Q1: Choose the correct answer for the following questions: 6_fracture stress (a) is proportional to (a) crack length (b) 1/crack length (c) (crack length)(crack length) 7_racture toughness is measured in terms of (a) Strain energy release rate (b) Stress concentration factor (c) Both (d) None 8_In fracture mode-11, fracture surfaces.. (a) shear parallel to edge of crack (b) shear per pendicular to edge of crack (c) displace normal to each other 9_fracture toughness, Kic, decreases with.... (a) increasing temperature (b) increasing strain rate (c) increase in yield strength (d) increase in grain size(d) None 10_lf the surface crack causing fracture in a brittle material is made twice as deep, the fracture strength will.... decrease by a factor of V2 (b) decreases by a factor of 2 (c) decrease by a factor of 2 (d) No change Q2: A material containing cracks of initial length 0.01 mm is subjected to alternating tensile stresses

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