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Micromechanical model for prediction of fatigue limit of fibre composites

Bent F. Sørensen's picture

We have published a paper called "Micromechanical model for prediction of the fatigue limit for unidirectional fibre composites" in Mechanics of Materials. See the link here.

The model shows that the change in the debond crack tip stress intensity factor is zero if there is a sticking friction zone at the debond crack tip. This has very important consequences, implying that cyclic crack growth of the Paris–Erdogan type cannot occur. With sticking friction at the tip of the debond no cyclic crack growth is expected under cyclic loading. This explains experimental observations.

An equation is given for the prediction of a fatigue limit expressed in terms of maximum strain as a function of basic composite and interface parameters.

Model predictions, based on independent micromechanical experiments, show that the fatigue limit will increase for higher R-ratio. This prediction is consistent with the experimental findings. Also, the model predicts that the fatigue limit will decrease with increasing fibre volume fraction. This prediction is also consistent with the experimental findings.

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