Question

The creep compliance of a polymer is given below. A specimen of polystyrene is loaded in creep with a stress of 10MPa for 25hours and 30MPa for an additional 25hours and then unloaded. What is the creep strain after 75hours?

t (hours) J(t) MPa-1
0 1.0 x 10-3
25 1.4 x 10-3
50 1.6 x 10-3
75 1.7 x 10-3

t (hours) Stress MPa
0 10
25 30
50 0

ϵ (75hours):
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