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).
