Fatigue behavior and modeling of thermoplastics including temperature and mean stress effects

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Abstract

An experimental investigation was conducted to evaluate fatigue behaviors of two thermoplastics. The effects considered include mold flow direction, thickness, mean stress, temperature, and frequency. Tension-compression as well as tension−tension load-controlled fatigue tests were performed at room temperature, −40°C and 85°C. Incremental step cyclic deformation tests were also performed to generate cyclic stress−strain curves to determine strain-life fatigue properties. The effect of mean stress was modeled using various parameters. The Walker mean stress model and a simple model with a mean stress sensitivity factor proved to be the most effective models to correlate the wide range of experimental data generated. POLYM. ENG. SCI., 54:725–738, 2014. © 2013 Society of Plastics Engineers

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