(Solution) - If the strain rate in a polymer can be represented -(2025 Original AI-Free Solution)

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If the strain rate in a polymer can be represented by the following equation:
d?/dt = ?/? + (1/E) d?/dt
Where ? = strain, ? = stress, ? = viscosity, E = modulus of elasticity, and t = time, derive Equation 16-5, assuming constant strain (i.e., d? = 0). What is the relaxation time (?) in Equation 16-5 a function of?