2. An industrial component is made of a metallic material for which the fracture toughness (Kc)...
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2. An industrial component is made of a metallic material for which the fracture toughness (Kc) is 54 MPa.m¹/2 The component contains long surface cracks up to 2 mm deep, and the crack-growth rate under cyclic loading is given by the Paris Law: da dN=A(AK)³ where A = 6 x 10-¹2 m (MPa.m¹/2)-3. This component is subjected to an alternating stress of range of 180 MPa and a mean tensile stress of 90 MPa. Assuming that the geometrical factor is 1.12, estimate the number of cycles to failure. 2. An industrial component is made of a metallic material for which the fracture toughness (Kc) is 54 MPa.m¹/2 The component contains long surface cracks up to 2 mm deep, and the crack-growth rate under cyclic loading is given by the Paris Law: da dN=A(AK)³ where A = 6 x 10-¹2 m (MPa.m¹/2)-3. This component is subjected to an alternating stress of range of 180 MPa and a mean tensile stress of 90 MPa. Assuming that the geometrical factor is 1.12, estimate the number of cycles to failure.
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