The Mechanical Response Of Studies Temperature Impact Load Remedy To The Case

As the most important natural factor, ambient temperature plays a significant role on the structure mechanical properties of solid rocket motors. In order to investigate the structure integrity of propellant grain under extreme temperature conditions and build the relations between mechanic response and temperature load, thermal impact tests and numerical simulation research specific to a certain300mm solid rocket motor were performed in this paper.To solve the large strain measurement problem for HTPB propellant encountered during experimental studies, a bow-shaped strain transducer was tried. By using the finite element method, the feasibility of bow-shaped strain transducer applied on large strain measurement of HTPB propellant was preliminarily verified. The effects of transducer sizes were analyzed, and structure optimization design was performed for the transducer.Based on the transient heat conduction and linear viscoelastic theory, ABAQUS was used to simulate the thermal response of propellant grain during thermal impact test. The temperature field and stress-strain distribution was given to find the maximum stress and strain. And how the maximum stress and strain change with the length-diameter ratio and boss ratio was summarized.Finally, aiming at the debonding problem appears in the grain head, the propellant grain with a stress reliever was studied. The stress distribution of grain head under low temperature impact was obtained by numerical simulations. The effect of different stress reliever sizes on maximum stress was summarized. It could provide a reference for optimization design of the stress reliever.