For which of the following conditions, as long as the stress (s) is less than ab

Question

For which of the following conditions, as long as the stress (s) is less than about 60 percent of the yield stress (sy), is the plastic zone smaller than the K-field?.

1. a pre-existing crack should not undergo extension as long as the stress intensity factor (KI) does not exceed the fracture toughness (KIC) for the material

2. a crack that is not pre-existing will form in the geometric center of the material (F)

3. a pre-existing crack will propagate but catastrophic failure should not occur

4. the material will not experience any thermal stresses due to differential temperatures across the material thickness

Explanation / Answer

Answer:   A pre-existing crack should not undergo extension as long as the stress intensity factor (KI) does not exceed the fracture toughness (KIC) for the material.   A pre-existing crack should not undergo extension as long as the stress intensity factor (KI) does not exceed the fracture toughness (KIC) for the material.

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