Proposal of the Prediction Method Using a Competing Risk Model on the Bending Strength of 2D-C/C Composites

Bending strength of a 2D-C/C composite was studied by experimental and theoretical approaches, and the prediction method on the basis of stress-related fracture mode was proposed. In the experiment, three-point bending test and observation of fracture surface were carried out to clarify the stress-related fracture modes. From the fracture surface observation, three kinds of fracture modes were identified: the compressive, tensile and the shear fracture modes. In the theoretical approach, the Weibull strength theory and the proposed method were applied to estimate the bending strength prediction. As a result of this study, it was found that the proposed method is applicable to the bending strength prediction of the 2-C/C composite, whereas the Weibull strength theory is not applicable.