Abstract
The present study deals with the investigation of cyclic plastic deformation behavior near crack-tip with/without overload. The effect of overload is studied on single edge notch tension SENT specimen in an elasto-plastic finite element FE analysis. Three different stress ratios, two different overload ratios and a selected stress intensity factor SIF range ΔK value are used. Chaboche model is used for characterizing SA333 Gr 6 C-Mn steel material behavior. Crack-tip cyclic stress/strain hysteresis loops, crack-tip residual stress field and crack-tip ratcheting strain accumulation are simulated with/without overload. Moreover, the effect of overload ratio, stress ratio, background ΔK-level and crack size on controlling the compressive residual stress field, generated near crack-tip after overloading, are discussed. The results show that the progressive accumulation of plastic strain in the crack-tip cyclic plastic zone tends to decrease after overloading. It is also noticed that the maximum magnitude and the size of compressive residual stress zone following a single overload increase with the increase in the overload crack size and the decrease in the background Rratio.The finding results provide insight into the understanding of cracked metallic parts’ fatigue response under variable amplitude loading.
Published Version
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