A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 82.4MPa(75.0ksi). If the plate is exposed to a tensile stress of 345 MPa (50,000 psi) during service use, determine the minimum length of a surface crack that will lead to fracture. Assume a value of 1.0 for Y.

Given:

plane strain fracture toughness=

tensile stress =

we know the formula:

Rearranging the formula

inserting values in formula

simplifying we get

the answer is b

explanation:

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