DE3218430A1 - Measuring arrangement for determining cracks - Google Patents

Measuring arrangement for determining cracks

Info

Publication number
DE3218430A1
DE3218430A1 DE19823218430 DE3218430A DE3218430A1 DE 3218430 A1 DE3218430 A1 DE 3218430A1 DE 19823218430 DE19823218430 DE 19823218430 DE 3218430 A DE3218430 A DE 3218430A DE 3218430 A1 DE3218430 A1 DE 3218430A1
Authority
DE
Germany
Prior art keywords
measuring arrangement
optical fibers
crack
light
test
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.)
Ceased
Application number
DE19823218430
Other languages
German (de)
Inventor
Bernd 2874 Lemwerder Hofer
Samir 2822 Schwanewede Malek
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 Defence and Space GmbH
Original Assignee
Vereinigte Flugtechnische Werke 2800 Bremen GmbH
Vereinigte Flugtechnische Werke GmbH
Vereinigte Flugtechnische Werke Fokker 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
Priority to DE19813111858 priority Critical patent/DE3111858A1/en
Priority claimed from DE19813111858 external-priority patent/DE3111858A1/en
Application filed by Vereinigte Flugtechnische Werke 2800 Bremen GmbH, Vereinigte Flugtechnische Werke GmbH, Vereinigte Flugtechnische Werke Fokker GmbH filed Critical Vereinigte Flugtechnische Werke 2800 Bremen GmbH
Priority to DE19823218430 priority patent/DE3218430A1/en
Priority to DE19823243026 priority patent/DE3243026A1/en
Publication of DE3218430A1 publication Critical patent/DE3218430A1/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/08—Testing mechanical properties
    • G01M11/083—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0064—Initiation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0066—Propagation of crack

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

The invention relates to a measuring arrangement for determining cracks, in which the optical fibres, which are inserted in plastics parts, are tested for their passage of light.

Description

Meßanordnung zum Feststellen von Rissen Measuring arrangement for the detection of cracks

Meßanordnung zum Feststellen von Rissen in Prüflinge,l mit einem zur Auslösung einer Rißanzeige dienenden und am Prüfling angebrachten Rißdetektor, der nach Patent...(Patentanmeldung P 31 11 858.5) aus am Prüfling angebrachten und über einen Lichteinkoppler mit Licht versorgten Lichtleitfasern besteht.Measuring arrangement for the detection of cracks in test objects, l with a for Triggering of a crack indicator serving and attached to the test specimen, the crack detector according to patent ... (patent application P 31 11 858.5) from attached to the test item and over a light coupler with optical fibers supplied with light.

Bei der Meßanordnung des zuvor angegebenen Haupipatentes (Hauptpatentanmeldung) besteht der Rißdetektor aus Lichtleitfasern, welche auf den jeweils zu untersuchenden Prüfling aufgeklebt werden. Mittels eines Lichteinkopplers wird diesen Lichtleitfasern Licht zugeführt, deren Transmission an den anderen Enden mit einem Lichtdetektor überwacht wird. Ein in einer Lichtleitfaser aufgrund eines Risses entstandener Bruch reduziert die Lichttransemission in dieser Faser sehr stark und hat daher zur Folge, daß der Lichtdetektor hierauf anspricht und ein Signal zur Auslösung einer Rißanzeige erzeugt. Von besonderem Vorteil ist dabei die Tatsache, daß durch den unmittelbaren Kontakt der Lichtleitfasern mit der Bauteiloberfläche sich eine hohe Nachweisempfindlichkeit ergibt, und daß Korrosionsprobleme nicht auftreten können.With the measuring arrangement of the main patent specified above (main patent application) the crack detector consists of optical fibers, which point to the respective to be examined Test specimen are glued on. By means of a light coupler these optical fibers light fed, the transmission of which is monitored at the other ends with a light detector will. A break in an optical fiber due to a crack is reduced the light transmission in this fiber is very strong and therefore has the consequence that the Light detector responds to this and generates a signal to trigger a crack display. Of particular advantage is the fact that through direct contact the optical fibers with the component surface have a high detection sensitivity results, and that corrosion problems can not occur.

Rißdetektoren dieser Art haben den Vorteil, daß eine einmal ausgelöste Rißanzeige irreversibel ist, so daß ein entstandener Riß auch nach Entlastung des Prüflings angezeigt wird. Die vorliegende Erfindung geht von dem Hauptpatent aus und zeigt eine Weiterentwicklung. Diese Weiterentwicklung ist dadurch gekennzeichnet, daß in einen aus Kunststoff bestehenden Prüfling Lichtleitfasern eingelegt sind. Die Lichtleitfasern können dabei auch anstelle einzelner zur Verstärkung dienender Fasern in die Kunststoffteile eingesetzt sein.Crack detectors of this type have the advantage that once triggered Crack indication is irreversible, so that a crack that has occurred even after the load is removed Is displayed. The present invention is based on the main patent and shows a further development. This further development is characterized by that optical fibers are inserted into a test piece made of plastic. The optical fibers can also be used for reinforcement instead of individual ones Fibers used in the plastic parts.

Die erfindungsgemäße Weiterentwicklung zeigt eine vorteilhafte Anwendung für aus Kunststoffteilen bestehende und zu überwachende Prüflinge. Das in die Lichtleitfasern auf einer Seite eingekoppelte Licht wird dabei auf seinen Durchgang auf der anderen Seite überprüft. Fehlender Lichtdurchgang ist dabei das Kriterium für einen aufgetretenen Riß, welcher auf die im Hauptpatent beschriebene Weise ermittelt wird. Bei einem Prüfling kann es sich um eine Kunststoffschicht, und zwar ein sogenanntes Laminat oder ein beliebiges, aus Kunststoff bestehendes und zu überwachendes Teil handeln Der besondere Vorteil ergibt sich hier durch das bei der Herstellung vorzunehmende Einsetzen der Lichtleitfasern, so daß später keine derartigen Fasern auf die Prüflinge aufzubringen sind.The further development according to the invention shows an advantageous application for test objects consisting of plastic parts and to be monitored. That into the optical fibers Light coupled in on one side is thereby restricted to its passage on the other Page checked. A lack of light transmission is the criterion for one that has occurred Crack, which is determined in the manner described in the main patent. At a The test item can be a plastic layer, a so-called laminate or any part made of plastic that is to be monitored The particular advantage here results from what has to be done during manufacture Insertion of the optical fibers so that later no such fibers on the test specimens are to be raised.

Claims (2)

Patentansprüche Ci Meßanordnung zum Feststellen von Rissen in Prüflingen mit einem zur Auslösung einer Rißanzeige dienenden und am Prüfling angebrachten Rißdetektor, der nach Patent... (Patentanmeldung P 31 11 858.5) aus am Prüfling angebrachten und über einen Lichteinkoppler mit Licht versorgten Lichtleitfasern besteht, dadurch g e k e n n z e i c h n e t , daß in einen aus Kunststoff bestehenden Prüfling Lichtleitfasern eingelegt sind. Claims Ci measuring arrangement for detecting cracks in test objects with one that is used to trigger a crack indicator and is attached to the test specimen Crack detector, which according to patent ... (patent application P 31 11 858.5) from the test object attached and supplied with light via a light coupler consists, in that it is made of plastic Test object optical fibers are inserted. 2. Meßanordnung nach Anspruch 1, dadurch g e k e n n -z e i c h n e t , daß die Lichtleitfasern anstelle einzelner zur Versfärkung dienender Fasern in die Kunststoffteile eingesetzt sind. 2. Measuring arrangement according to claim 1, characterized in that g e k e n n -z e i c h n e t that the optical fibers instead of individual fibers used for reinforcement in which plastic parts are inserted.
DE19823218430 1981-03-26 1982-05-15 Measuring arrangement for determining cracks Ceased DE3218430A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19813111858 DE3111858A1 (en) 1981-03-26 1981-03-26 Measuring arrangement for detecting cracks
DE19823218430 DE3218430A1 (en) 1981-03-26 1982-05-15 Measuring arrangement for determining cracks
DE19823243026 DE3243026A1 (en) 1982-05-15 1982-11-20 Measuring arrangement for detecting cracks

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813111858 DE3111858A1 (en) 1981-03-26 1981-03-26 Measuring arrangement for detecting cracks
DE19823218430 DE3218430A1 (en) 1981-03-26 1982-05-15 Measuring arrangement for determining cracks

Publications (1)

Publication Number Publication Date
DE3218430A1 true DE3218430A1 (en) 1983-11-17

Family

ID=25792139

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823218430 Ceased DE3218430A1 (en) 1981-03-26 1982-05-15 Measuring arrangement for determining cracks

Country Status (1)

Country Link
DE (1) DE3218430A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3447122A1 (en) * 1984-12-22 1986-06-26 Messerschmitt-Bölkow-Blohm GmbH, 2800 Bremen MEASURING ARRANGEMENT FOR DETECTING CRACKS IN TEST UNITS

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2117299C3 (en) * 1971-04-08 1979-08-16 Continental Gummi-Werke Ag, 3000 Hannover Monitoring device for conveyor belts
EP0038401A1 (en) * 1980-04-22 1981-10-28 Philips Kommunikations Industrie AG Method of controlling the physical parameters of structural members

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2117299C3 (en) * 1971-04-08 1979-08-16 Continental Gummi-Werke Ag, 3000 Hannover Monitoring device for conveyor belts
EP0038401A1 (en) * 1980-04-22 1981-10-28 Philips Kommunikations Industrie AG Method of controlling the physical parameters of structural members

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3447122A1 (en) * 1984-12-22 1986-06-26 Messerschmitt-Bölkow-Blohm GmbH, 2800 Bremen MEASURING ARRANGEMENT FOR DETECTING CRACKS IN TEST UNITS

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