Microstructure-Properties: I Fracture Toughness - Materials Science ...

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38 Objective Overview Crack Minimztn. Energy Absrptin. 3B Fiber/ligament bridging (Composites) • Anything that results in a load bearing link across the crack (behind the tip) decreases the stress (intensity) at the crack tip. • Either rigid (elastic) fibers (ceramic matrix composites) or plastic particles (ductile metal particles in an elastic matrix) are effective. • In order to estimate the increase in toughness, one can calculate a work associated with crack advance and then estimate with ∆K = √(EG). [Chiang]
39 Objective Overview Crack Minimztn. Energy Absrptin. 3B Fiber/ligament bridging • Scanning electron micrographs of a SiC whisker bridging at various stages of crack opening. From left to right, the stress intensity is increasing. [Green]
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Microstructure-Properties: I Fracture Toughness - Materials Science ...

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