A predictive model for impact response of viscoelastic polymers in drop tests

摘要: We show for the first time that a classical Hookean viscoelastic constitutive law rubbery materials can predict impact forces and deflections measured with commercial drop tester when mass, or “tup” flat impacting surface is dropped onto pad of impact-absorbing rubber. The properties rubber, namely relaxation times strengths, are obtained by standard rheological linear-oscillatory test, equation momentum transfer then solved, using these parameters, assuming uniaxial deflection during impact. Good agreement between predicted series various heights, tup masses, areas, thicknesses, as long relative to its thickness small modest (<50% so), area less than equal tup. When greater tup, higher predicted, unless an empirical factor introduced account nonuniaxial stretching ring material extends outside area. These results imply polymeric be assessed simply examining material's linear spectrum.