quiz9spr01

# quiz9spr01 - p-\ ENSC 3313, Spring 2001 Answer any 4...

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p-\ Quiz 9 ENSC 3313, Spring 2001 Name Answer any 4 Questions only, 1 point each An au grad stretched a Maxwell material and held it at constant defonnation. He forgot to record the initial stress. However, after I day (24 hours) an asu grad measured the stress to be 41 psi. After two days ( 48 hours) the stress, as measured by an asu grad, was 26 psi. Your boss fears that the experiment will need to be repeated since no initial stress data was obtained. Please demonstrate how the initial stress can be detennined. If the stress relaxation time of a polymer is 1 year at 20°C, 1 month at 40°C, what do you reckon it would be at 70°C? 2. The expectation is that the relaxation time decreases exponentially with increasing temperature, over a 'reasonably' limited temperature range. If A is the relaxation time +crr A = Aoe +C/293 365 = Aoe 31 = Aoe+{;/J1J A = 6.34 x 10-15 and In(365/31) = +C c = 11,307 t = 6.34 x lO-lSell,307/343 = U days Identify 4 different polymers ~ state an example use of each. Add explanatory comments as needed

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## This note was uploaded on 01/10/2012 for the course ENSC 3313 taught by Professor Staff during the Fall '11 term at Oklahoma State.

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quiz9spr01 - p-\ ENSC 3313, Spring 2001 Answer any 4...

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