Finite Element Analysis of Viscoelastic/Damage Behaviors of Composite Solid Propellant for Underwater Intelligent Equipment

This paper studies viscoelastic behaviors of composite solid propellant for multiple material layers of underwater intelligent equipment by theoretical modeling and finite element analysis (FEA). First, the viscoelasticity/damage coupled model is developed for hydroxyl-butyrate composite propellant layer, based on the Schapery integral-type viscoelastic model. Second, FEA by using ABAQUS-UMAT subroutine is performed to implement the model based on the recursive algorithm, and the tensile load–displacement curve by FEA is compared with the experimental results of solid propellant. Finally, distributions of the stress, strain and damage variable with increasing displacement loads are obtained. It is shown that the viscoelastic damage feature of solid propellant can be represented by the developed model and numerical technique well.