SU1707399A1 - Shell fabricated from composite materials - Google Patents

Abstract

The invention relates to mechanics, in particular to pipes made of plastics. The purpose of the invention is to simplify manufacture and increase reliability, achieved by the fact that the shell casing obtained by winding threads through intersecting spirals, contains a rigid fixing element that creates a local zone of variation of the curvature of the shell, is made of transverse threads, placed on the outer surface of the spiral intersecting threads. and attached to them along the contour of the local zone. The winding angle of the spiral intersecting threads is in the range of 4-54 to the longitudinal axis of the sheath, 5 or 3

Description

The invention relates to mechanical engineering and may be used in pipes and pipelines for public utility purposes.

A rubber-cord shell is known, the skeleton of which is formed by threads wound in intersecting spirals.

However, the manufacture of shells with a modified local curvature in local areas when using this design solution is difficult. Mechanical cutting and reinforcement do not give them shells of increased reliability.

The purpose of the invention is to simplify manufacture and increase reliability.

The sheath made of composite materials holds the skeleton of filaments wound under intersecting at an angle of 4-54 ° to the longitudinal axis of the shell of spirals provided with a rigid fixing element in the form of a local zone of variation of the curvature of the shell made of transverse m longitudinal axis of the shell of the filaments superimposed on the frame and fixed ends on the spirals winding around the perimeter of the local zone.

The peculiarity of this shell construction is the presence of a shell skeleton of filaments wound in intersecting spirals at an angle of 4-54 ° to the axis of symmetry of the shell, as well as a rigid fixing element made of a low-deforming material whose shape corresponds to the shape of the local zone an element of filaments superimposed on the framework, transverse to the longitudinal axis of the shell, the presence of bonding of the ends

J

with so with so

transverse, not gay with intersecting shells of the sheath.

FIG. 1 shows the shell, a general view; FIG. 2 is a section A-L np fGGCH; on fig.Z - view B in figure 1; in fig. - view In figure 1; FIG. 3 shows settlement schemes.

The shell of composite materials contains a frame 1 of threads, wound on intersecting spirals m 2, laid under the k- $ k angle to the shell axis, connecting elements 3 rigid fixing elements k from spiral layers m 2 5 attached to them with their ends 6 .

The material for the yarns are yarns, tows or tapes based on, for example, glass, organic, carbon or boron fibers impregnated with a binder. Epoxy, polyester, phenolic or silicone resins are used as binders.

The rigid locking element k is made of a low-deforming material, such as glass, organic, carbon filaments, having a low deformation in the axial direction, impregnated with binder to hold the framework threads.

The casing of composite materials is made by winding onto a rotating inflatable mandrel under the overpressure of threads impregnated with a binder, stacked along intersecting spirals.

followed by UK2 at an angle y-51

By the hand and by fixing to the spirals 2 threads of the fixing element k, impregnated with the binder. By supplying additional pressure to the mandrel, the preform of the shell is deformed at which its length decreases and the radius increases, except for the location of the fixing element, where a local zone is formed with a modified curvature along the contour and forming the shell. Fastening

five

0

5 Q

five

0

five

the modified shape results from the curing of the binder during the heat treatment of the shell.

The manufacture of shells with a local zone of variation of their curvature is possible only if the intersecting spirals are laid at an angle k- to the shell axis.

At angle 5, the shell has a stable equilibrium system (Fig. 56). FIG. Zero, 5c shows how the shell is deformable when the angle deviates from 5

At angles greater than b, the formation of a local zone with a modified curvature is impossible.

At angles less than b ° helix 2 have insufficient crossover, the material mainly works on axial stretching.

Claims (1)

The positive effect of using the invention is to simplify the manufacture of a shell with a local area of modified curvature and increase its reliability by using a rigid locking element of intersecting threads in the area of curvature change, fixed ends of the main spiral of the shell. Invention Formula A sheath made of composite materials, containing a skeleton of filaments wound on intersecting spirals, is distinguished by the fact that, in order to simplify manufacture and increase reliability, the skeleton is equipped with a rigid fixing element in the form of a local zone of variation of the curvature of the sheath, made transverse to the longitudinal axis the shells of the threads laid on the frame and fixed with the ends on the winding spirals along the perimeter of the local zone, and the threads of the spiral winding are laid at an angle ... 5 to the longitudinal axis of the shell. og he Vid f a . 4,5tf ° W figure 5 2. 4 -Y fi u7 p M ° 4 #