Engineering 45 Lab 5

# Engineering 45 Lab 5 - Questions 1 2 2024-T3-Al(a 0.2...

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Questions : 1.) 2.) 2024-T3-Al (a) 0.2% offset = 3.28 psi (b) UTS = 3060 psi / .044 in 2 = 69545.45 psi/in 2 (c) Fracture Stress = 3030 psi / .038 in 2 = 79736.84 psi/in 2 (d) %RA = (.044 - .038) / .044 × 100 % = 13.63% (e) % total elongation = (1.883 – 1.655) / 1.655 × 100% = 13.78% (f) Toughness = 1020 in-lb·f/in 2 (g) Young’s Modulus = (2010 – 3.25) / (.0342 - .00368) = 65751.97 psi 1018-Mild Steel (a) Lower yield strength = 2370 psi (b) UTS = 3300 psi / .045 in 2 = 73333.33 psi/in 2 (c) Fracture Stress = 2140 psi / .013 in 2 = 164615.38 psi/in 2 (d) %RA = (.045 - .013) / .045 × 100 % = 71.11% (e) % total elongation = (2.265 – 1.704) / 1.704 × 100% = 32.92% (f) Toughness = 1920 in-lb·f/in 2 (g) Young’s Modulus = (2580 – 3.05) / (.0363 - .00771) = 90134.66 psi 4340-High Steel (a) Lower yield strength (no visible one, so strength right after the onset of plastic deformation) = -1.21 psi (b) UTS = 9010 psi / .044 in 2 = 204772.73 psi/in 2 (c) Fracture Stress = 9010 psi / .044 in 2 = 204772.73 psi/in 2 (d) %RA = (.044 - .044) / .044 × 100 % = 0% 1

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(e) % total elongation = (1.162 – 1.16) / 1.16 × 100% = .17%
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Engineering 45 Lab 5 - Questions 1 2 2024-T3-Al(a 0.2...

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