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A 50 mm wide sample plate of 7074-T8 aluminium alloy contains a central through-crack of length 2a (KIC = 22.2 MNm-3/2, = 520 MPa).

A 50 mm wide sample plate of 7074-T8 aluminium alloy contains a central through-crack of length 2a (KIC = 22.2 MNm-3/2, = 520 MPa). Determine the critical half crack- length, ac, which the plate will not fracture under the applied stress (Take Y=1). = 200 MPat W= 50 mm 10 2a = 200 MPa

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