Journal
POLYMER ENGINEERING AND SCIENCE
Volume 54, Issue 3, Pages 725-738Publisher
WILEY-BLACKWELL
DOI: 10.1002/pen.23591
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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 degrees C and 85 degrees 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. (c) 2013 Society of Plastics Engineers
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