Abstract
Effect of thermally induced stress on fracture toughness was examined using a model composite composed of unidirectionally-aligned continuous monolayer SiC fiber and glass matrix. To study the effect of relative coefficient of thermal expansion (CTE), two different kinds of composites with the condition of αfL>αm where αfL and αm denote CTEs of the fiber and matrix and L denotes longitudinal direction of the fiber, were fabricated by changing CTE of the matrix. The fracture toughness of the composite was obtained from pop-in load, which corresponded to initial matrix cracking at the notch root. It was found that the fracture toughness of the composite increased with increase the longitudinal thermally induced compressive stress in the matrix and the result is explained by simple theoretical analysis. The result suggests that the thermally induced compressive stress in the matrix is a key mechanism increasing the fracture toughness of the fiber-reinforced ceramic matrix composites.
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