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2. If the fracture toughness for 304L austenitic stainless steel is determined to be 20 √ , would you expect the crack identified in Question 1 to be under elastic or inelastic stress? Would you expect the crack to grow (on set of crack extension) under the calculated conditions. Include a discussion justifying your conclusion. Disregard any material properties expected due to operational life in a high flux environment and assume steady state temperature and pressure environments. (5 pts)
The crack will not grow because the calculated stress intensity is less than the fracture toughness value for the material. Since the crack is not growing, no deformation is occurring in the region of the crack tip, therefore the crack must be under elastic stress. However, given that the crack exists, at some previous time a localized stress was sufficient to cause some plastic deformation such that the crack formed and opened to its present state, so at some time in the past the crack region did experience inelastic stress....
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