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DE-102024132654-A1 - FIBER COMPOSITE MATERIAL

DE102024132654A1DE 102024132654 A1DE102024132654 A1DE 102024132654A1DE-102024132654-A1

Abstract

The invention relates to a fiber composite material and a method for its production.

Inventors

  • Christoph Loy
  • Jürgen Joos

Assignees

  • SGL CARBON SE

Dates

Publication Date
20260513
Application Date
20241108

Claims (15)

  1. Fiber composite material, in particular for use as an automotive component or as a component of an automotive component, comprising ▪ a fiber material and ▪ at least one force introduction element, characterized in that the fiber material is attached to the at least one force introduction element with a fixing means.
  2. Fiber composite material according to Claim 1 , wherein the fiber material is selected from the group consisting of glass fibers, carbon fibers, ceramic fibers, basalt fibers, boron fibers, steel fibers, polymer fibers, or natural fibers or mixtures thereof.
  3. Fiber composite material according to Claim 1 or 2 , wherein the fiber material is formed as fiber strands or fiber ribbons present in at least one layer.
  4. Fiber composite material according to Claim 3 , where the number of layers is at least one.
  5. Fiber composite material according to one of the preceding claims, wherein the fiber material is impregnated.
  6. Fiber composite material according to Claim 5 , wherein the impregnation is selected from the group of thermoplastics, elastomers or thermosets.
  7. Fiber composite material according to one of the preceding claims, wherein the at least one force introduction element is made of metal, plastic or fiber-reinforced plastic.
  8. Fiber composite material according to one of the preceding claims, wherein the fixing agent is a plastic.
  9. Fiber composite material according to Claim 8 , wherein the plastic is selected from the group of thermoplastics, elastomers or thermosets.
  10. Fiber composite material according to Claim 9 , wherein the plastic is from the group consisting of polyamides (PA), preferably PA6, PA 6,6, PA 4,6, polypropylene (PP), polyethylene (PE), polyesters such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyoxymethylene (POM), polycarbonate (PC), polyethersulfone, polyetherketones, polyphenyl ethers (PEI), copolymers and/or mixtures of the aforementioned polymers, polyurethanes, particularly preferably of polyamides, or epoxy resins or polyurethanes or phenolic resins.
  11. Fiber composite material according to one of the preceding claims, wherein the bending stress due to bending at at least one force application element is less than 50% of the maximum achievable tensile stress.
  12. Fiber composite material according to one of the preceding claims, wherein the at least one force introduction element is an eyelet or a thimble.
  13. Fiber composite material according to one of the preceding claims, wherein the fiber composite material is a pull cable for a front-end module of a passenger car.
  14. A method for producing a fiber composite material comprising the following steps: a) Providing a fiber material in the form of one or more fiber strands b) Providing at least one force application element c) Layering the one or more fiber strands, in particular by winding, onto or around the at least one force application element from step b) d) Providing a fixing agent e) Fixing the fiber strands by means of the fixing agent from step d).
  15. Procedure according to Claim 14 , wherein after step a) and before step b) or during step c) the following additional steps are carried out: f) providing an impregnating material, g) impregnating the fiber material, h) cooling the impregnated fiber material

Description

Subject matter of the invention The invention relates to a fiber composite material and a method for its production. Background of the invention The production of automotive components from fiber-reinforced composite materials is well-established. However, for such components to be suitable for mass production, cost-effective and scalable manufacturing processes are needed, which are currently lacking. From the GB-A 1485586 The production of a unidirectional tape by discontinuously pressing layers of thermoplastic films and layers of parallel fiber bundles is known. However, a problem with this method is the insufficient impregnation of the individual fibers when the impregnation time is too short. Extending the impregnation time, however, leads to reduced throughput and thus lower profitability of the process. Furthermore, tape lamination generally results in an uneven matrix-to-fiber material distribution within the fiber composite. The EP3053734 B1 A process is disclosed in which a strand of reinforcing fibers impregnated with thermoplastic resin is hot-wound around a structure formed on a preforming tool to obtain a preform of the part to be manufactured. This preform is then cooled and removed from the preforming tool. Since the thermoplastic matrix material must first be completely heated before processing, this process is also complex. Furthermore, the heating can cause the semi-finished product to swell, which further complicates the scaling of the process. The EP0383199A1 Disclosing a process for the production of fiber composite materials in which parallel fiber bundles and thermoplastic melt are continuously pressed together briefly in a double belt press at a pressure of at least 10 bar, and the fiber bundles are embedded in a matrix so that the individual filaments are completely wetted. Therefore, existing methods cannot produce fiber composite materials of sufficient quality, or can only produce them at an insufficiently low cost. TASK Against this background, the object of the present invention was therefore to provide a fiber composite material that can be produced in a cost-effective and scalable manner and that has comparable or even better mechanical properties than materials known from the prior art. Description of the invention This problem is solved according to the invention by a fiber composite material, preferably for use as an automotive component or as a component of an automotive component, comprising ▪ a fiber material and ▪ at least one force introduction element characterized by the fact that the fiber material to which at least one force introduction element is attached with a fixing agent. “Fiber materials” are materials that have or consist of linear, thread-like structures. In the fiber composite material according to the invention, the fiber material is present in the form of one or more layers, which partially, preferably completely, have or consist of long and/or continuous fibers aligned parallel along an axis of extension. Each fiber layer has its own axis of extension, whereby the axes of extension of the one or more layers can be identical, i.e., overlapping or parallel. The "axis of extension" defines the direction of the fiber lay along which the parallel long or continuous fibers, i.e., the linear structures made of fibrous material, extend lengthwise. This corresponds to the direction of the fibers' greatest extension, i.e., their longitudinal extent. Since the axis of extension serves only to define the direction and determine the length L <sub>F1</sub> , L<sub>F2</sub> , it represents the infinite number of parallel axes of extension that theoretically exist. Its longitudinal extent is at least long enough to allow all fiber extensions in this direction, i.e., the lengths L <sub>F1</sub> , L <sub>F2 </sub>, etc., to be determined. The length L <sub>F1</sub> , L <sub>F2 </sub>, etc., over which the individual fibers extend along the respective axis of extension E <sub>FL1</sub> , E <sub>FL2 </sub> of the respective layer, is, in the simplest case of an ideally linear arrangement of the fiber along or parallel to the axis of extension, the total fiber length itself. In the case of a non-linear arrangement of the fiber, for example in the presence of bends, The corresponding length can be determined by projecting it onto the axis of extension. The total fiber length, i.e., the length from the fiber start point to the fiber end point, is, for example, different from the length along the axis of extension in designs with angled or curved layers, which are obtained, for example, by winding around an angled or round forming body such as an eyelet. The fiber composite material according to the invention comprises a fiber material selected from the group consisting of glass fibers, carbon fibers, ceramic fibers, basalt fibers, boron fibers, steel fibers, polymer fibers, or natural fibers or mixtures thereof, preferably carbon fibers. Polymer fibers are understood to b