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

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22 Objective Overview Crack Minimztn. Energy Absrptin. 1 Crack deflection • If particles of a second phase are present, large differences in elastic modulus can either attract or repel the crack. • Some authors (e.g. Green) distinguish between crack bowing and crack deflection. Technically, the former is toughening from deflection in the plane of the crack and the latter is deflection out of the plane of the crack. • In either case, the net result is that the crack tip no longer sees as large a stress as it would if the crack were straight, and in the plane. • Crack deflection can be caused by particles that are more resistant to cracking, or have different elastic stiffness (higher or lower modulus). • Laminate composites also achieve crack deflection, as previously discussed.
23 Objective Overview Crack Minimztn. Energy Absrptin. 1. Crack deflection: examples [Green]
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Microstructure-Properties: I Fracture Toughness - Materials Science ...

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