Method for determining residual stress of sealing ring of solid rocket engine under high pressure

Abstract

The invention relates to a method for determining residual stress of a sealing ring of a solid rocket engine under high pressure, and belongs to the field of solid rocket engine sealing technology. The method includes the steps of determining related parameters of the solid rocket engine, determining the preload compression deflection of the sealing ring, determining the air pressure difference of the solid rocket engine working under high pressure, determining the deformation rate of the sealing ring under the preload state, solving the residual deformation rate of the sealing ring, and solving the residual stress of the sealing ring. Based on a Mooney-Rivlin model, a threaded connection simplified model and air pressure difference effect model established for a rubber sealing ring, the residual stress of the sealing ring under high pressure effect is determined according to known preload compression of the sealing ring and internal and external air pressure difference of the solid rocket engine, and leakage rate of the sealing ring when the solid rocket engine is under high pressure effect is determined. Theoretical support for improving the assembly process of a solid rocket engine is provided.

Description

technical field [0001] The invention belongs to the technical field of solid rocket motor sealing, and relates to a method for determining the residual stress of a solid rocket motor sealing ring under high pressure, in particular to a method for indirectly determining the residual stress of a solid rocket motor sealing ring under high pressure conditions through pre-tightening stress and air pressure difference Methods. Background technique [0002] Solid rocket motor (SRM) is an important component of missiles and space rockets, and its research work is closely related to space safety. During the assembly process of solid rockets, there are sealing performance requirements. Its sealing performance is of great significance to whether the solid rocket can work safely. When the solid rocket is working, if the sealing ring leaks, the pressure distribution of the ejected gas will be uneven, and the force on the solid rocket will be unbalanced; at the same time, high-temperatu...

AI Technical Summary

Problems solved by technology

The determination of the residual stress of the sealing ring is a necessary condition for studying the sealing performance of solid rocket motors, but it is difficult to directly detect the residual stress of the sealing ring, which is a difficult point in the research of the sealing performance of solid rocket motors

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