WO2014064207A1 - Système permettant de contrôler le contact électrique dans une pièce en fibre de carbone - Google Patents

Système permettant de contrôler le contact électrique dans une pièce en fibre de carbone Download PDF

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Publication number
WO2014064207A1
WO2014064207A1 PCT/EP2013/072301 EP2013072301W WO2014064207A1 WO 2014064207 A1 WO2014064207 A1 WO 2014064207A1 EP 2013072301 W EP2013072301 W EP 2013072301W WO 2014064207 A1 WO2014064207 A1 WO 2014064207A1
Authority
WO
WIPO (PCT)
Prior art keywords
carbon fiber
fiber component
contact element
electrical contact
electrical
Prior art date
Application number
PCT/EP2013/072301
Other languages
German (de)
English (en)
Inventor
Walter Kiersch
Original Assignee
Walter Kiersch
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 Walter Kiersch filed Critical Walter Kiersch
Publication of WO2014064207A1 publication Critical patent/WO2014064207A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/44—Resins; rubber; leather
    • G01N33/442—Resins, plastics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • G01R31/68—Testing of releasable connections, e.g. of terminals mounted on a printed circuit board

Definitions

  • the invention relates to an arrangement for testing the electrical contact in a carbon fiber component.
  • Carbon fiber components combine good mechanical properties ⁇ properties with a low weight, which is why they are used in the production of manufactured articles, such as vehicles and aircraft, increasingly. In a number of applications, it is desirable to introduce an electrical current into the carbon fiber component. However, it is not easy to determine whether a contact element that is mechanically in contact with the carbon fiber component also produces the desired electrical contact.
  • the invention is based on the object to present an arrangement with which an electrical contact in a carbon fiber component can be reliably checked.
  • ge ⁇ dissolves with the features of claim 1.
  • Advantageous from ⁇ EMBODIMENTS can be found in the subclaims.
  • An electrical ⁇ ULTRASONIC contact element according to the invention is connected to the carbon fiber component.
  • a power source is incorporated in an electrical circuit extending across the electrical contact element and a line region in extends the carbon fiber component.
  • the arrangement comprises a thermal sensor for the transition region between the electrical contact element and the carbon fiber component and / or for the line region in the carbon fiber component.
  • Carbon fibers are contained at least in part.
  • the carbon fibers may be embedded in the so-called CRP components in a carrier material, such as a Epo ⁇ xidharz.
  • the term also includes, for example, glass fiber reinforced components that are supplemented with carbon fibers.
  • the substrate is usually an electrical insulator.
  • the carrier material can be mediated by the addition of electrically conductive particles ⁇ such as nanotubes, an electrical conductivity.
  • the Lei ⁇ tion area refers to the area of the carbon fiber component through which the electrical current flows. Normally, the electrical current moves substantially ge ⁇ rectilinear between two contact points.
  • the invention has recognized that a classic cons ⁇ level measurement often provides misleading statements about the elec- innovative contact between the contact element and the carbon fiber component. This is because the electrical ⁇ specific current is passed for resistance measurement by the carbon fiber component, successively passes through a plurality of preparation ⁇ che, in which an increased resistance may occur. These areas include the transition regions Zvi ⁇ 's contact elements and the carbon fiber component, as well as the lead portion inside the carbon fiber component itself.
  • a classic resistance measurement determined QUIRES ONLY lent the total resistance, but does not show where the Incr ⁇ te resistance exactly occurs.
  • the invention therefore proposes to transfer an electric current between the contact element and the carbon fiber component, which is sufficiently strong to cause heating in the regions of increased resistance.
  • the thermal sensor With the thermal sensor, the heating is detected, which can occur both in the transition region from the contact element to the carbon fiber component and within the line region of the carbon fiber component.
  • the quality of the contact point can be determined in the same way as the quality of the carbon fiber component or the carbon fibers themselves and their condition under load, after repair or during normal monitoring.
  • the current source can be designed to deliver a current pulse of limited duration. With a short current surge, with increased resistance, a warming of the transition region or of the conduction region occurs, but this is not so strong that the carrier material is damaged. A faulty contact element can be exchanged from ⁇ without repairs to the carbon fiber component are required. If errors occur in the conduction region, the carbon fiber component can be in the error range repa ⁇ riert targeted. The validity of the check can be increased if the power source is designed to deliver a series of multiple power surges.
  • the surges can for example, have a duration between 0.1 s and 3 s.
  • the current that is passed through the carbon fiber component in the test according to the invention depends strongly on con ⁇ creten application. For small carbon fiber components, which are hardly burdened with electrical currents in normal operation, are sufficient for the review of small currents. With carbon fiber components that are loaded during normal operation with high currents, higher currents for verification are Wesent ⁇ Lich required. In determining the correct amperage for the review is expediently as before so that you can set an electrical resistance to ⁇ next, which may not be exceeded internal ⁇ half of the carbon fiber component. The electric current should be calculated so that the temperature increase falls below a given threshold when this resistance falls below this value.
  • the threshold value can be, for example, 0.5 ° C. Tempe ⁇ ratur section section can be reliably determined with standard thermal sensors.
  • the power source may also be adapted to produce a constant in the We ⁇ sentlichen electrical current flowing during normal operation by the carbon fiber component, and to superimpose this with one or more electric pulses. This allows conclusions to be drawn as to whether the car ⁇ bonfaser component still has sufficient reserves of withstanding the normal operating loads in.
  • the current during the current surge should be at least 20% higher than the substantially constant electric current.
  • the thermal sensor may comprise a sensor connected to the transition region between the electrical contact element and the carbon fiber component and / or the line region is brought into contact. But preferred is a contactless ⁇ -contact measurement, in which the heat sensor reacts to the radiation emitted by the transition area / line area of heat radiation.
  • the thermal sensor a thermal imaging camera ⁇ in particular be a thermal camera.
  • the carbon fibers are aligned in the carbon fiber component in a plane. Consequently, a contact element which is brought in from a direction perpendicular to this plane would only touch the peripheral surface in the carbon fibers.
  • the contact resistance in such contact is significantly higher than the contact resistance in contact with an end face of the carbon fiber.
  • the end face of a carbon fiber is formed by separating it into two parts. In the context of the invention is therefore preferably provided that the electrical Victorele ⁇ ment is in contact with the end faces of the carbon fibers. If the carbon fiber cut perpendicular to its longitudinal direction, the end face of Quer4.000sflä ⁇ che carbon fiber equivalent. In a section of the oblique to
  • the end surface has an area greater than the cross-sectional area of the carbon fiber.
  • the over ⁇ transition region is designed to be the carbon fiber component so that the contact element lies against an end face which is larger than the cross-sectional area of the carbon fiber. Is This can be achieved by the cut surface, via which the contactless obliquely out ⁇ directed to the plane of the carbon fibers.
  • the electrical contact ⁇ element in a bore of the carbon fiber component angeord ⁇ net, the bore intersects the plane in which the Carbon fibers are aligned.
  • the bore is a conical bore.
  • the outer shape of the contact element is adapted to the holes, so that a full-surface contact is formed.
  • two surfaces of the carbon fiber component face each other in a wedge shape and the contact element has a wedge shape adapted to the surfaces.
  • An increased resistance within the carbon fiber component may result from fiber breakage, cracking or delamination.
  • the electrical circuit extending from the power ⁇ source via the contact element by the lead portion of the carbon fiber assembly back to the power source.
  • the carbon fiber component may be provided with two contact elements, so that the electrical circuit of the first contact element via extends the conduction region of the carbon fiber component to the second contact element and back to the power source.
  • the one pole of the power source is connected in a different way to the carbon fiber component.
  • the circuit is then closed by the contact element via the line region of the carbon fiber component back to the power source.
  • a plurality of contact elements can be tested parallel to each other.
  • the circuit is then in parallel through the plurality of through Kon ⁇ clock elements and the lead portion of the Carbonfa ⁇ ser-component closed.
  • an evaluation unit in which the electrical states of the carbon fiber component are combined with the thermal states of the carbon fiber component.
  • the associated stands to ⁇ a time scale by which the zuein ⁇ other associated thermal and electrical states ER can be averaged.
  • the arrangement according to the invention can serve in particular to check a plurality of similar carbon fiber components. For this purpose, a desired distribution of the thermal states within the carbon fiber component, which belongs to a specific sequence of electrical states, may be stored in a memory. If a carbon fiber component is tested with the corresponding sequence of electrical states, a comparison can be made with the desired distribution and it can be determined whether there is a deviation. If so, this indicates an error in the checked carbon fiber component.
  • the invention also relates to a method for testing the electrical contact in a carbon fiber component.
  • an electrical current is introduced via a contact element in the carbon fiber component.
  • the heat developing in the transition area between the contact element and the carbon fiber component and / or in the conduction area of the carbon fiber component is ermit ⁇ telt.
  • the method can be developed with further features which are described with reference to the arrangement according to the invention.
  • a carbon fiber component 14 in Fig. 1 some carbon fibers 15 are schematically indicated, which extend in the plane of the component 14.
  • the carbon fibers 15 are all shown in the schematic representation of FIG. 1 with the same orientation, in fact the carbon fibers extend. 15 in the plane in different directions.
  • the carbon fibers 15 are embedded in a carrier material such as epoxy resin.
  • a conical bore 16 is formed from ⁇ , in which a cone-shaped contact element 17 is inserted from an electrically conductive material.
  • the contact element 17 is preferably made of a material such as nickel 36, which has a similar low thermal expansion coefficient as the carbon fiber component 14. With its conical surface, the contact element 17 abuts against the end surfaces of the carbon fibers 15, wherein the end faces due to the oblique cut larger are as the cross- sectional area of the carbon fibers.
  • the contact element 17 comprises an electrical connection 18 which is connected via a cable 19 to a power source 20 verbun ⁇ .
  • the other pole of the current source 20 is conductively connected to the carbon fiber component 14 via an electrical connection 21.
  • the current therefore flows from the electrical connection 21 through the carbon fibers 15 of the carbon fiber component 14 in the direction of the contact element 17.
  • the current flows from the end surfaces of the carbon fibers 15 into the contact element 17 over, so that the circuit is closed.
  • the current source 20 is designed to conduct a current surge of greater current through the circuit, so that in the case of a defective contact, although heating occurs in the transition region, it does not damage the carrier material.
  • the emitted heat radiation is absorbed.
  • an evaluation unit 24 the signals from the IR camera 23 is evaluated ⁇ and determines whether there is a heating of the transition region 22 and the conduction region 26 after the initiation of the current surge. If this is not the case, the relevant contact element 17 and the line region 26 are in order. If heating occurs, it is determined whether it originates from the transition region 22 or the line region 26. If, in the portion 26 no temperature rise, this is error-free and it is sufficient to replace the con ⁇ tact element 17th
  • the carbon fiber component has two contact elements 171, 172, the electrical terminals 18 are ver ⁇ connected to the two poles of the current source 20.
  • the circuit is therefore from the first contact member 171 CLOSED ⁇ sen through the lead portion 26 of the Carbonfa ⁇ ser-member 14 to the second contact element 172nd
  • the current source 20 is controlled by a control unit 25 ⁇ so that it emits a series of power surges.
  • An IR camera 23 is arranged such that it records heat radiation from the transition regions 22 of both contact elements 171, 172 and from the line region 26.
  • the image of the IR camera 23 With an evaluation unit 24 the image of the IR camera 23 easierwer ⁇ tet and an assignment of the respective picture elements is made at the transition regions 22nd
  • the graphical representation output by the evaluation unit 24 may be as shown in FIG. There, the top curve shows the Ver ⁇ run the current strength.
  • the heat development in the Tl ⁇ transition region 22 of the first contact member 171 is shown in the medium-sized curve, and the heat generation in the T2
  • Transition region 22 of the second contact element 172 in the lower curve It is seen that the first contact element 171 is associated with each surge a significant increase in Tempe ⁇ temperature Tl. The electrical contact between the first contact element 171 and the carbon fiber component 14 is therefore faulty. The second contact element 172 is only a very slight increase in the temperature T2, which is a normal consequence of the current surge. The second contact element 172 thus has good electrical contact with the carbon fiber component 14.
  • set values for the temperature ⁇ turzuplace of the carbon fiber element 14 can be stored.
  • the evaluation unit 24 can perform an automatic comparison with the setpoint values and thus determine whether the carbon fiber component 14 is faultless.
  • a third embodiment is shown in FIG. There again, a pole of the power source 20 is connected via an electrical connection 21 directly to the carbon fiber component 14. The other pole of the current source 20 is connected in parallel connection with three contact elements 17, which is in sets ⁇ three conical holes 16 of the carbon fiber element 14 are. For each of the contact elements 17 eige ⁇ ne IR camera 23 is provided so that no evaluation is required which pixels belong to which contact element 17.
  • FIG. 5 schematically shows a carbon fiber 15, which is integrated in an electrically insulating carrier material and which extends between two contact elements 171, 172.
  • three isotherms 27 are shown as dashed lines.
  • the temperature in the carbon fiber 15 is significantly increased, which results from the fact that the isotherms 27 have a greater distance from the carbon fiber 15 there. So it still flows through the carbon fiber 15.
  • the increased temperature indicates a beginning fiber breakage, which may be caused by material defects, processing errors or overload.
  • the error in the phase is so ge ⁇ ringhegig that he advertising not detected by optical means the can.
  • Fig. 6 shows a view from above of a carbon fiber component 14, which is damaged in the middle by a crack is.
  • the isotherms 27 extend around the crack, thereby giving a characteristic image that deviates from the desired state. By a comparison with the desired state of the isotherms 27, the error can be determined automatically.

Abstract

Système permettant de contrôler un contact électrique, qui comporte une pièce en fibre de carbone (14), un élément de contact électrique (17) fixé sur la pièce en fibre de carbone (14), une source de courant (20) intégrée dans un circuit de courant électrique qui s'étend au-dessus de l'élément de contact électrique (17) et de la pièce en fibre de carbone (14), et un capteur de chaleur (23) pour la zone de transition (22) entre l'élément de contact électrique (17) et la pièce en fibre de carbone (14) et/ou pour la zone conductrice (26) dans la pièce en fibre de carbone (14).
PCT/EP2013/072301 2012-10-24 2013-10-24 Système permettant de contrôler le contact électrique dans une pièce en fibre de carbone WO2014064207A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202012010194.3 2012-10-24
DE202012010194.3U DE202012010194U1 (de) 2012-10-24 2012-10-24 Anordnung zum Prüfen des elektrischen Kontakts in einem Carbonfaser-Bauteil

Publications (1)

Publication Number Publication Date
WO2014064207A1 true WO2014064207A1 (fr) 2014-05-01

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PCT/EP2013/072301 WO2014064207A1 (fr) 2012-10-24 2013-10-24 Système permettant de contrôler le contact électrique dans une pièce en fibre de carbone

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DE (1) DE202012010194U1 (fr)
WO (1) WO2014064207A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015209862B4 (de) * 2015-05-29 2022-03-03 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Analyse eines Funktionsbereichs eines Werkstücks und Verwendung von IR-Thermografie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089700A (en) * 1990-01-30 1992-02-18 Amdata, Inc. Apparatus for infrared imaging inspections
WO2006077157A1 (fr) * 2005-01-24 2006-07-27 Kiersch Composite Gmbh Dispositif pour produire un flux de courant electrique a travers des fibres de carbone
US20080304539A1 (en) * 2006-05-12 2008-12-11 The Boeing Company Electromagnetically heating a conductive medium in a composite aircraft component
WO2011050787A2 (fr) * 2009-10-26 2011-05-05 Fachhochschule Dortmund Dispositif pour la mise en contact électrique de stratifiés électroconducteurs en plastiques renforcés de fibres de carbone (stratifiés en prfc)
US20110142091A1 (en) * 2008-05-20 2011-06-16 Massachusetts Institute of Techonology Systems and methods for structural sensing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089700A (en) * 1990-01-30 1992-02-18 Amdata, Inc. Apparatus for infrared imaging inspections
WO2006077157A1 (fr) * 2005-01-24 2006-07-27 Kiersch Composite Gmbh Dispositif pour produire un flux de courant electrique a travers des fibres de carbone
US20080304539A1 (en) * 2006-05-12 2008-12-11 The Boeing Company Electromagnetically heating a conductive medium in a composite aircraft component
US20110142091A1 (en) * 2008-05-20 2011-06-16 Massachusetts Institute of Techonology Systems and methods for structural sensing
WO2011050787A2 (fr) * 2009-10-26 2011-05-05 Fachhochschule Dortmund Dispositif pour la mise en contact électrique de stratifiés électroconducteurs en plastiques renforcés de fibres de carbone (stratifiés en prfc)

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