Temperature-dependent constant fatigue life diagram for press-formed short carbon fiber reinforced polyamide composite

Autor: Masamichi Kawai, S. Funaki, Noriyuki Hirano, Ichiro Taketa
Rok vydání: 2018
Předmět:
Zdroj: Advanced Composite Materials. 28:1-28
ISSN: 1568-5519
0924-3046
DOI: 10.1080/09243046.2018.1434915
Popis: Fatigue strength of a short carbon fiber reinforced polyamide (SCF/PA) composite fabricated using a press forming technique is examined. Unlike an injection-molded SCF/PA composite, this one exhibits in-plane isotropy as well as through-thickness uniformity. Fatigue tests on the SCF/PA composite are carried out at different stress ratios and temperatures, respectively. The fatigue test results show that the S–N relationship for the SCF/PA composite significantly depends on stress ratio, and fatigue degradation occurs most rapidly at the critical stress ratio, regardless of test temperature. The fatigue stress for a given life decreases with temperature. The reduction in fatigue strength with temperature correlates well with the reduction in static strength with temperature. Accordingly, the effect of temperature on fatigue life for each of different constant values of stress ratio can approximately be removed by normalizing fatigue stress with respect to static strength. The full shape of constant fatigue...
Databáze: OpenAIRE