1005 CFRPの破壊確率を考慮した等寿命線図とそれを用いたP-S-N線図の予測(OS9-1 オーガナイズドセッション《複合材料の変形と破壊およびマルチスケール計算技術》)

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  • 1005 Constant Life Diagram Considering Failure Probability in Fatigue of CFRP Laminates and P-S-N Prediction

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The statistics distributions of the fatigue lives of a woven CFRP quasi-isotropic laminate at different stress ratios are examined, and a procedure for predicting the S-N relationships that consider the influence of the probability of failure P (i.e. P-S-N relationships) is proposed. Fatigue tests are performed at different stress ratios R=0.1, 10 and R=χ≡σ_<UCS>/σ_<UTS>. To identify the statistical nature of fatigue life, the log-normal distribution and the Weibull distribution (two-parameter, three-parameter) are applied to the fatigue data obtained. The anisomorphic constant fatigue life (CFL) diagrams for different probabilities of failure (10%, 50% and 90%) are constructed on the basis of the P-S-N curves for the critical stress ratio, and it is successfully used for predicting the P-S-N relationships for different stress ratios.

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