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heeeeeelp please.

I am new here and hope to find a solution and an easy to understand explanation to my problem. Thank you all

a. A specimen corresponding to a finite plate of width W = 65 mm is made from a steel with a yield strength of 650 MN m^-2 and contains an edge crack 8.5 mm long. A fracture toughness test is carried out on this specimen, and a failure stress of 295 MN m^-2 is measured. Determine the value of fracture toughness (K IC), for this particular steel.

b. A steel similar to the one used during the fracture toughness test described in part (a) is used to manufacture a large component that can be considered to be equivalent to an infinite plate. If the maximum stress that the component can be subjected to is 30 % of the yield strength, determine:

i. wheather a crack that has grown by fatigue to 12 mm long is acceptable

ii. at what length the growing crack exceeds the safety factor

Thank you

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# Value of fracture toughness for a finite plate

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