4 the resistance curve the resistance curve of a brittle material fits
4. The resistance curve
The resistance curve of a brittle material fits the expression:
where K, and ß are material parameters. Consider the effects of small cracks in a body
designed to carry a fixed stress level o. Assume that the stress intensity factor is given
(a) Obtain the critical crack size ac for initiation.
(b) Determine the relationship between Ko and B to ensure that this critical crack is
(c) Discuss the implication of increasing Ko.
(d) Discuss the implication of increasing B.
(e) Discuss the implication of increasing the design stress
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