High-extension properties of polyurethane elastomers-effects of variation of the ester isocyanate ratio

Delides, C.G.; Pethrick, Richard A.

doi:10.1002/pen.24134

Cited by 2 publications

(2 citation statements)

References 34 publications

(46 reference statements)

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“…where λ u is the uniaxial stretch and P u is the nominal stress. However, y(1/λ u ) is not constant in experiments but has a slope in the order of 1/10-depending on the polymer; polyurethane elastomers may have slopes of the order of C 1 or even 10 times C 1 [31]. Mooney's solution has been to incorporate such slope by adding a C 2 term…”

Section: The Orientationally Non-affine Chain Stretchmentioning

confidence: 99%

“…The Neo-Hookean model results in a constant in the Mooney

plot

where

is the uniaxial stretch and

is the nominal stress. However,

is not constant in experiments but has a slope in the order of

—depending on the polymer; polyurethane elastomers may have slopes of the order of

or even 10 times

[ 31 ]. Mooney’s solution has been to incorporate such slope by adding a

term

using the Rivlin’s Cauchy–Green tensor invariants

, the strain energy is

…”

Section: The Orientationally Non-affine Chain Stretchmentioning

confidence: 99%

See 1 more Smart Citation

Using the Mooney Space to Characterize the Non-Affine Behavior of Elastomers

Moreno-Corrales,

Sanz-Gómez,

Benítez

et al. 2024

Materials

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The formulation of the entropic statistical theory and the related neo-Hookean model has been a major advance in the modeling of rubber-like materials, but the failure to explain some experimental observations such as the slope in Mooney plots resulted in hundreds of micromechanical and phenomenological models. The origin of the difficulties, the reason for the apparent need for the second invariant, and the reason for the relative success of models based on the Valanis–Landel decomposition have been recently explained. From that insight, a new micro–macro chain stretch connection using the stretch tensor (instead of the right Cauchy–Green deformation tensor) has been proposed and supported both theoretically and from experimental data. A simple three-parameter model using this connection has been suggested. The purpose of this work is to provide further insight into the model, to provide an analytical expression for the Gaussian contribution, and to provide a simple procedure to obtain the parameters from a tensile test using the Mooney space or the Mooney–Rivlin constants. From different papers, a wide variety of experimental tests on different materials and loading conditions have been selected to demonstrate that the simple model calibrated only from a tensile test provides accurate predictions for a wide variety of elastomers under different deformation levels and multiaxial patterns.

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Section: The Orientationally Non-affine Chain Stretchmentioning

confidence: 99%

“…The Neo-Hookean model results in a constant in the Mooney

plot

where

is the uniaxial stretch and

is the nominal stress. However,

is not constant in experiments but has a slope in the order of

—depending on the polymer; polyurethane elastomers may have slopes of the order of

or even 10 times

[ 31 ]. Mooney’s solution has been to incorporate such slope by adding a