where σ(t) and σ(0) represents the time-dependent and initial (i.e., time =0) stresses, respectively, and t and τ denote elapsed

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where σ(t) and σ(0) represents the time-dependent and initial (i.e., time =0) stresses, respectively, and t and τ denote elapsed

time and the relaxation time; τ is a time-independent constant characteristic of the material. A specimen of some viscoelastic polymer with the stress relaxation that obeys equation above was suddenly pulled in a tension to a measured strain of 0.42; the stress necessary to maintain this constant strain was measured as a function of time. Determine Er(7) for this material if the initial stress level was 3.1 MPa (440 psi), which dropped to 0.30 MPa (43 psi) after 52 s.

Engineering

1 answer:

artcher [175] · Answer 1 · 2022-01-10T10:06:28+03:00

Answer:

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Explanation: