Part of the required input to the viscoelastic option in some finite element codes is a table showing the time-dependent, isotropic shear modulus \(G(t)\) at different times \(t\). Explain how you would generate such a table from tensile isochronous stress-strain curves such as the ones in Figure 8.28. Include the key equations and a list of assumptions in your explanation.

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FIGURE 8.28 Stress level (MPa) 5 15 20 20 0.5 1.0 1 h 10 h 100 h 1000 h 5000 h 10,000 h 100,000 h projected ----- 1.5 Total strain, % at indicated stress and time mm/mm or in./in. x 100 2.0 2.5 0.5 1.0 1.5 2.0 3.0 2.5 Stress level (103 psi)