hw2 - Yield strength 25,000 psi(175 MPa Tensile strength...

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M E 363 Homework No. 2 Name Due: 9/20/2011 1. The following data are collected during a tensile test in which the starting gage length =5.0 in. and the cross sectional area=0.1 in 2 . Load 0 4000 5180 6200 6500 6200 4600 Length 0 5.009 5.25 5.6 5.88 6.12 6.4 The maximum load is 6500 lbs and the final data point occurred immediately prior to failure. (a) Plot the engineering stress-strain curve and the true stress-strain curve. (b) Determine the yield strength Y and modulus of elasticity E. (c) Determine the tensile strength TS. (d) Determine the strength coefficient, K, and the strain hardening exponent. Be sure not to use the data after the necking point. 2. A tensile test for an aluminum alloy yielded the following data: Modulus of elasticity 10 × 10 6 psi (69 × 10 3 MPa)
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Unformatted text preview: Yield strength 25,000 psi (175 MPa) Tensile strength 50,000 psi (350 MPa) Strength coefficient, K 60,000 psi (400 MPa) Strain hardening index, n 0.15 The fracture occurred when ε =0.35. (a) Determine the resilience. (b) Calculate the value of ductility. (c) Determine the value of toughness. 3. Hardness problem (see Figure 2.12 in the textbook) (a) Solve textbook 2.54. (b) Solve textbook 2.57. 4. A bar 0.5 m long is stretched to the strain of 0.12 and then stress relieved. The yield stress of this material is 600 MPa and E=200 GPa. The plastic deformation is described by the strain hardening equation σ = K ε n with K=760 MPa and n=0.2. Determine the length of the bar after the external stress is relieved....
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