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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43<br />
Objective<br />
Overview<br />
Crack<br />
Minimztn.<br />
Energy<br />
Absrptin.<br />
Lab 2: points of interest<br />
• Consider the following items in the (second) Lab.<br />
• Relate the fracture morphology of wood to what we discussed<br />
in this lecture concerning laminated composites.<br />
• Can you detect changes in fracture morphology as a function of<br />
test temperature (steels)? Can you relate the fracture surface<br />
features to the measured grain size? What about the spacing<br />
of the pearlite colonies (depending on the microstructure)?<br />
• Can you detect changes in fracture morphology as a function of<br />
microstructural change? For example, in the normalized<br />
(pearlitic) condition, can you detect the lamellae at the fracture<br />
surface? Do you think that there is any interaction between the<br />
fracture process and the lamellar structure?<br />
• For the quench+tempered condition, can you relate the particle<br />
(carbide) spacing to features on the fracture surface?<br />
• For the martensitic condition, can you estimate the energy that<br />
should be absorbed if it goes only towards creating crack<br />
surface? How does this number compare with a reasonable<br />
surface energy for iron?
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