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Show transcribed image text 1 Explain Material Index with few meaningful sentences 10 points 2 Figure showed a panel supported at its edges carrying a specified central load The width b and span

Show transcribed image text 1. Explain Material Index with few meaningful sentences (10 points) 2. Figure showed a panel supported at its edges, carrying a specified central load. The width b and span L are fixed, but we are free to choose the thickness h. The objective is to minimize the mass. Reducing the thickness reduces the mass, but it must be sufficient for the maximum stress to be below the elastic limit. Determine the material Index. Show all works (step by step, no jump) for full credit. 3. For the tensile testing using ductile metallic material, specimen is getting thinner n transverse direction as it is being elongated in longitudinal direction. Explain why. You may use diagram(s) to support your answer. Your answer should have mechanism of ductile metal deformation under tension including, but not limited to, direction of deformation with respect to loading direction. (30 points) 4. Al alloy cube that has side length 1 cm contains a dispersion of hard particles of diameter 10^-8 m and average center-to-center space of 6 X 10^-8 m. Alloy has E= 70 GPa, b=0.286nm, dislocation density of 10^8 mm/mm3 and grain size of 1 pm. Contribution of grain boundary strengthening of same alloy with grain size of 10 Mu m is 20 MPa For the material above, determine total contribution of strengthening

 

Jun 21 2020 View more View Less

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