Browsing by Subject "crack growth"

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    Prediction of Fatigue Lives in Additively Manufactured Alloys Based on the Crack-Growth Concept
    (University of Texas at Austin, 2017) Yadollahi, Aref; Mahtabi, Mohammad J.; Doude, Haley R.; Newman, James C. Jr
    This paper aims to predict the fatigue behavior of additively manufactured alloys using crack-growth data. Among different sources of damage under cyclic loadings, fatigue due to cracks originated from voids is the most life-limiting failure mechanism in powder-based metal additive manufacturing (AM) parts. Hence, the ability to predict the fatigue behavior of AM materials based on the void features is the first step toward improving AM part reliability. Test results from the literature on AM alloys are analyzed herein to model fatigue behavior based on the semi-circular surface flaws. The fatigue-life variations in the specimens are captured using the distribution of defect size. The results indicate that knowing the statistical distribution of the defect size can provide the opportunity of predicting the scatter in the fatigue-life of the AM materials, using an appropriate fatigue analysis code.