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Fatigue behavior and modeling of thermoplastics including temperature and mean stress effects
Author(s) -
Mellott Stephen R.,
Fatemi Ali
Publication year - 2014
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23591
Subject(s) - materials science , composite material , tension (geology) , stress (linguistics) , compression (physics) , deformation (meteorology) , linguistics , philosophy
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