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 5ETSQ
To determine

The primary mechanism of creep at temperature above 0.80 of melting temperature at very low stress.

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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 20 kN, a 45-mm-wide by 10-mm-thick polyimide polymer bar elongates 3.3 mm while the bar width contracts 0.21 mm. The bar is 240 mm long. At the 20-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) Athickness= i i i GPa mm
At an axial load of 20 kN, a 35-mm-wide by 10-mm-thick polyimide polymer bar elongates 2.7 mm while the bar width contracts 0.15 mm. The bar is 240 mm long. At the 20-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.
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