ENGRI111_HW6_Solutions

ENGRI111_HW6_Solutions - ENGRI 111 Homework #6 Solutions 1....

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ENGRI 111 Homework #6 Solutions 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 . True. Grain boundaries are defined as the interface at which identical crystals of different orientations meet. (b) In a ceramic the tensile stress is 50 % greater than the yield strength . False. Ceramics don’t show plastic deformation like metals, in which a maximum in the stress is present before failure. (c) Metals are not as brittle as ceramics because there are no cracks present. False. Any material (including metals) with no cracks would still be brittle if the presence of dislocations is absent. (d) Ceramics are brittle because there are no dislocations present. False. Ceramics are brittle even though there are dislocations. These dislocations
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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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ENGRI111_HW6_Solutions - ENGRI 111 Homework #6 Solutions 1....

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