Static structures (e.g. – buildings) – With synthetic resinous component – With nonresinous component
Patent
1987-03-13
1988-09-06
Murtagh, John E.
Static structures (e.g., buildings)
With synthetic resinous component
With nonresinous component
52731, 156218, E04C 328
Patent
active
047683236
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a composite tubular element, i.e. made of resistant fibers (glass, carbon, boron, etc . . . ) coated with hardenable resin, intended to form a light and resistant structural part. It is particularly, although not exclusively, adapted to produce structural parts for airplanes, helicopters, artificial satellites, etc . . . The present invention also relates to a process and to a device for manufacturing such a tubular element.
It has already been thought to make aeronautical or spatial structural parts, such as floor struts or chords of truss ribs for example, by means of composite tubular elements. Such elements work in traction, compression and bending and it is desirable that they present a good rigidity to buckling, as well as a good capacity to resist cutting efforts.
Furthermore, for their fixation to the other parts of a structure, the known tubular elements necessitate the arrangement of joining pieces at their ends.
These joining pieces are generally added and fixed by rivets and/or glued, with the result that the efforts are transferred by very localized zones, this leading to the necessity of considerable local reinforcements. Moreover, the joining pieces are most often made of metal, and this may result in problems of differential expansion and/or of galvanic corrosion.
For these additional reasons, the known composite tubular elements are not adapted to support efforts other than those of compression and of traction.
It is an object of the present invention to overcome these drawbacks and to produce composite structural tubular elements which are particularly resistant even to bending stresses and to cutting efforts, which may be connected to other parts of a structure without the arrangement of special added joining pieces.
To this end, according to the invention, a structural tubular element made of resistant fibers coated with hardenable resin and intended to form a part of a structure, is noteworthy in that it comprises an inner axial wall, also made of resistant fibers coated with hardenable resin, forming integral part with said element and extending over the whole length thereof and in that, at the ends of said element, portions of said axial wall are accessible to form zones of fixation of said element to other parts of said structure.
It is seen that said axial wall thus communicates to the tubular element excellent properties of resistance both in traction and in compression and in bending or to the cutting efforts, whilst allowing the connection to other structural parts (also constituted by identical tubular elements or totally different elements, such as for example metal sections), without arrangement of added joining pieces.
In fact, the accessible parts of said axial wall are preferably pierced with holes for the passage of fixation means, such as for example rivets, screws, bolts, etc . . . The accessible parts of said axial wall may be cleared on their two opposite faces. However, for purposes of mechanical strength, it is preferable if these parts are cleared only on one side, their other side being covered by the outer contour of said element.
The section of the current part (i.e. not including the ends) of said element therefore presents the at least approximate form of the Greek letter theta. This section may have a circular contour and the axial wall then becomes diametral. On the other hand, the section of the ends of said element is in the form of a likewise circular half-moon, possibly. The part of the outer curvilinear contour of the ends may be recessed opposite the holes for passage of the fixation means provided in the accessible parts of the axial wall, in order to facilitate the positioning of said fixation means. According to the arrangements of the structure to which said element belongs, the accessible end faces of said axial part may be directed in the same direction or in opposite directions.
Reinforcements of resistant fibers are preferably provided in the ends of said tubular element.
According to a preferred process of prod
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Coutant Herve
Jumel Jean-Pierre
Aerospatiale - Societe Nationale Industrielle
Murtagh John E.
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