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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11<br />
Objective<br />
Overview<br />
Crack<br />
Minimztn.<br />
Energy<br />
Absrptin.<br />
Distributions<br />
• Remembering that it is the largest crack that limits<br />
breaking strength, it is not the average crack length<br />
that matters but rather the maximum crack size that<br />
we should care about.<br />
• For materials in which the grain size determines the<br />
typical crack size, experience shows that the grain<br />
size distribution is approximately constant. The<br />
maximum grain size observed is a small multiple of<br />
the average - about 2.5 times.<br />
• Also important in distributions is the spatial<br />
distribution of particles (that can generate cracks);<br />
cracks at, or near the surface are more deleterious<br />
than cracks in the interior.
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