ENGRI 111 hw6_soln

ENGRI 111 hw6_soln - Yuri Andrade Sylvester ENGRI 111...

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Yuri Andrade Sylvester ENGRI 111 December 3, 2004 Homework # 6 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 crystal of different orientations are joined together. TRUE: Because that is the definition of grain boundaries. If the crystals were of the same orientation then a grain boundary would not exist so a grain boundary exists when different orientations are joined together. (b) In a ceramic the tensile stress is 50 % greater than the yield strength. FALSE: The yield strength is always greater than tensile strength in ceramics. (c) Metals are not as brittle as ceramics because there are no cracks present. FALSE: Ceramics are more uniform and no dislocations as contrasted with metals which can have dislocations (grain boundaries). (d) Ceramics are brittle because there are no dislocations present.
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This homework help was uploaded on 02/03/2008 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell.

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ENGRI 111 hw6_soln - Yuri Andrade Sylvester ENGRI 111...

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