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01-01ChapGere.0014 - Stress(MPa Strain 8.0 0.0032 17.5...

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Problem 1.3-7 The data shown in the accompanying table were obtained from a tensile test of high-strength steel. The test specimen had a diameter of 0.505 in. and a gage length of 2.00 in. (see figure for Prob. 1.3-3). At fracture, the elongation between the gage marks was 0.12 in. and the minimum diameter was 0.42 in. Plot the conventional stress-strain curve for the steel and determine the proportional limit, modulus of elasticity (i.e., the slope of the initial part of the stress-strain curve), yield stress at 0.1% offset, ultimate stress, percent elongation in 2.00 in., and percent reduction in area. 14 CHAPTER 1 Tension, Compression, and Shear Problem 1.3-6 A specimen of a methacrylate plastic is tested in tension at room temperature (see figure), producing the stress-strain data listed in the accompanying table. Plot the stress-strain curve and determine the proportional limit, modulus of elasticity (i.e., the slope of the initial part of the stress-strain curve), and yield stress at 0.2% offset. Is the material ductile or brittle?
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Unformatted text preview: Stress (MPa) Strain 8.0 0.0032 17.5 0.0073 25.6 0.0111 31.1 0.0129 39.8 0.0163 44.0 0.0184 48.2 0.0209 53.9 0.0260 58.1 0.0331 62.0 0.0429 62.1 Fracture Solution 1.3-6 Tensile test of a plastic Using the stress-strain data given in the problem statement, plot the stress-strain curve: s PL 5 proportional limit s PL < 47 MPa Modulus of elasticity (slope) < 2.4 GPa s Y 5 yield stress at 0.2% offset s Y < 53 MPa Material is brittle , because the strain after the proportional limit is exceeded is relatively small. — 20 40 60 Stress (MPa) 0.01 0.02 0.03 0.04 Strain 0.2% offset slope ≈ 40 MPa 0.017 = 2.4 GPa s Y s PL TENSILE-TEST DATA FOR PROBLEM 1.3-7 Load (lb) Elongation (in.) 1,000 0.0002 2,000 0.0006 6,000 0.0019 10,000 0.0033 12,000 0.0039 12,900 0.0043 13,400 0.0047 13,600 0.0054 13,800 0.0063 14,000 0.0090 14,400 0.0102 15,200 0.0130 16,800 0.0230 18,400 0.0336 20,000 0.0507 22,400 0.1108 22,600 Fracture A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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