|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||A 3-D Model for Quantification of Fatigue Weaklink Strength in an A713 Cast Aluminum Alloy (Note: This presentation will also appear in the poster session.)
||Lin Yang, Zhiqiang Xu, Yan Jin, Tongguang Zhai
|On-Site Speaker (Planned)
The stress/strain fields around a micro-pore in an A713 cast aluminum alloy (an elasto-plastic media) under cyclic loading were quantified as a function of pore position in depth on surface using a 3-D finite element method. The incubation life for the fatigue crack initiated from a surface pore could be estimated using a modified Manson-Coffin law. A 3-D pore-sensitive model was developed to quantify fatigue weaklink density and strength distribution, based on the finite element analysis and experimental measurements. It was found that the rate of crack initiation at pores in surface was a Weibull function of the applied stress, which was consistent with the experimental data. The percentage of crack initiation life increased with decrease in cyclic load, i.e., at a maximum stress just above the fatigue limit, it was over 95% the total fatigue life, compared to just 62.5% at the maximum stress of 110% yield strength.
||Planned: Publication Outside of TMS (Indicate publication title and publisher if known.)