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Failure Mechanisms | |||||||||||||||||
Plasticity
Effects
· In
most materials some plastic
deformation occurs at the propagating crack tip and plastic deformation
work must be included in the overall energy.
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From:
Barrett, Nix, and Tetelman,
"The Principles of Engineering Materials," Prentice Hall (1973) |
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· When plastic deformation work is involved in rapid fracture, a region about 10-6m thick on either side of the crack surface is plastically deformed and the plastic work is much larger than the surface energy. For this condition: Ω= (P + S) ~ P. | |||||||||||||||||