平織擬似等方 CFRP 積層板のランダム疲労寿命予測

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  • Fatigue Life of Quasi-Isotropic Woven CFRP Laminates Under Random Loading

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Effects of random R-ratio loading on fatigue life of a quasi-isotropic woven fabric CFRP laminate have been studied. A new methodology for generating random R-ratio loading is first developed with the help of the anisomorphic constant fatigue life diagram approach. In this random fatigue testing, the different R-ratio waveforms with different stress levels are randomly generated under the condition that they have the same fatigue life, and a block of the generated waveforms are repeatedly applied to specimens of the composite. The random loading tests with equal-life but different stress ratios waveforms demonstrate that the fatigue life from the experiments is much shorter than the constant value of life that was specified for generation of the random waveform assumed in the test. This suggests a strong interaction between the waveforms consecutively applied. The Miner rule is excessively optimistic for the random R-ratios loading. In contrast, the use of the Miner rule in conjunction with the rain flow method allows much better prediction with an accuracy of a factor of two.

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