Nonlinear elastoviscousity of rubbers by cycling loading
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2013-12-17
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Abstract
In this work in analytical form are used instantaneous stress-strain relations incorporated in the hereditary integral equations of Volterra to predict the creep and relaxation of rubbers and rubberlike materials at large deformations. One takes into account the non-linearity of the viscous behavior in the presence of similarity in the isochronal stress-strain curves. These integral equations well describe the stress response by cycling in the case of imposed strains and vice-versa. Using this approach we have obtain the hysteresis loop for different imposed strains and the frequency and amplitude dependence of the loss factor by damping. Our theoretical results are compared with experimental data for polyisoprene rubber. The theoretical curves agree very god with the test ones.