Research on mechanical behavior of particle/matrix interface in composite solid propellant

In the mesostructure of composite solid propellant, the interface formed between solid particle and matrix is a region with very special physical and chemical properties, and the mechanical behavior of the interface will directly affect the mechanical properties of the propellant. This article derived a viscoelastic cohesive constitutive model to describe the mechanical behavior of the interface. subsequently a particle/matrix interface specimen was design to measure the interface mechanical properties under different conditions. To this end, the parameters of the constitutive model were solved through a combination of experimental data fitting and inversion. It was found that the interface behavior exhibits strong rate and temperature correlations, and the cohesive constitutive model can effectively describe this characteristic.