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A 8 0 mm thick steel plate contains a through - thickness edge crack 6 . 0 mm long. It is loaded in pure bending

A 80 mm thick steel plate contains a through-thickness edge crack 6.0 mm long. It is loaded in pure bending with an alternating stress of amplitude 45 MPa. The plate material has a Paris coefficient of 1\times 1011 and a Paris exponent of 3. How many cycles will it take for the crack to grow to double its length?

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