A nonlinear viscoelastic constitutive model of solid propellant

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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 modified 180 degrees peel test. The nonlinearities during cyclic loading are accounted for by the functions of the octahedral shear strain measure. The model is evaluated with different 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. (C) 1999 Elsevier Science Ltd. All rights reserved.
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ME-Journal Papers(저널논문)
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