Method for calculating thickness of end socket of fiber wound composite shell

Abstract

The invention relates to a method for calculating the thickness of a shell cover of a fiber wound composite material, which comprises the following steps of: obtaining a fiber track corresponding to an actual winding line type by solving differential equations of a winding angle and a core model corner; and calculating the fiber bundle side line of the end socket section by adopting a geodesic line offset method. In consideration of the continuous change of the curvature radius of the end socket section, the fiber bundle is divided into a plurality of small sections, and then each small section approximately considers that the offset angle of the geodesic line is not changed, so that an offset point can be easily calculated on each small section until the boundary is calculated. In order to facilitate numerical calculation of the intersection point of the reference line and the fiber bundle sideline, a rectangular coordinate of the fiber bundle sideline is converted into a polar coordinate, so that the intersection point of the reference line and the fiber bundle sideline can be easily calculated by adopting a linear difference method. By adopting the method, the seal head thickness curve of the seal head in any shape under any winding linearity can be calculated, so that the influence rule of the winding linearity on the seal head thickness can be researched.

Description

technical field [0001] The invention relates to the field of shell design of fiber-wound composite materials, in particular to a method for calculating the thickness of the head of a wound shell. Background technique [0002] In the field of analysis and design of filament wound composite shells, the head part is generally the weak link. Accurate head thickness is very critical in the analysis. If the head thickness parameters are not known, it is impossible to model and analyze the head section of the shell, and it is impossible to calculate the accurate head stress and displacement parameters, which will lead to many problems. It is difficult to optimize the design of the winding shell and obtain the optimized parameters with the best performance. [0003] The existing head thickness calculation methods mainly include general single formula method, Gramoll and Namiki method and cubic spline fitting method. [0004] The general single formula method is based on the two as...

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Problems solved by technology

[0009] In order to overcome the deficiency that the existing head thickness prediction method cannot consider the actual winding line type, the present invention proposes a head thickness calculat

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