Question

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Problem 1 (50 points) Stress Strain Curve Three steel bars with a diameter of 0.5 in, and carbon content of 0.2, 0.5, and 0.8%, respectively The specimens were subjected to tension until rupture. The load versus deformation results were as shown in the table below If the gauge length is 2 in., determine the following a. The tensile stresses and strains for each specimen at each load increment, b. Plot stress-strains for all specimens on same graph C. Determine the 0.2% offset yield strength for each specimen d. The proportional limit for each specimen. e. The modulus of elasticity of each specimen. f. The strain at rupture for each specimen g. The ultimate strength for each specimen. h. The modulus of resilience for each specimen. i. The modulus of toughness for each specimen j. Comment on the effect of increasing the carbon content on the yield strength, modulus of elasticity and ductility Specimen No Carbon Content (%) Deformation (in.) 0.000 0.003 0.004 0,006 0.020 0.040 0.100 0.200 0.300 0.400 0.500 0.550 | 0.2 0.5 0.8 Loads (ki 0 31 31 32 34 32 46 47 46 75 89 104 114 (Rupture) 46 52 68 78 79 71 (Rupture 51 46 (Rupture

Answer 1

specimen 2 500 450 400 350 300 250 200 150 Series "specimen 2 Point "0.25 (0.25, 361.6912888 specimen 100 50 0 0.05 0.1 0.150.2 0.25 0.3