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

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18 Objective Overview Crack Minimztn. Energy Absrptin. Explanation of Lamination This crack propagation direction follows the inclusion+grain shape (less toughness) This crack propagation direction leads to delamination and crack blunting (more toughness)
19 Objective Overview Crack Minimztn. Energy Absrptin. Energy absorption: 1 • How do we increase the amount of energy consumed in propagating a crack? - One method, already discussed, is to maximize the amount of plastic work. This requires the yield strength to be minimized so as to maximize the size of the plastic zone. - For very tough materials, however, it turns out that the same parameters that control ductility also affect toughness. Lower densities of second phase particle increase toughness. Second phase particles well bonded to the matrix increase toughness. Small differences in thermal expansion coefficient help (Why?). • Read papers by Prof. Warren Garrison’s group.
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Microstructure-Properties: I Fracture Toughness - Materials Science ...

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