Effects of compressive residual stress on bending propagation behaviour of fatigue crack

Issue title: Selected Papers from the 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), Part II

Article type: Research Article

Authors: Ma, Youli^a

Affiliations: [a] School of Civil and Refrigeration Engineering, Harbin University of commerce, Harbin, 150028, China

Abstract: Testing for bending fatigue crack propagation under mixed-mode condition was carried out using fatigue and annealed slant pre-cracks with different slant angles, β, defined as the angle between loading and crack directions in a rectangular plate. As a result, bending fatigue crack from the fatigue pre-crack with β=45 deg propagated under mixed-mode condition with mode I and II stress intensity factors K_{I} and K_{II}, while bending fatigue cracks from the fatigue pre-crack of β=60 deg and from the annealed pre-cracks with both slant angles of β=60 deg and β=45 deg propagated under mode I crack behavior. Furthermore, the estimated fracture angles calculated by maximum tangential criterion using the stress intensity factors, K_{I} and K_{II}, are in good agreement with the measurement ones except the fatigue pre-crack of β=45 deg at the initial premium propagation. That is to say fatigue crack propagation behavior was effected by compressive residual stress around pre-crack while the slant angle β is smaller (such as β=45 deg in this study). But the effect was disappeared if β became bigger (such as β= 60 deg.).

Keywords: Mixed-mode, compressive residual stress, bent fatigue crack, fatigue crack propagation, crack discontinuous displacement, fatigue pre-crack, annealed pre-crack

DOI: 10.3233/JAE-2010-1287

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 3-4, pp. 1579-1585, 2010