一方向炭素繊維強化複合材料の室温および高温における非主軸疲労とその損傷力学的モデル化

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Effects of the temperature-dependence of matrix and fiber-matrix interface properties on the offaxis fatigue behavior of unidirectional T 800 H/Epoxy composite have been studied. Tensiontension fatigue tests were performed for seven kinds of plain coupon specimens with different fiber orientation angles at room temperature (RT) and 100℃. Using a non-dimensional effective stress defind on the basis of the classical static failure theories together with a formulation based on the continuum damage mechanics, a fatigue failure criterion was developed. The off-axis fatigue strengths at RT and 100℃ decreased as the off-axial angle increased, and they were reduced significantly as the test temperature became higher. Almost linear S-N relationships were obtained in the whole range of fatigue loading up to 10^6 cycles, irrespective of off-axis angles and test temperarures. Normalizing the maximum fatigue stress with the static strength at test temperature, the off-axis fatigue data eventually fell on a single S-N relationship which showed no apparent dependence on temperarure. This characteristic was described well by the non-dimensional effective stress which may be interpreted as a theoretical strength ratio. It was also verified that the fatigue damage mechanics model proposed can describe the observed off-axis S-N relationships and it has a potential capability in more practical fatigue failure analyses for multidirectional laminates.
一般社団法人日本機械学会の論文
1998-11-25

一方向炭素繊維強化複合材料の室温および高温における非主軸疲労とその損傷力学的モデル化

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