Question

3. A structural component is fabricated from an alloy that has a plane-strain fracture toughness of 69 MPa, m (69 MPa square root of "m"). It has been determined that this component fails at a stress of 250 MPa when the maximum length of a surface crack is 1.6 mm. What is the maximum allowable surface crack length (in mm) without fracture for this same component exposed to a stress of 250 MPa and made from another alloy that has a plane strain fracture toughness of 54 MPam (54 MPa square root of "m")?

Answer 1

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i/= kic beta π 3.8929 x 250 We know that for initial crack propagation, stress is 6c = KIC Ta 69 250.J(TTX 1-6x103) -Y = 3.8929 from equation ③ maximum allowable surface crack length is given by 9 X 1 KICI? The -9 -93 0.0009799m or -0.9199 mm