A method for calculating the thickness of filament wound composite shell head

Abstract

The invention relates to a method for calculating the thickness of a shell head of a fiber-wound composite material. By solving the differential equations of the winding angle and the core mold rotation angle, the fiber trajectory corresponding to the actual winding line type is obtained. The geodesic offset method is used to calculate the fiber bundle edge of the head section. Considering that the radius of curvature of the head section is constantly changing, the fiber bundle is divided into multiple small segments, and then the geodesic offset angle is approximately considered to be unchanged on each small segment, so that the offset can be easily calculated on each tiny segment points until the calculation reaches the boundary. In order to facilitate the numerical calculation of the intersection point between the reference line and the fiber bundle sideline, the Cartesian coordinates of the fiber bundle sideline are transformed into polar coordinates, so that it is easy to calculate the intersection point between the reference line and the fiber bundle sideline by the method of linear difference. This method can be used to calculate the head thickness curve under the arbitrary winding linearity of the head of any shape, so that the influence of the winding linearity on the thickness of the head can be studied.

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...

AI Technical Summary

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 calculation method based on the fiber winding process, which provides a method based on the winding track of the actual fiber bundle A New Method for Predicting the Thickness of Filament Wound Shell Head

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