Experimental and Numerical Study of Notch Geometry Effects on Fatigue Life Under Mixed Mode I and III Loading
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Fatigue is one of the main reasons of fracture in mechanical components. Generally performing experiments is a useful and effective method for determination of fatigue life. In this paper, results of different notch geometry effects on the fatigue life under mixed mode I and III were studied experimentally and numerically. For this purpose, fatigue specimens were manufactured according to the ASTM-A370 standard and all the specimens were quenched and tempered. Two types of notch geometries, V-shape and U-shape were considered in this study. The fatigue life was determined experimentally for each notch geometry and results were verified by finite element method simulation. Fractographic investigation was done broadly to determine cause of failure in the specimens. Our results showed that the notch geometry had significant effect on the fatigue life. Fatigue crack growth in the V-shape notch specimens happened quickly and the maximum fatigue life reduction occurred for that.
KeywordsNotch geometry Mixed mode loading Fatigue life FEM simulation Fractographic Crack growth
For this work we are grateful for the technical support by Parswitch Company and also Razi Metallurgical Center. The authors wish to thanks Prof. G.H. Farrahi for the provision of his beneficial help and comment.
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