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We present a modified model based on shear rate and aging time dependentstatic friction between a soft solid such as gelatin hydrogel and a hardsurface for instance glass surface. Earlier the model for static friction(Juvekar and Singh, 2016) considered only the bond rupture process as a result,the friction model over predicts the static friction in the experiment. Thefriction model now takes into account both formation and rupture of molecularchains at the sliding interface. It is also assumed that age of the newlyformed bonds during the rupture process is the same as the aging time. As aresult, the model predicts quite well the experimental data and thushighlighting the significance of bond formation in static friction. Moreover,it is also observed that residual stress has no effect on static strength.

A Modified Model for Static Friction of a Soft and Hard Solid Interface