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