2012HW#1 Assignment(1)
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ME 3227 Elements of Machine Design Homework #1, Due on Thursday, January 31, 2013 1. Determine the tensile and yield strengths for the following materials: (a) UNS G10150 hot-rolled steel (b) SAE 1045 cold-drawn steel (c) AISI 1141 steel quenched and tempered at 540 C (d) 2011-T6 aluminum alloy (e) Ti-6 Al-6 V-2Sn annealed titanium alloy 2. The stress-strain data from a tensile test on a cast-iron specimen are. Engineering stress, kpsi 5 10 16 19 26 32 40 46 49 54 Engineering strain, ×10 -3 in/in 0.2 0 0.4 4 0.8 0 1.0 1.5 2.0 2.8 3.4 4.0 5.0 Plot the stress-strain locus and find the 0.1 percent offset yield strength, and the tangent modulus of elasticity at zero stress and at 20 kpsi. 3. A part made from annealed AISI 1018 steel undergoes a 20 percent cold-work operation. (a) Obtain the yield strength and ultimate strength before and after the cold-work operation. Determine the percent increase in each strength. (b) Determine the ratios of ultimate strength to yield strength before and after the cold-work operation. What does the result indicate about the change of ductility of the part? 1
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home work One
Transcript of 2012HW#1 Assignment(1)
ME 3227 Elements of Machine Design
Homework #1, Due on Thursday, January 31, 2013
1. Determine the tensile and yield strengths for the following materials:(a) UNS G10150 hot-rolled steel(b) SAE 1045 cold-drawn steel(c) AISI 1141 steel quenched and tempered at 540 C(d) 2011-T6 aluminum alloy(e) Ti-6 Al-6 V-2Sn annealed titanium alloy
2. The stress-strain data from a tensile test on a cast-iron specimen are.
Engineering stress, kpsi 5 10 16 19 26 32 40 46 49 54Engineering strain, ×10-3 in/in 0.20 0.44 0.80 1.0 1.5 2.0 2.8 3.4 4.0 5.0
Plot the stress-strain locus and find the 0.1 percent offset yield strength, and the tangent modulus of elasticity at zero stress and at 20 kpsi.
3. A part made from annealed AISI 1018 steel undergoes a 20 percent cold-work operation. (a) Obtain the yield strength and ultimate strength before and after the cold-work operation.
Determine the percent increase in each strength. (b) Determine the ratios of ultimate strength to yield strength before and after the cold-work
operation. What does the result indicate about the change of ductility of the part?
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