DE10156875B4 - Three-dimensional reinforcement structure for fiber-plastic composite materials and method for their production from a planar structure - Google Patents

Three-dimensional reinforcement structure for fiber-plastic composite materials and method for their production from a planar structure

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Publication number
DE10156875B4
DE10156875B4 DE2001156875 DE10156875A DE10156875B4 DE 10156875 B4 DE10156875 B4 DE 10156875B4 DE 2001156875 DE2001156875 DE 2001156875 DE 10156875 A DE10156875 A DE 10156875A DE 10156875 B4 DE10156875 B4 DE 10156875B4
Authority
DE
Germany
Prior art keywords
fiber
draping
reinforcing structure
characterized
structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE2001156875
Other languages
German (de)
Other versions
DE10156875A1 (en
Inventor
Christian Dr.-Ing. Weimer
Andreas Dr.-Ing. Wöginger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Helicopters Deutschland GmbH
Original Assignee
Institut fuer Verbundwerkstoffe GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institut fuer Verbundwerkstoffe GmbH filed Critical Institut fuer Verbundwerkstoffe GmbH
Priority to DE2001156875 priority Critical patent/DE10156875B4/en
Publication of DE10156875A1 publication Critical patent/DE10156875A1/en
Application granted granted Critical
Publication of DE10156875B4 publication Critical patent/DE10156875B4/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06Fibrous reinforcements only
    • B29C70/10Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/22Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
    • B29C70/222Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure the structure being shaped to form a three dimensional configuration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/54Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/543Fixing the position or configuration of fibrous reinforcements before or during moulding
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H13/00Other non-woven fabrics

Abstract

Out deposited in at least one level in one or more layers Fibers or fiber bundles produced by draping three-dimensional reinforcing structure for fiber-plastic composites characterized by prior to draping the reinforcing structure in its development in the area of draping zones introduced punctual and / or linear Fixations for predetermining the relative position or size of Drapierfixpunkten and / or drapery surfaces, as well as boundary lines and / or edge lengths of the reinforcement structure.

Description

  • The The invention relates to a reinforcing structure for fiber-plastic composites according to the preamble of claim 1. The invention relates Further, a method for producing a reinforcing structure for fiber-plastic composite materials.
  • to Production of components from fiber-plastic composites (FKV) are usually flat or thick-dimensionally reinforced textile reinforcing structures (Tissue, scrim, etc.) used. The production of three-dimensional trained forms or geometries takes place through a with a Draping process associated reshaping. This is often the case to a stacked construction of several layers of individual textile Sheet. Both in dry textile structures as well as in preimpregnated Systems (e.g., semi-finished thermoplastic or prepregs) it comes to wrinkles of the semifinished product or the bearing structure and restrictions the deformable geometries (Breuer, UP. "contribution to Umformtechnik gewebever Reinforced Thermoplastics "VDI Progress Reports Series 2, No. 433, Dusseldorf VDI-Verlag 1997).
  • reason therefor is the textile architecture that determines the drapability.
  • For continuous fiber reinforced plastics become reinforcements various textile fabrics used. These are usually flat tissue halves and various clutches. The Drapierfähigkeit of such textiles is through various process parameters (tissue type, Type of binding of the fabric) of the textile process is affected and applies for the complete imaged area. In individual processes, such as the impact technique (production of multiaxial opportunities), it is only possible one-dimensionally, the the drapability influencing parameters (e.g., number and type the tie lines) while the surface production adjust and thus the area give locally different drapabilities. For tissues Drapability is dictated by the choice of fabric type.
  • By the characteristics and properties of the textile fabrics become the following processing processes and the mechanical Properties of the fiber-plastic composite determined. The setting of the reinforcing fibers can over the Cross points of the fabric or the mesh form done in Occlusion. Likewise, there are adhesive possibilities conceivable. In the stacked fibrous reinforcing structure sliding or Deformation requirements usually given over the entire textile surface, the further processing of the fiber-plastic composite material influence.
  • A net-shape production of 3-D-shaped components is thus possible only with consideration or knowledge of the exact draping properties of the semi-finished product. The waste-optimized production of 2-D parts for 3-D moldings is therefore only conditionally possible. Highly drapeable semifinished products such as, for example, knitted fabric knits achieve the drapability by means of the amount of thread or thread reserve used in the stitch structure which binds the reinforcing scrim. This stitch forming operation of knitting to produce multi-axial layers takes place only in the axis perpendicular to the active unit ( DE 196 24 912 A1 and DE 197 26 831 A1 and Hörsting K. + Huster M "Targetting cost reduction by FEA-designed reinforcement textiles"; Proceedings "ECCM-8", Naples / June 1998, pp. 635-643). The additionally introduced thread usually acts as a disturbing element in the fiber-plastic composite structure. This is reflected, for example, in the reduction of in-plane properties or in achievable surface qualities. For fabrics, the draping is done by shearing the yarn sheets at the crossing points.
  • In the process for producing reinforcing structure semi-finished products according to the DE 100 05 202 A1 fibers or fiber bundles are placed on a transport gate by means of a laying unit and transported to a first sewing station. The fibers or fiber bundles in this case have certain relative positions to each other, which are secured by introduced in the sewing station seams. In the further course of this method, local reinforcements (fasteners) with a predetermined contour are fastened in a predetermined position by means of seams on the scrim thus formed. Thus, the introduced seams solely and solely have the task to ensure a secure connection between the scrim and the respective fasteners.
  • The device according to DE 694 10 967 T2 is based essentially on the object to produce a network of parallel glass fibers in which threads can serve as reinforcement within a complex composite part, wherein the binding of the glass fibers should be designed so that the fatigue strength of a composite part produced using such a network not is impaired.
  • To achieve the desired effect, namely to maintain the flexibility of the network despite the introduced in this seams, the well-known property of a chain stitch is exploited insofar as here form the individual loops of the seam a kind of hinge, creating a Richtungsän tion of the fibers or fiber bundles is made possible, so that they can extend, for example, angled, as shown in the drawing of this document.
  • The EP 0 567 845 B1 discloses a deformable multiaxial reinforcing structure of at least one carrier layer and associated reinforcing filaments for reinforcing high performance composites for the production of geometrically complex shaped articles with force-oriented laying of the reinforcing filaments. The free selectability of the dimensioning and laying of the reinforcing threads, which are used at points of large force or great risk of wear for the molding extremely strong reinforcing threads and weaker points correspondingly weaker reinforcing threads are used, which are connected by embroidering with the carrier layer, ensures optimum design options reinforcing structure. The introduced seams also serve exclusively to increase the mechanical strength of the reinforcing structure.
  • The DE 197 16 666 A1 shows a stress-seeking reinforcing structure, which allows a dense arrangement of the reinforcing threads, wherein the core portion of the reinforcing structure consists of first and second regions. In each of the first areas, the reinforcing threads are firmly fixed on a base while these are slidably disposed in the respective second areas on the basis and loosely run within a tunnel whose length substantially corresponds to the additional thread requirement in the subsequent spatial deformation of the reinforcing structure ,
  • Thus, the goal of the in the DE 197 16 666 A1 disclosed in the planar reinforcing structure to store the formation of the spatial deformation of the reinforcing threads length thereof to move this stock length during the spatial deformation through the respective tunnel in the range of spatial deformation of the reinforcing threads and to ensure that the reinforcing threads are distorted neither in the fixed nor in the displaceable areas, so that the original longitudinal orientation of the reinforcing threads is retained even after the spatial deformation.
  • All relate to the above publications thus primarily the production of the actual reinforcing structures without detailing their transformation from the predominantly two-dimensional Form to enter into a three-dimensional shape.
  • Of the Invention is based on the overall task, both by a Drape fabricated three-dimensional reinforcement structure for fiber-plastic composites, as well as to provide a method for their production.
  • For this The invention is initially the task underlying a reinforcing structure for generic fiber-plastic composites create, on the one hand defines draping zones and on the other hand other regions of the fiber reinforcement structure adjacent the draping zones untouched by this to make optimal use of the specific properties of the fibers.
  • These Task is in a generic reinforcing structure for fiber-plastic composites solved by the characterizing features of claim 1, which in the area of draping zones, punctiform and / or linear stiffeners for the determination of drapery points and / or draping surfaces, as well arranged by boundary lines and / or edge lengths of the reinforcing structure are.
  • By the exact definition of draping zones, drapery surfaces or Drapier points, sliding or deformation zones on the still flat Blanks of the dry, package-like reinforcement structure are on the one hand dimensionally stable, i.e. 2-D semi-finished products for the final contour accurate production of 3-D freeform surfaces and on the other hand, a targeted reshaping of such a layer structure possible.
  • According to one further suggestion, the stiffeners are formed by seams, the as single stitches or linear or sheet-shaped could be (Claim 2).
  • By the freely programmable seams simultaneously become multiple Aspects of making fiber-plastic composite components optimized. The component geometry corresponding line or area-shaped contour seams allow a positionally accurate cutting of the reinforcing semi-finished products and a very simplified workpiece assembly. By adapted to the fiber orientations in the layer structure variation of both the number the seams, as well as the sewing direction can the in-plane fiber properties are used optimally. For reshaping operations is a reduction by the described generation of slip planes, etc. wrinkling possible, what about the quality and the properties of the component made of fiber-plastic composites (resin-rich zones, Faserondulationen, fiber shifts). Furthermore, can the for the impregnation crucial flow paths between individual fiber bundles be improved by adjusting the fiber packing density.
  • In allow the level freely programmable sewing heads the exact introduction of fixed points, fixed straight lines or fixed surfaces, the leave a portion of the reinforcement structure unaffected in a transformation and release others as drapery zones. Ideally, this will be the draping pattern directly into the discarded fiber flocks without further textile process step brought in. Due to the minimal interference of the planar fibers, i. they are not weave patterns or in addition introduced knitting threads If present, the utilization of the reinforcing fiber properties can be further increased. At unbonded zones of the fiber bundles is thus an ideal Fiber matrix combination possible. The fixation of the fibers during the impregnation can over a minimal number of introduced seams. By seams the entire reinforcing structure penetrate, a liner shift is avoided. Unwanted wrinkling occur by the characteristic of the areal one-dimensional semi-finished products, or can target specific Restricted areas become.
  • For certain use cases it is advantageous according to claim 3, when the stiffeners of single or multi-layered amplification fiber packets of woven, laid, knitted, knitted or other fabrics and / or prefabricated textile reinforcing structures, for example Preforms exist.
  • to solution the invention underlying further object, a method for producing a three-dimensional reinforcing structure according to Claim 1 are to be made according to the characterizing features of claim 4 before the draping of the reinforcing structure in its settlement in the area of draping zones, punctiform and / or linear stiffeners for the formation of drapery points and / or draping surfaces, as well of boundary lines and / or edge lengths of the reinforcement structure brought in.
  • there can according to claim 5, the stiffeners by freely programmable Seams formed be whose elasticity by varying the yarn material used for use and / or through change the sewing parameter such as stitch length, Thread tension changed can be.
  • Provided a multi-layered semi-finished package as part of a one-dimensional forming is to be deformed, it is appropriate according to claim 6, the sewing parameters a respective lower layer package with respect to the sewing parameters of a contrast upper Lagepaketes to make so different that the in the stronger too stretched layer package introduced thread length greater than that in the less to be stretched layer package introduced thread length.
  • Further Advantages of the invention will become apparent from the following description an embodiment shown in the drawings.
  • It demonstrate:
  • 1 A 3-D freeform surface for a trunk half shell with draping zones and drapery planes for the exact definition of edge lengths and unaffected fiber areas;
  • 2 A flat semifinished product with stiffeners formed by seams for the formation of draping zones and drapery planes for a plurality of components for case shells;
  • 3 a blank of a reinforcing fiber structure of a component for a case half shell;
  • 4 a stacking of semi-finished products with different draping properties achieved by varying the sewing parameters and different thread lengths;
  • In 1 a reinforcing structure for a trunk half shell is shown, the oriented deposited fiber bundles 1 or stacked tissue monolayers 1 is formed. The fiber bundles 1 can be arranged at any angle, for example at an angle of +/- 45 °. In the reinforcing structure are of stitching 2 formed stiffeners, which serve to fix the contour of the reinforcing structure of the case half shell. The shape of these seams 2 therefore corresponds exactly to the required contours of the case half-shell as well as the drapery conditions in the area of the draping zones. In the formed state of the reinforcing structure, the seams 2 boundary lines 3 or edge lengths 4 the 3-D freeform surface of the case half shell.
  • 2 shows a portion of a planar path of a reinforcing structure into which the stiffening seams 2 are introduced. In 2 are therefore the settlements 5 The 3-D free-form surfaces for a total of 6 case half-shells to recognize, in which the seams 2 in the area of the draping zones the boundary lines 3 as well as the edge lengths 4 form the 3-D freeform surfaces of the case half shells.
  • The insertion of the seams 2 in the settlements 5 the reinforcing structures in the flat state with the aid of programmable sewing heads, wherein the fiber bundles 1 are placed in a predetermined orientation by means of a laying unit and brought into the stitch forming area of moving in the X and Y direction sewing heads.
  • Subsequently, the individual blanks 6 separated from the reinforcing structure web and, for example, accordingly DE 100 05 202 A1 processed into fiber-plastic composites.
  • The elasticity the seams to be introduced can adjusted by different sewing parameters become. This happens over the adaptation of the thread material used and / or in the Semi-finished thread length.
  • In 4 is the situation of a one-dimensional forming process in one of two layer packages 7 respectively. 8th shown formed semis package. In the forming process, the upper layer package 7 more stretched than the lower layer package 8th , Consequently, when introducing a seam 9 in the upper layer package 7 the stitch length and also the length of the in the layer package 7 To be introduced larger thread to choose than that in the lower layer package 8th to be introduced seam 10 is required.

Claims (6)

  1. Off in at least one level one or more layers oriented deposited fibers or fiber bundles produced by draping three-dimensional reinforcement structure for fiber-plastic composites characterized by prior to draping the reinforcing structure in its settlement in the area of draping zones introduced punctual and / or linear fixations for predetermining the relative position or size of Drapierfixpunkten and / or Drapierflächen, as well as boundary lines and / or edge lengths of the reinforcement structure.
  2. reinforcing structure for fiber-plastic composites according to claim 1, characterized in that the fixations are formed by seams.
  3. reinforcing structure for fiber-plastic composites according to claim 1, characterized in that the fixings of a or multilayer gain fiber packets of woven, laid, knitted, crocheted or other fabrics and / or prefabricated textile reinforcing structures, for example Preforms exist.
  4. Process for making a three-dimensional reinforcing structure for fiber-plastic composites from in at least one level one-or multi-layered deposited Fibers or fiber bundles, characterized in that prior to draping the reinforcing structure in their handling in the area of draping zones punctual and / or linear Fixings for the predetermination of the relative position or size of the forming Drapierfixpunkte and / or Drapierflächen, as well as boundary lines and / or edge lengths the reinforcing structure be introduced.
  5. Method according to claim 4, characterized in that that the Fixations are formed by freely programmable seams.
  6. A method according to claim 5 for the preparation of at least two on top of each other arranged layer packages existing semi-finished packages, characterized that the sewing parameters a respective lower layer package with respect to the sewing parameters of a contrast upper Lagepaketes be set so different that in one-dimensional Forming the layer packages in the more stretched layer package introduced thread length greater than which is introduced into the less stretched layer package thread length.
DE2001156875 2001-11-14 2001-11-14 Three-dimensional reinforcement structure for fiber-plastic composite materials and method for their production from a planar structure Expired - Fee Related DE10156875B4 (en)

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Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001156875 DE10156875B4 (en) 2001-11-14 2001-11-14 Three-dimensional reinforcement structure for fiber-plastic composite materials and method for their production from a planar structure
PCT/EP2002/012311 WO2003041948A1 (en) 2001-11-14 2002-11-05 Three-dimensional reinforcing structure for fiber-plastic composite materials and method for the production thereof from a flat structure

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DE10156875B4 true DE10156875B4 (en) 2007-05-31

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WO (1) WO2003041948A1 (en)

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DE102011109231A1 (en) * 2011-08-03 2013-02-07 Rheinisch-Westfälische Technische Hochschule Aachen Reinforcing semi-finished product for organic sheets and process for its preparation

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DE102004060674B4 (en) * 2004-12-15 2010-02-11 Eurocopter Deutschland Gmbh Method and device for producing a flat fiber preform
US20100028644A1 (en) * 2008-07-31 2010-02-04 Ming Xie Self conforming non-crimp fabric and contoured composite components comprising the same
US8234990B2 (en) 2008-07-31 2012-08-07 General Electric Company Methods for improving conformability of non-crimp fabric and contoured composite components made using such methods
DE102010050079A1 (en) * 2010-10-29 2012-05-03 Premium Aerotec Gmbh Partially fixed semi-finished textile
FR2971194A1 (en) * 2011-02-04 2012-08-10 Latecoere Method of making an elementary preform formed of a stack of reinforcing layers with a fibrous structure
FR2971193B1 (en) * 2011-02-04 2013-04-26 Latecoere Method for producing a fibrous structured preform presenting the form of a profile comprising a soul, and preformed realization
DE102011121658A1 (en) * 2011-12-19 2013-06-20 C-Con Gmbh Producing a component made of a fiber composite material with edge reinforcements, comprises e.g. compressing an arrangement in a mold, obtained by impregnating a fiber laminate layer with a resin, and curing the obtained component
DE102014207017A1 (en) * 2014-04-11 2015-10-15 Bayerische Motoren Werke Aktiengesellschaft Method for producing a semi-finished vehicle and semi-finished fiber and component made of a fiber composite material
DE102014221898A1 (en) * 2014-10-28 2016-04-28 Bayerische Motoren Werke Aktiengesellschaft Fiber composite component with failure behavior of a ductile material
DE102015107338A1 (en) 2015-05-11 2016-11-17 International Automotive Components Group Gmbh Composite fiber mat for producing a carrier plate of a motor vehicle component and method for its production

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DE10156875A1 (en) 2003-05-22

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