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(Solved): 1.2 Consider stress relaxation experiments conducted at different step strain levels. Denote the str ...
1.2 Consider stress relaxation experiments conducted at different step strain levels.
Denote the stress relaxation curves by G(t,\epsi ).
(a) Show that, if the stress relaxation response allows linear scaling,
G(t,\epsi )=\epsi G(t).
(b) Show how the stress relaxation isochrones are constructed from the data.
Describe their shape for a material which displays linear scaling. How do
the isochrones vary as time increases?
*1.3 Figure 1.17a shows a creep data for rayon laminate. Plot isochrones for 100 ,
200,400,600,800 hours. Is there a range in which linear scaling is possible?
Figure 1.17a. Creep for tension creep tests of tayon laminate for 1,000hr at constant load. Temperature
77\deg F; relative humidity, 50% (Findley and Worley 1948).