Abstract
In this article, we present a mathematical model that answers a classical question concerning how much force, which is generally called static friction force, will it require to initiate the motion of a soft solid block such as gel, rubber or elastomer on a hard surface for instance glass surface. The model uses population balance of the bonds between the polymer chains of the soft solid and the hard surface to estimate rate and aging time dependent static friction. The model predicts that under certain range of the pulling velocity, the friction stress at the onset of sliding (static friction stress) varies as the logarithm of the pulling velocity, as well as the logarithm of the aging time. These predictions are consistent with the experimental observations.
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