The following data are obtained from the Charpy impact test of a copper specimen. a) Length of the square cross-section specimen = 70 mm b) Each side (top & bottom) of the cross-section = 9.64 mm e)V- Notch thickness at middle of the specimen length = 1.06 mm d) Impact Strength = 279 kJ/m? Determine the Cross-sectional area at the top surface, Cross-sectional area at notch & Impact energy of the copper specimen. Solution: 1. Cross sectional area at the top surface 92.9296mm^2 2. Cross-sectional area at notch 82.7112mm^2 3. Impact Energy 23.0764248J

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Question 4 Save Answer You do a series of tensile tests on plates of a magnesium alloy that have been subjected to prior cold rolling to true plastic strains of 0.1, 0.2 and 0.3. The resulting true stress-true strain curves are shown below (including a zoomed in version expanding on the small strain region). It is reasonable to approximate the the 0.2% offset yield strength of the magnesium as ✓ MPa for 0.2 and ✓ MPa for 0.3. Assuming the yield strength is ✓ MPa for 0.1 plastic strain, proportional to the square root of the prior true plastic strain results in a hardening coefficient of approximately k= MPa. Hence, we can predict that we need a prior plastic strain of approximately True Stress (MPa) True Stress (MPa) True Stress (MPa) 250 200 150 100 50 0 0.00 250 200 150 100 50 0 0.00 250 200 150 100 50 0 0.00 Ep = 0.1 0.01 Ep=0.2 0.01 Ep=0.3 0.01 0.02 True Strain 0.02 0.03 0.02 0.03 True Strain 0.03 0.04 0.04 0.04 True Stress (MPa) 0.05 0.000 0.001 True Stress (MPa) Ep=0.1 True…

3. A cylindrical specimen of cold-worked copper has a ductility, %EL. If its cold-worked radius is d, what was its radius before deformation? Use %EL=25%; d = 10mm Ductility (%EL) 70 60 50 40 30 20 Brass 1040 Steel 10 Copper 0 0 10 110 20 30 40 50 60 70 Percent cold work