DE3243026A1 - Measuring arrangement for detecting cracks - Google Patents

Measuring arrangement for detecting cracks

Info

Publication number
DE3243026A1
DE3243026A1 DE19823243026 DE3243026A DE3243026A1 DE 3243026 A1 DE3243026 A1 DE 3243026A1 DE 19823243026 DE19823243026 DE 19823243026 DE 3243026 A DE3243026 A DE 3243026A DE 3243026 A1 DE3243026 A1 DE 3243026A1
Authority
DE
Germany
Prior art keywords
light
measuring arrangement
fibers
plastic
crack
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
DE19823243026
Other languages
German (de)
Inventor
Bernd 2874 Lemwerder Hofer
Samir 2822 Schwanewede-Leuchtenburg 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
Messerschmitt Bolkow Blohm AG
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 claimed from DE19823218430 external-priority patent/DE3218430A1/en
Application filed by Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Priority to DE19823243026 priority Critical patent/DE3243026A1/en
Priority to EP83109651A priority patent/EP0116685A1/en
Priority to US06/549,393 priority patent/US4603252A/en
Priority to JP21108783A priority patent/JPS606853A/en
Publication of DE3243026A1 publication Critical patent/DE3243026A1/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

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 detecting cracks in test specimens. Laid in plastic test specimens in addition to fibres for increasing strength are optical fibres which serve to trigger a crack display and enable the laying of the fibres to be monitored in the case of transilluminating the plastic by means of intense light.

Description

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

Die Erfindung bezieht sich auf eine Meßanordnung zum Feststellen von Rissen in Prüflingen, mit einem zur Auslösung einer Rißanzeige dienenden und am Prüfling angebrachten Rißdetektor, der nach Patent ( Patentanmeldung P 32 18 430.1 ) aus mit Licht versorgbaren Lichtleitfasern besteht, die in einem aus Kunststoff bestehenden Prüfling eingelegt sind.The invention relates to a measuring arrangement for determining Cracks in test objects, with one serving to trigger a crack indicator and on Test piece attached crack detector, which according to patent (patent application P 32 18 430.1 ) consists of optical fibers that can be supplied with light, which in a plastic existing test specimen are inserted.

Bei der Meßanordnung der zuvor angegebenen Hauptpatentanmeldung werden die Lichtleitfasern z. B. Kunststoffasern, Glasfasern oder Quarzfasern in einen aus Kunststoff bestehenden Prüfling integriert.In the measuring arrangement of the main patent application specified above the optical fibers z. B. plastic fibers, glass fibers or quartz fibers in one integrated test object made of plastic.

Die vorliegende Erfindung geht von der zuvor angegebenen Hauptpatentanmeldung aus und zeigt eine Weiterentwicklung. Diese Weiterentwicklung ist gekennzeichnet durch lichtleitende Glasfasern, die bei der Herstellung glasfaserverstärkter Kunststoffe zwischen den einzelnen Laminatschichten verlegt sind und nach Aushärten des Kunststoffes eine sichtbare Anzeige des Fasergefüges beim Durchleuchten der Fasern mit intemsivem Licht darstellen.The present invention is based on the parent patent application identified above and shows a further development. This further development is marked through light-conducting glass fibers, which are used in the manufacture of glass fiber reinforced plastics are laid between the individual laminate layers and after the plastic has hardened a visible indication of the fiber structure when x-raying the fibers with intemsivem Represent light.

Die erfindungsgemäße Maßnahme hat den Vorteil, die zur Rißerfassung eingesetzten Glasfasern gleichzeitig für eine Verlegungskontrolle der hergestellten faserverstärkten Kunststoffe zu benutzen. Bei der Her- stellung der Kunststoffteile lassen sich die lichtleitenden Glasfasern z. B. in Gitterform zwischen die Laminatschichten verlegen, so daß sich beim Durch leuchten eine sichtbare Anzeige von außen über den Verlauf der Fasern ergibt. Eventuell beim Pressen entstandene Verschiebungen oder Deformationen des Fasergefüges können auf diese Weise zusätzlich mit den zur Auslösung einer Rißanzeige eingelegten lichtleitenden Fasern sichtbar gemacht werden. Bei der Herstellung faserverstärkter Kunststoffe ist es zweckmäßig, vorgefertigtes zur Steigerung der Festigkeit vorgesehenes Fasermateria ( Glasfaser, Kahlenstoffaser) und zwar sog. "Prepreg-Material" mit lichtleitenden Fasern zu durchsetzen. Das Durch leuchten der verlegten Lichtleitfasern wird mit intensivem Licht, vorzugsweise mit Laserlicht vorgenommen, so daß die verlegten Lichtleitfasern durch das Kunststoffteil sichtbar werden und eine Kontrolle für derartig hergestellte Bauteile ermöglichen.The measure according to the invention has the advantage that for crack detection used glass fibers at the same time for a laying control of the manufactured to use fiber-reinforced plastics. At the her- position the plastic parts can be the light-conducting glass fibers z. B. in grid form Lay between the laminate layers so that a visible light is visible when shining through External display of the course of the fibers shows. Possibly created during pressing Displacements or deformations of the fiber structure can also be avoided in this way visible with the light-conducting fibers inserted to trigger a crack indicator be made. When manufacturing fiber-reinforced plastics, it is useful to prefabricated fiber material intended to increase strength (glass fiber, Kahlenstoffaser), namely so-called "prepreg material" to be enforced with light-conducting fibers. The shining through of the laid optical fibers is done with intense light, preferably made with laser light so that the laid optical fibers through the plastic part become visible and enable a control for such manufactured components.

Claims (4)

Meßanordnung zum Feststellen von Rissen Patentansprüche 1> Meßanordnung zum-Feststellen von Rissen in Prüflingen, mit einem zur Auslösung einer Rißanzeige dienenden und am Prüfling angebrachten Rißdetektor, der nach Patent, ..... ( Patentanmeldung P 32 18 430.1 ) aus mit Licht versorgbaren Lichtleitfasern besteht, die in einem aus Kunststoff bestehenden Prüfling eingelegt sind, dadurch g e k e n n z e i c h n e t, daß lichtleitende Glasfasern bei der Herstellung faserverstärkter Kunststoffe zwischen den einzelnen Laminatschichten verlegt sind und nach Aushärten des Kunststoffes eine sichtbare Anzeige des Fasergefüges beim Durchleuchten der Fasern mit intensivem Licht darstellen. Measuring arrangement for the detection of cracks Patent claims 1> Measuring arrangement for the detection of cracks in test objects, with one for triggering a crack indicator serving and attached to the test object, the crack detector according to patent, ..... (patent application P 32 18 430.1) consists of optical fibers that can be supplied with light, which in one plastic test specimen are inserted, thereby g e k e n n z e i c hn e t that light-conducting glass fibers are used in the manufacture of fiber-reinforced plastics are laid between the individual laminate layers and after the plastic has hardened a visible indication of the fiber structure when shining through the fibers with intense Represent light. 2) Meßanordnung nach Anspruch 1, dadurch g e k e n n -z e i c h n e t, daß die lichtleitenden Glasfasern in gitterförmiger Anordnung verlegt sind.2) measuring arrangement according to claim 1, characterized g e k e n n -z e i c h n e t that the light-conducting glass fibers are laid in a grid-like arrangement. 3) Meßanordnung nach Anspruch 1, dadurch g e k e n n -z e i c h n e t, daß für das intensive Licht Laserlicht benutzt wird.3) measuring arrangement according to claim 1, characterized g e k e n n -z e i c h n e t that laser light is used for the intense light. 4) Meßanordnung nach einem der Ansprüche 1 bis 3, dadurch g e k e n n z e i c h n e t, daß vorgefertigtes zur Steigerung der Festigkeit vorgesehenes Fasermeterial, Glas, Kohle usw. mit lichtleitenden Fasern zur Verlegungskontrolle und / oder zur Rißerfassung durchsetzt ist.4) measuring arrangement according to one of claims 1 to 3, characterized g e k e n n z e i h n e t that prefabricated intended to increase the strength Fiber material, glass, carbon, etc. with light-conducting fibers for laying control and / or is penetrated for crack detection.
DE19823243026 1982-05-15 1982-11-20 Measuring arrangement for detecting cracks Ceased DE3243026A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19823243026 DE3243026A1 (en) 1982-05-15 1982-11-20 Measuring arrangement for detecting cracks
EP83109651A EP0116685A1 (en) 1982-11-20 1983-09-28 Optical measuring arrangement for detecting flaws
US06/549,393 US4603252A (en) 1982-11-20 1983-11-07 Determination of the integrity of part of structural materials
JP21108783A JPS606853A (en) 1982-11-20 1983-11-11 Measuring device detecting crack

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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

Publications (1)

Publication Number Publication Date
DE3243026A1 true DE3243026A1 (en) 1984-05-24

Family

ID=25801852

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823243026 Ceased DE3243026A1 (en) 1982-05-15 1982-11-20 Measuring arrangement for detecting cracks

Country Status (1)

Country Link
DE (1) DE3243026A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384649A2 (en) * 1989-02-21 1990-08-29 Simmonds Precision Products Inc. Optical fibre mounting arrangements and methods
US5142141A (en) * 1990-09-19 1992-08-25 The Boeing Company Crack growth measurement network with primary and shunt optical fibers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2036336A (en) * 1978-09-29 1980-06-25 British Petroleum Co Measuring stress and strain using optical fibres
US4221962A (en) * 1978-04-24 1980-09-09 Northrop Corporation Fiber-optic moisture sensor for composite structures
EP0038401A1 (en) * 1980-04-22 1981-10-28 Philips Kommunikations Industrie AG Method of controlling the physical parameters of structural members
DE3111858A1 (en) * 1981-03-26 1982-10-14 Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen Measuring arrangement for detecting cracks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221962A (en) * 1978-04-24 1980-09-09 Northrop Corporation Fiber-optic moisture sensor for composite structures
GB2036336A (en) * 1978-09-29 1980-06-25 British Petroleum Co Measuring stress and strain using optical fibres
EP0038401A1 (en) * 1980-04-22 1981-10-28 Philips Kommunikations Industrie AG Method of controlling the physical parameters of structural members
DE3111858A1 (en) * 1981-03-26 1982-10-14 Vereinigte Flugtechnische Werke Gmbh, 2800 Bremen Measuring arrangement for detecting cracks

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0384649A2 (en) * 1989-02-21 1990-08-29 Simmonds Precision Products Inc. Optical fibre mounting arrangements and methods
EP0384649A3 (en) * 1989-02-21 1991-05-15 Simmonds Precision Products Inc. Optical fibre mounting arrangements and methods
US5142141A (en) * 1990-09-19 1992-08-25 The Boeing Company Crack growth measurement network with primary and shunt optical fibers

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