The acrylic polymer from which Figure was obtained is subjected to an alternating stress between 15 MPa and 0 MPa. The largest surface cracks initially detected by nondestructive testing are 0.001 mm in length. If the critical fracture toughness of the polymer is 2 MPa , calculate the number of cycles required before failure occurs. Let f = 1.0. (Hint: Use the results of Problem 7-40.)
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