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Next, given that the strain as a function of time during the creep test using a unit step stress function for the model shown in Figure 1 is described as: e(t) = = 09) (1 1- E2 E1 + E2 .e e 1) where creep time constant (T ) is expressed as: n n τ = + E.E2 and the stress as a function of time during the stress relaxation test using a unit step strain function described as: o(t) = £o (E1 + Eze = (1) where relaxation time constant (T) is expressed as: n T = E2
= d) Sketch stress vs time curve for a relaxation test. The strain ε = 20 is applied at t = 0 and held constant over time. [Excel can be used for plotting] Eo t. to 1. Calculate the value of relaxation time constant. 2. What is the stress response at t = 0 3. What is the stress response at t = = = 0