A nonlinear viscoelastic constitutive model of solidpropellant

A nonlinear viscoelastic constitutive model for solid propellant is proposed[ The viscoelastic dewetting criteria is developed and the softening of the solid propellant due to damage is treated by the modulus decrease[ In the calculation of the modulus decrease\ the modulus of void\ which is created by dewetting\ is modeled with non zero constant values[ The values of adhesion energy between the binder and AP particle are obtained by a modi_ed 079> peel test[ The nonlinearities during cyclic loading are accounted for by the functions of the octahedral shear strain measure[ The model is evaluated with di}erent loading conditions and the predicted values well matched the measured ones[ The model provides a simple and convenient means to predict solid propellant behavior without requiring a complex micromechanical description