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A combination of Maxwell and Voigt models, with stiffness and damping variable according to the stress and strain rate, to represent nonlinear material responses, is coupled to a relaxation model, in order to represent the Mullins effect (the rubber mechanical behavior also depends on load history).
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Calculations are carried out by the FEM with the use of the non-linear-plastic material model with stiffness degradation.
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Then two static displacement models with different stiffness definitions are established and mathematically proved to be equivalent, both of which may be versatile for practical applications.
On the other hand, the explicit schema might require much smaller time steps compared to implicit integration alternative especially for models with high stiffness and low mass density.
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