Natural rubber is tested in tension to a maximum extension ratio of λ = 3. The Mooney-Rivlin constants for this material are found to be C1 = 0.069 MPa and C2 = 0.125 MPa. Plot the corresponding uniaxial stress vs. extension ratio behavior over the tested range. Derive an expression for the slope of the function, then determine the secant and tangent moduli at 100% strain.

Elements Of Electromagnetics
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Natural rubber is tested in tension to a maximum
extension ratio of λ = 3. The Mooney-Rivlin constants for
this material are found to be C1 = 0.069 MPa and C2 = 0.125
MPa. Plot the corresponding uniaxial stress vs. extension
ratio behavior over the tested range. Derive an expression for
the slope of the function, then determine the secant and
tangent moduli at 100% strain.

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