d.N A fatigue crack growth test is being carried out on a large steel plate containing a 2 mm edge crack. The growth of cracks can be well represented by the Paris Law da= A(AK)*, where A is a constant (4= 6.6 × 10-¹³ (MPa) m cycle") and 4K = Kmax-Kin. If the plate is subjected to a fatigue stress for which max 120 MPa and a ratio R = -0.25 (R=Gmin/max) at a frequency of 2 Hz (2 cycles per second), how long will the crack grow to after 10 hours? and K for the edge crack is K = 1.12 o√(na) Note that: da 1 1 (4-4-4 —— a, (A) 2.6 mm (B) 3 mm (C) 7.2 mm (D) 8 mm (E) 10 mm

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Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.