A 1047 steel plate is subjected to a tensile stress of 120 MPa. Given its fractu

Question

A 1047 steel plate is subjected to a tensile stress of 120 MPa. Given its fracture toughness is
45 MPam and Y = 1,
(a) Determine the critical crack length to assure the plate will not fail under static loading.

(b) Consider the same plate under the action of cyclic tensile/compressive stresses of 120
MPa and -30 MPa, respectively. If the component is to remain safe for 10 million cycles, what
is the largest allowable crack length?

(c) Compare the two critical crack lengths in (a) and (b), comment on the effect of the type of
loading on critical crack length.

Explanation / Answer

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