A large crankshaft made of cast iron with fracture toughness (Kc = 50 MNm-3/2) undergoes cyclic...

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A large crankshaft made of cast iron with fracture toughness (Kc = 50 MNm-3/2) undergoes cyclic tensile stress, 250 MPa, and compressive stress, 80 MPa. Before using the material, an inspection with ultrasonic techniques was carried out and the largest surface crack was found to be 3 mm in length. For the cast iron material, the Paris law constants are (A = 1.2x10 - 12 m /(MNm-3/2)n per cycle and n = 2.5. Calculate the number of cycles to failure (Nf). Hint: This problem requires you to determine the critical crack length (af). Take Y = 1. A large crankshaft made of cast iron with fracture toughness (Kc = 50 MNm-3/2) undergoes cyclic tensile stress, 250 MPa, and compressive stress, 80 MPa. Before using the material, an inspection with ultrasonic techniques was carried out and the largest surface crack was found to be 3 mm in length. For the cast iron material, the Paris law constants are (A = 1.2x10 - 12 m /(MNm-3/2)n per cycle and n = 2.5. Calculate the number of cycles to failure (Nf). Hint: This problem requires you to determine the critical crack length (af). Take Y = 1.

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To find the number of cycles to failure Nf for the given large crankshaft made of cast iron we need ... View the full answer