The high-strength steel in Figure, which has a critical fracture toughness of 80 MPa , is subjected to an alternating stress varying from –900 (compression) to +900 MPa (tension). It is to survive for 105 cycles before failure occurs. Assume that f = 1. Calculate
(a) the size of a surface crack required for failure to occur; and
(b) the largest initial surface crack size that will permit this to happen.
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