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Sample%20Exam%202-%202010

Sample%20Exam%202-%202010 - EMA 3010 TIME 50 MINUTES MAE B...

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EMA 3010 TIME 50 MINUTES; MAE B 211 10.40 - 11.30 am. CLOSED BOOK; ANSWER ALL QUESTIONS; FORMULAS AND CONSTANTS ARE GIVEN BELOW; YOU ARE ALLOWED TO BRI NG A CALCULATOR Hooke’s Law σ = E ε Critical resolved Shear stress = σ cos θ cos λ Fracture toughness = Y σ ( π a) 0.5 Assume Y = 1.0 1: The figure below shows the engineering tensile stress-strain behavior of alloy steel. Assume that the material has a BCC structure (a) Label (on the curve) and determine the (i) yield strength (at strain offset of 0.0025) and (ii) tensile strength of the alloy steel. Calculate the modulus of elasticity of the material. {13 points} (b) Schematically draw the true-stress strain curve of the alloy steel shown in the above figure. Estimate how many slip systems are possible in this material {10 points} (c) Name 4 methods you can use to increase the yield strength of the material. [10 points]
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(d) If the fracture toughness (K IC ) of the alloy steel is 50.0 MPa m 1/2 , calculate the maximum design stress without crack growth that can be applied if the largest flaw is 9 mm. [10 points]
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