ENGRI_HW6_2004 - (b The behavior of polymers is temperature...

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ENGRI 111 Homework # 6 Due Friday, December 3, 2004 1. Draw a stress/strain (engineering) curve for a typical metal and a typical ceramic. For the metal also draw the true stress/strain curve. 2. Answer a - d with true or false and explain your answer with a short sentence. (a) Grain boundaries are created when crystals of different orientations are joined together. (b) In a ceramic the tensile stress is 50 % greater than the yield strength. (c) Metals are not as brittle as ceramics because there are no cracks present. (d) Ceramics are brittle because there are no dislocations present. 3. Answer a – d with true or false and explain your answer with a short sentence. (a) The mechanical response of polymers is time dependent.
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Unformatted text preview: (b) The behavior of polymers is temperature independent. (c) Dendimers are insulators under ordinary conditions but doping at the ppm level can turn them into conducting solids. (d) Fuel cells produce electricity by breaking water into hydrogen and oxygen. 4. The following data were collected from a 0.4-in.-diameter test specimen of polyvinyl chloride. After fracture, the gage length is 2.09 in. and the diameter is 0.393 in. Plot the data and calculate a) the 0.2% offset yield strength b) the tensile strength c) the modulus of elasticity d) the % elongation Load (lb) Gage Length (in) 2.00000 300 2.00746 600 2.01496 900 2.02374 1200 2.032 1500 2.046 1660 2.070 1600 2.094 1420 2.12...
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