DE102016010671A1 - A connector for connecting tubular fiber-plastic composites to at least one component and a tubular fiber-plastic composite in conjunction with a connector - Google Patents

Abstract

The invention relates to connectors for connecting tubular fiber-plastic composites with at least one component and tubular fiber-plastic composites in conjunction with a connector. The connectors and the tubular fiber-plastic composites are characterized in particular by the fact that a positive connection with a connector as a fitting in a mixed construction in the form of fiber-plastic composites with components is also realized for high pressures. For this purpose, a first end region of a tubular main body has an element for connecting the main body to the component as a connecting element. For connecting the base body to the tubular fiber-plastic composite, the second end region has a thickening with groove-shaped depressions introduced at least in certain regions in such a way that polygonal shapes or shapes of a conic section are delimited by the depressions. Furthermore, located between the connecting element and the thickening at least one undercut in the body.

Description

The invention relates to connectors for connecting tubular fiber-plastic composites with at least one component and tubular fiber-plastic composites in conjunction with a connector.

A connector for connecting tubular fiber-plastic composites to metal components and tubular fiber-plastic composite in conjunction with a connector is also known as a fitting. The fitting is a generic term for connection parts in the assembly technology and is used to adapt pipelines, for example in the installation technology, aerospace and automotive industry, to the external conditions. Fittings are available in a variety of materials and in many forms, such as angles, bends, T-pieces, reducers. The classic joining techniques between fitting and pipe include welding (steel), bolting, soldering, mating and pressing. Although the screwed, plugged and pressed connections can be made with different pipe and fitting materials, they can only be used in low pressure ranges.

Through the publication EP 0 056 930 B1 is a core tube element for a double-tube core drilling known. This consists of a pipe section with a substantially constant cross section of a synthetic resin, the ends of which are provided with connecting pieces, by means of which the portion is connectable to other core tube elements. The pipe section consists entirely of a synthetic, fiber-reinforced resin. The connectors have a surface provided with a series of grooves in which twisted fibers hook.

The publication EP 2 998 591 A1 discloses a connecting element for introducing transverse forces, in particular in truss structures in the form of a cuff which can be applied around an elongated element, with at least one preferably metallic force introduction component arranged on the circumference of the cuff. This has a raised portion with at least one connection point for connection to further elements and a flat portion which adjoins the raised portion in the longitudinal direction of the sleeve and / or circumferential direction of the sleeve on. The cuff consists essentially of a first layer of fiber composite material and a second layer of fiber composite material, which at least a part of the force introduction component and the first layer of fiber composite material coated together and thus connects the force introduction component with the first layer. The raised portion may also be configured substantially trapezoidal.

Through the publication EP 2 162 634 B1 For example, an arrangement for connecting an elongate element to another component is known. The assembly has for connecting a used in particular for receiving and / or transmission of tensile and / or torsional elongated member having a further component at least on a portion projections, which penetrate a sheath element at least partially. The sheath element consists essentially of a fiber composite material whose fiber structure is produced by braiding and / or winding process. The projections are present in a tight array at least in a region of the force introduction element. Furthermore, the projections are pin-shaped, wherein the ratio between the height of the projections and the diameter of the projections is three and more.

The invention specified in the claims 1 and 9 the object of the invention is to realize a connection with a connector as a fitting in mixed construction in the form of fiber plastic composites with components even for high pressures.

This object is achieved with the features listed in the claims 1 and 9.

The connectors for connecting tubular fiber-plastic composites with at least one component and the tubular fiber-plastic composites in conjunction with a connector are characterized in particular by the fact that a positive connection with a connector is realized as a fitting in a mixed construction in the form of fiber plastic composites with components even for high pressures ,

For this purpose, a first end region of a tubular main body has an element for connecting the main body to the component as a connecting element. For connecting the base body to the tubular fiber-plastic composite, the second end region has a thickening with groove-shaped depressions introduced at least in certain regions in such a way that polygonal shapes or shapes of a conic section are delimited by the depressions. Furthermore, located between the connecting element and the thickening at least one undercut in the body.

Continuous fiber reinforced pipe structures are used in various areas of mechanical engineering due to their good mechanical properties and the very high degree of lightweight construction. To connect to other components, a hybrid connectivity technology is required. The connector according to the invention is characterized by a connection technique through fittings for the use of mixed construction. In addition to the pressures, weight and volume also play a decisive role. For connection techniques with different connection materials, high pressure ranges from 350 bar are a big challenge. With the classical joining techniques between fiber plastic composites and metals high pressures due to leaks or material failure are not readily possible.

The connector advantageously leads to a new connection technology, whereby fittings can be used as connectors in mixed construction of fiber-plastic composites with components even at high pressures. The connection is a positive and non-positive connection between the tubular fiber-plastic composite and the connector as a fitting made of metal.

The use of the connector leads to a reliable, secure and easy-to-qualify connection to the interface of fiber-reinforced plastic composite to at least one component. By removing material on a fitting body a free form is created, which consists of different grooves. The example milled parabolic grooves are introduced in a polygonal shape or shape of a conic section. The polygonal shape can be for example a diamond shape, a rectangular shape, a triangular shape or another polygonal shape. The shape of a conic section may be, for example, a parabola or a circular section. Other than the polygonal shapes or conical sections shown here are not excluded. The hybrid connection takes place in the winding process, wherein the grooves can represent Rovingführungen. Depending on the fiber angle, the groove angle is determined and removed from the fitting. In this case, a groove angle of 0 to 90 ° can be realized.

In the case of pull-out tests, the ratio of length to diameter of the polygonal or conically shaped geometries with the web-like outlet does not lead to buckling and failure of the free-form. There are no notch effects and the free form is also not prone to train, shear and torsion. In the case of static and dynamic loads, the unchanged structure of the basic body provides sufficient strength and rigidity.

The material removed from the base leaves polygonal or conic geometries on the fitting. These can be varied by groove width and groove depth and thus allow a completely positive connection between the base body, for example, a metal and the fiber composite. The freeforms protrude into the composite material without the fibers having to be damaged or removed. About depth and width of the grooves different requirements for high tensile, compressive and torsional forces can be met. Thus, in addition to the wound rovings, fiber-reinforced plastic composites made of braided sleeving can also be applied.

By simultaneously removing the grooves during the manufacturing process of the body, the material and manufacturing costs are low. Depending on the tool, stainless steel, aluminum and titanium can serve as fittings.

• – keine Schweißanlage notwendig,
• – Freiform schnell über mehrachsige Fräsmaschine realisierbar,
• – Verbindungsfestigkeit liegt über dem Niveau einer strukturellen Klebung,
• – minimale Faserschädigung,
• – kein Wärmeeintrag,
• – keine zusätzlichen Aushärteschritte,
• – verschiedene Nutenbreiten und Nutentiefen möglich,
• – hohe Zug-, Druck- und Torsionsfestigkeit und
• – einfache und günstige Herstellung.

This results in the following advantages

• - no welding system necessary,
• - Free form can be realized quickly via multi-axis milling machine,
• Joint strength is above the level of a structural bond,
• - minimal fiber damage,
• - no heat input,
• - no additional curing steps,
• - different groove widths and groove depths possible,
• - high tensile, compressive and torsional strength and
• - easy and cheap production.

The tubular fiber-plastic composite is thus in connection with the connector advantageously a wound on the second end region and / or fiber composite fiber composite.

Advantageous embodiments of the invention are specified in the claims 2 to 8 and 10.

The thickening is according to the embodiment of claim 2 advantageously a bulged thickening of the body.

The region having the groove-shaped recesses is, according to the embodiment of claim 3, the region pointing in the direction of the connecting element or the entire region of the bulged thickening.

The groove-shaped recesses are according to the embodiment of claim 4 as radially encircling touching or overlapping triangles, waves or parabolas introduced recesses. The grooved recesses are intersecting recesses. In the surface, these grooves form polygonal shapes.

The groove-like recesses intersect according to the embodiment of claim 5. In addition, the depths of intersecting grooves are different from each other and / or The bottom of the grooves in the longitudinal direction has a waveform.

The radially encircling Mehrecke are according to the embodiment of claim 6, a series of polygons or conic sections of the same length, further wherein the length of the Mehrecke or conical sections in the direction of undercut from row to row radially circumferential Mehrecke or conical sections is smaller.

The second end region, according to the embodiment of claim 7 in the direction of the first end region ribs and / or waves and the thickening.

The connecting element is according to the embodiment of claim 8, a thread, a coupling element or an element for cohesive connection.

The turning point of the fiber-reinforced plastic composite is according to the embodiment of claim 10 when winding in the undercut of the body.

An embodiment of the invention is illustrated in principle in the drawings and will be described in more detail below.

Show it:

1 a connector for connecting tubular fiber-plastic composites to at least one component and

2 in diamonds introduced cavities in the connector in a detailed view.

A connector for connecting tubular fiber-plastic composites to at least one component consists essentially of a fitting consisting of a tubular base body 1 with an area 2 with a thread as a connecting element and a region with a thickening 3 and in polygonal shapes groove-shaped recesses. A polygonal shape is, for example, the shape of a rhombus 4 ,

The 1 shows a connector for connecting tubular fiber-plastic composites with at least one component in a schematic representation.

The first end area 2 of the tubular base body 1 has the thread to the connection of the body 2 with the component on. The thread can be known to be an external thread or an internal thread. The second end region for connecting the main body 1 with the tubular fiber plastic composite has the bulged thickening 3 with at least partially rhombuses 4 introduced groove-shaped depressions. The area having the groove-shaped recesses is the area of the bulged thickening in the direction of the thread 3 , Between the thread and the thickening 3 there is at least one undercut 5 in the main body 1 ,

The 2 shows in rhombuses 4 introduced recesses in the connector in a schematic detail view.

The recesses introduced into the groove-like recesses are depressions introduced as radially encircling touching or overlapping triangles, waves or parabolas, so that these are the diamonds 4 are. The depressions intersect. The depths of the intersecting grooves may be different from each other. The radial diamonds 4 are a series of rhombuses 4 same length. Furthermore, the length of the rhombuses 4 towards undercut from row to row of radial diamonds 4 smaller. By removal of material on the body 1 a free form is created, which consists of different grooves. The grooves represent the roving guides. Depending on the fiber angle, the groove angle is determined and removed from the fitting. In this case, a groove angle of 0 to 90 ° can be realized. In the example shown in the figures, the grooves start at a +/- 10 ° angle and end on the undercut in front of a hexagon. During the wrapping process, the roving follows the + 10 ° roving guide when wrapping the fitting. He drives at least half a turn in the undercut and then runs on the matching -10 ° Rovingführung again from the fitting.

The second end region may continue in the direction of the first end region 2 ribs 7 and / or waves and the thickening 3 exhibit.

The tubular fiber-plastic composite is, in conjunction with the connector, a fiber-plastic composite wound onto the second end region. The end of the coil of the fiber-reinforced plastic composite is located in the undercut of the body 1 ,

LIST OF REFERENCE NUMBERS

1

body

2

first end area

3

thickening

4

diamonds

5

undercut

6

hexagon

7

ribs

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0056930 B1 [0003]
• EP 2998591 A1 [0004]
• EP 2162634 B1 [0005]

Claims (10)

A connector for connecting tubular fiber-plastic composites to at least one component, characterized in that a first end region ( 2 ) of a tubular body ( 1 ) an element for connecting the main body ( 1 ) having the component as a connecting element, that the second end region for connecting the main body ( 1 ) with the tubular fiber-plastic composite thickening ( 3 ) with groove-shaped depressions introduced at least in certain regions such that polygonal shapes or shapes of a conic section are delimited by the depressions, and that between the connecting element and the thickening ( 3 ) at least one undercut ( 5 ) in the main body ( 1 ) is located. Connector according to claim 1, characterized in that the thickening ( 3 ) a bulbous thickening ( 3 ) of the basic body ( 1 ). A connector according to claim 2, characterized in that the groove-shaped recesses having region in the direction of connecting element facing region or the entire region of the bulbous thickening ( 3 ). Connector according to claim 1, characterized in that the groove-shaped recesses are introduced as radially encircling touching or overlapping triangles, waves or parabolas introduced recesses or that the groove-shaped recesses are intersecting depressions. A connector according to claim 1, characterized in that the groove-shaped recesses intersect and that the depths of intersecting grooves are different from each other and / or the bottom of the grooves in the longitudinal direction thereof has a wave shape. A connector according to claim 1, characterized in that the radially encircling polygonal or conical sectional shapes are a series of polygonal or conical sectional shapes of equal length and the length of the polygonal or conical sectional forms in the undercut direction becomes smaller from row to row of radially revolving polygonal or conical shapes. A connector according to claim 1, characterized in that the second end region ribs (15) towards the first end region. 7 ) and / or waves and the thickening ( 3 ) having. Connector according to claim 1, characterized in that the connecting element is a thread, a coupling element or an element for material connection. Tubular fiber-reinforced plastic composite in conjunction with a connector according to claim 1, characterized in that the tubular fiber-reinforced plastic composite is wound on the second end region and / or laid fiber-plastic composite. Fiber-plastic composite according to claim 9, characterized in that the turning point of the fiber-reinforced plastic composite during winding in the undercut ( 5 ) of the basic body ( 1 ) is located.

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