ENGRI_HW7_soln_2006

ENGRI_HW7_soln_2006 - ENGRI 111 Homework # 7 Solutions Due...

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ENGRI 111 Homework # 7 Solutions Due Monday, December 4, 2006 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. The green line is a typical stress strain curve for a ceramic. The red line is a typical engineering stress strain curve for a metal, and the blue line is the corresponding true stress strain curve. Strain Stress
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2. Answer a - k 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. True, but the crystals must be identical. The grains of a polycrystalline ceramic or metallic material are essentially crystals of different orientations joined together along surfaces or interfaces called grain boundaries. True, but the crystals must be identical. b) In a ceramic the tensile stress is 50 % greater than the yield strength. False, ceramics do not plastically deform (like metals) and hence do not have a yield strength. c)
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This homework help was uploaded on 09/23/2007 for the course ENGRI 1110 taught by Professor Giannelis during the Spring '07 term at Cornell.

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ENGRI_HW7_soln_2006 - ENGRI 111 Homework # 7 Solutions Due...

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