Next Given That The Strain As A Function Of Time During The Creep Test Using A Unit Step Stress Function For The Model 1 (74.31 KiB) Viewed 45 times
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: 00 e(t) = = C) (1 1 - E2 E1 + E2 ..e where creep time constant (T ) is expressed as: n η T = + E1 E2 and the stress as a function of time during the stress relaxation test using a unit step strain function described as: o(t) = 60 (Ez + Eze 1) where relaxation time constant (T) is expressed as: n τ = E2
Given Ei = 35 GPa, E2 = 28 GPa, n = 140 GPa.s = = c) Sketch the strain vs time response for a creep test. The stress o = 30 MPa is applied at t = 0 and held constant for t1 = 140 seconds (as shown in the below figure). [Excel can be used for plotting) To to ti 1. Calculate the value of creep time constant. 2. What is the strain response at t = 0 3. What is the strain response at t1 4. What is the strain response at t = 0
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