Constitutive modeling of solid propellants for three dimensional nonlinear finite element analysis

摘要

A three dimensional constitutive model for solid propellants is proposed and implemented in a finite element software. The effects of viscoelasticity, large deformation, temperature, pressure, softening in monotonic and cyclic loadings are represented. Damage is assumed to initiate by failure of the particle binder bond or failure in the binder itself. Opening of the micro-cracks resulting from either failure is associated with the evolution of damage. Stress softening during unloading and reloading is captured via a cyclic function modifying the viscoelastic stress. The implementation algorithm is stable and robust, therefore analysis of general geometries and loadings are possible. The model may be calibrated with a small number of test data, therefore is suitable for practical use in the industry. (C) 2017 Elsevier Masson SAS. All rights reserved.