Micromechanical Behavior of HTPB Propellant Bonding Interface under Uniaxial Tensile Loading

Abstract

AbstractIn order to study the mechanical behavior of solid rocket motor charge bonding interface under uniaxial tensile loading, the bonding interface of HTPB propellant/liner/insulator during uniaxial tensile process was scanned and reconstructed based on micro‐CT in‐situ loading, and the variation of porosity and interface debonding rate with strain was analyzed. A damage‐containing constitutive model based on the evolution of meso‐characteristic parameters was established for bonded interfacial components. The experimental analysis shows that the initial defects have a great influence on the location and evolution direction of the interface damage, and the interface damage can be quantitatively characterized by the interface debonding rate and porosity, and the interface debonding rate can better reflect the damage evolution process of micro‐pores and cracks near the propellant/liner interface. The damage‐containing constitutive model based on the evolution of mesoscopic characteristic parameters can effectively establish the structure‐activity relationship between mesoscopic parameters and macroscopic mechanical properties, and can predict the mechanical behavior of charge interface.