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Get Full Access to Materials Science And Engineering: An Introduction - 9 Edition - Chapter 15 - Problem 15.6
Get Full Access to Materials Science And Engineering: An Introduction - 9 Edition - Chapter 15 - Problem 15.6

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# For some viscoelastic polymers that are subjected to ISBN: 9781118324578 140

## Solution for problem 15.6 Chapter 15

Materials Science and Engineering: An Introduction | 9th Edition

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Problem 15.6

For some viscoelastic polymers that are subjected to stress relaxation tests, the stress decays with time according to s(t) = s(0) expa - t t b (15.10) where s(t) and s(0) represent the time-dependent and initial (i.e., time 0) stresses, respectively, and t and t denote elapsed time and the relaxation time, respectively; t is a time-independent constantcharacteristic of the material. A specimenof a viscoelastic polymer whose stress relaxationobeys Equation 15.10 was suddenly pulled in tensionto a measured strain of 0.5; the stress necessaryto maintain this constant strain was measuredas a function of time. Determine Er(10) for thismaterial if the initial stress level was 3.5 MPa (500psi), which dropped to 0.5 MPa (70 psi) after 30 s.

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Anthony Lovill BE1500 Quiz 10 November 29, 2016 %This function file calculates the maximum number within a given cell %array. function [maxNum]= Quiz_10(a); [m,n]=size(a); i=1; k=1; while i<=m j=1; while j<=n c=class(a{i,j}); if strcmp(c,'double') for t=1:length(a{i,j}) vec=a{i,j}; g(k)=vec(t); k=k+1; end elseif strcmp(c,'cell') if strcmp(c,'double') for t=1:length(a{i,j}) vec=a{i,j}; g(k)=vec(t); k=k+1; end end else end j=j+1; end i=i+1; end i=1; j=2; d=length(g); while j<=d if g(i)>g(j) g(j)=g(i); g(i)=g(j); end j=j+1; i=i+1; end maxNum=g(d); disp(maxNum) >> Q

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##### ISBN: 9781118324578

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