A Numerical Simulation on Strength of Si-Ti-C-O Fiber Bonded Ceramics

Abstract

The failure process of the Si-Ti-C-O fiber bonded ceramic material was investigated under tensile and flexural loading conditions. Tensile and three-point bending tests showed the significant difference between the failure modes caused under the two types of loading. The tensile failure process was calculated using a Monte-Carlo simulation method based on a Shear-Lag model. The calculation successfully predicted the distribution of the tensile strength of the Si-Ti-C-O fiber bonded ceramic material. The finite element method was employed for calculating the failure process of the Si-Ti-C-O fiber bonded ceramic material under three-point bend loading, where the statistic properties of the tensile strength obtained from the above Monte-Carlo simulation was taken into account. The calculated load-deflection response and failure processes were in quite good agreement with the experimental data. Furthermore, the discrepancy in the distribution of the strength calculated was found under tensile and three-point bend loading conditions;the larger Weibull shape parameter and the smaller average value in the tensile strength than in the flexural strength were successfully assessed through the calculations. Finally, the effect of the interlaminar shear strength on the strength and its distribution was discussed under bend loading.