Materials Science And Engineering Properties
Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 9, Problem 14CQ

At temperatures above the equi-cohesive temperature, the creep mechanism of grain boundary ____________ is observed.

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1) Please indicate in the stress-strain diagram given below the stress levels that can cause creep. 2) The effect of an increase in service temperature or applied stress is to shift the 3) Dislocation density . In Region number (...) while creep deformation is increasing at an increasing rate. 4) Dislocation density is remains constant in Region number (.) while the creep rate is increasing. 5) For some applications the amount of creep in Region number (.) is taken as the design criteria.
At an axial load of 25 kN, a 50-mm-wide by 15-mm-thick polyimide polymer bar elongates 3.1 mm while the bar width contracts 0.26 mm. The bar is 220 mm long. At the 25-kN load, the stress in the polymer bar is less than its proportional limit Determine (a) the modulus of elasticity. (b) Poisson's ratio. (c) the change in the bar thickness. Answers: (a) E- (b) v- (c) Audness GPa mm
A thin plate of a ceramic material with E = 225 GPa is loaded in tension, developing a stress of 450 MPa. Is the specimen likely to fail if the most severe flaw present is an internal crack oriented perpendicular to the load axis that has a total length 0.25 mm and a crack tip radius of curvature equal to 1 μm?
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