QC 201008272006-11-232006-11-232011-11-07Bibliographically approved