The Ultimate Flexural Strength of Fiber-Reinforced Ceramic Matrix Composite: A Multiscale Approach
Year: 2025
Type: article
Abstract: The paper tackles the important issue of the flexural strength of continuous fibre reinforced ceramic composite. Estimates of flexural strength of 2D woven SiC/SiC composite are extracted from symmetric and asymmetric 3-point bending test results using three independent approaches: (1) the equations of elastic beam theory for homogneous solids, (2) finite element analysis of stress-state, (3) stress-strain relations in the tensile outer surface of specimens. Furthermore, the flexural strength is predicted from the ultimate tensile strength using a bundle failure model based on the fracture of the critical filament. It is shown that the equation of elastic beam theory significantly overestimates the flexural strength of the 2D SiC/SiC (620 MPa), while the alternate approaches, and the predictions from the ultimate tensile strength converged on ≈340 MPa. The variability of strength data was approached using the construction of p-quantile diagrams that provide unbiased assessment of the normal distribution function. Pertinent Weibull parameters are derived using the 1st moment equations. Important trends in the effects of size, stress gradient, tension-flexure relations, strength of critical filament in a tow and populations of critical flaws are established and discussed.
Source: Journal of Composites Science
DOI: 10.3390/jcs9060281
Author: Jacques Lamon
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,172
OpenAlex ID: W4410898147