Solid rocket engine shell seal head stress calculation method

Abstract

The invention discloses a solid rocket engine shell seal head stress calculation method which mainly comprises the following steps: S1, intercepting a unit body from a shell, and establishing an equilibrium equation according to a symmetry condition and assuming that a film force is not close to a critical value; s2, introducing two new variables, and converting the balance equation into two second-order differential equations; s3, converting the two second-order differential equations into a fourth-order homogeneous linear differential equation; and S4, solving the differential equation by utilizing the connection condition of two adjacent shell elements, and further calculating the stress distribution of each part of the seal head. The method is used for calculating an orthotropic rotating surface shell bearing axisymmetric loads under small internal pressure, on a complex surface with variable angles, variable thicknesses and variable stiffness, the size and distribution of the linear stress of the seal head are solved through an accurate control equation of the seal head and a fragmentation analysis method, the result is matched with a finite element result, and a theoretical basis can be provided for the strength analysis of the seal head of the solid rocket engine shell.

Description

technical field [0001] The invention relates to the calculation of the complex shape surface stress of a composite material head, in particular to a method for calculating the stress of the head part of a solid rocket motor casing. Background technique [0002] Fiber-reinforced composites have a series of advantages such as high specific strength, specific stiffness and designable properties, which make them widely used in aviation, aerospace, medical treatment and automobiles. At present, solid rocket motor casing composite materials have entered the research stage of carbon fiber / epoxy resin composite materials on the basis of early glass fiber / epoxy resin composite materials. High-performance composite materials make solid rocket motor casings better. Meet its "light" and "reliable" requirements. Carbon fiber has high stiffness, but at the same time it is also a typical brittle material. Therefore, the carbon fiber composite shell is more sensitive to the stress concentr...

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Problems solved by technology

[0005] In order to check the strength of the solid rocket motor shell and overcome the defects of complex modeling process and lengthy calculation time of the existing finite element software, the present invention utilizes the basic knowledge of elastoplastic mechanics, combined with the relevant knowledge of composite material mechanics, from the essence of mechanics Carry out mechanical analysis on the complex shape of the head of the rocket motor shell, so as to provide reference for the rationality of the layup design and structural optimization of the solid rocket motor shell

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