Effect of stress ratio on tension and delamination fatigue behavior in CF/epoxy laminates

Autor:	Takahira Aoki, Hideki Sembokuya, Hiroshi Maki, Masaki Hojo, Kiyoshi Kemmochi, Chohachiro Nagasawa
Rok vydání:	1991
Předmět:	Materials science business.industry Tension (physics) Mechanical Engineering Delamination Fracture mechanics Structural engineering Paris' law Stress (mechanics) Crack closure Mechanics of Materials Ceramics and Composites Composite material business Stress intensity factor Stress concentration
Zdroj:	Advanced Composite Materials. 1:261-275
ISSN:	1568-5519 0924-3046
DOI:	10.1163/156855191x00153
Popis:	The effect of stress ratio on tension-tension fatigue behavior and mode I delamination fatigue crack propagation behavior was investigated for Toray T300/#3601, T800/#3601 and T800/#3631 laminates. Unidirectional laminates and quasi-isotropic laminates were used for tension-tension fatigue tests. For delamination fatigue crack propagation tests, double cantilever beam specimens made of unidirectional laminates were used. For the tension fatigue tests, the slope of the relation between the normalized maximum stress and the number of cycles to failure was very small. For delamination fatigue crack growth tests, the exponent of the power function in the relation between the crack propagation rate and the stress intensity range was very large. The analysis of the equivalent stress intensity range proposed by the authors showed that the contribution of the maximum stress was large in delamination fatigue crack propagation. A similar analysis was applied to the results of the tension fatigue tests. The contribu...
Databáze:	OpenAIRE
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