DE3317051A1 - Measuring arrangement for detecting cracks - Google Patents

Measuring arrangement for detecting cracks

Info

Publication number
DE3317051A1
DE3317051A1 DE19833317051 DE3317051A DE3317051A1 DE 3317051 A1 DE3317051 A1 DE 3317051A1 DE 19833317051 DE19833317051 DE 19833317051 DE 3317051 A DE3317051 A DE 3317051A DE 3317051 A1 DE3317051 A1 DE 3317051A1
Authority
DE
Germany
Prior art keywords
optical fibers
measuring arrangement
fibers
test
roughening
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
DE19833317051
Other languages
German (de)
Inventor
Bernd Dr. 2874 Lemwerder Hofer
Samir Dr. 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
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
Application filed by Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Priority to DE19833317051 priority Critical patent/DE3317051A1/en
Priority to EP83109651A priority patent/EP0116685A1/en
Priority to US06/549,393 priority patent/US4603252A/en
Publication of DE3317051A1 publication Critical patent/DE3317051A1/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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • 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 pieces, in which optical fibres which are laid in the test piece, consisting of plastic, are tested for their light transmission. To increase the adhesive effect and improve the detection sensitivity, the optical fibres were roughened beforehand with an etching liquid.

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 zum Auslösen einer Rißanzeige dienenden Rißdetektor, der nach Patent (Patentanmeldung P 32 18 430.S) 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 a crack detector serving to trigger a crack indicator, according to patent (patent application P 32 18 430.S) made of optical fibers that can be supplied with light consists, which are inserted into a test piece made of plastic.

Bei der Meßanordnung des zuvor angegebenen Hauptpatentes (Hauptpatentanmeldung) werden die Lichtleitfasern, zum Beispiel Kunststoffasern, Glasfasern oder Quarzfasern, in einen aus Kunststoff bestehenden Prüfling integriert. Diese Verfahrensweise nutzt den Herstellungsprozeß der zu untersuchenden Prüflinge gleichzeitig zum Anbringen der Lichtleitfasern aus. Die Lichtleitfasern können dabei auch anstelle einzelner sonst zur Yerstärkung dienender Fasern in die Kunststoffteile eingesetzt sein. Das in die Lichtleitfasern zum Beispiel auf einer Seite einkoppelbare Licht wird bei der Prüfung auf seinen Durchgang zur anderen Seite geprüft. Fehlender Lichtdurchgang ist dabei das Kriterium für einen aufgetretenen Riß.With the measuring arrangement of the main patent specified above (main patent application) the optical fibers, for example plastic fibers, glass fibers or quartz fibers, integrated into a test piece made of plastic. This procedure uses the manufacturing process of the test specimens to be examined at the same time as attaching of the optical fibers. The optical fibers can also be used instead of individual otherwise used to strengthen fibers used in the plastic parts. That light that can be coupled into the optical fibers on one side, for example, is at the exam is checked for its passage to the other side. Lack of light passage is the criterion for a crack that has occurred.

Die vorliegende Erfindung geht von der Lösung des Hauptpatentes (Hauptpatentanmeldung) aus mit der Aufgabe, die Nachweisempfindlichkeit und die Haftung eingelegter Lichtleitfasern zu erhöhen. Gemäß der Erfindung ist diese Aufgabe dadurch gelöst, daß die Lichtleitfasern vor dem Einlegen in den Prüfling mit einer Atzflüssigkeit zur Aufrauhung behandelt sind.The present invention is based on the solution of the main patent (main patent application) with the task of the detection sensitivity and the adhesion of inserted optical fibers to increase. According to the invention, this object is achieved in that the optical fibers treated with an etching liquid for roughening prior to being placed in the test specimen are.

Die erfindungsgemäße Maßnahme hat den Vorteil, daß die Oberfläche der Lichtleitfasern durch die Aufrauhung gegenüber ihrer Einbettung eine wesentlich bessere Haftwirkung erzielt..Außerdem werden durch die Aufrauhung der Lichtleitfasern mikroskopische Kerben in der Oberfläche der Lichtleitfasern erzeugt, welche die Bruchdehnung dieser Fasern herabsetzt und damit Nachweisempfindlichkeit des ensors für Risse steigert.The measure according to the invention has the advantage that the surface of the optical fibers due to the roughening compared to their embedding Better adhesion achieved. In addition, the roughening of the optical fibers microscopic notches are created in the surface of the optical fibers, which the Elongation at break of these fibers reduces and thus the sensor's sensitivity to detection for cracks.

Die Behandlung der Lichtleitfasern zur Oberflächenaufrauhung kann mit Glasätztinte oder anderen die Fasern angreifenden chemischen Atzflüssigkeiten erfolgen. Weiterhin ist es zweckmäßig, die Lichtleitfasern nach ihrer Aufrauhung an Teilstücken mit Kunstharz zu ummanteln. Hierdurch ergibt sicht für die Fasern eine Schutzhülle, welche eine Verlegung der Fasern um Kanten oder Ecken ermöglicht. Auf die als Rißsensor wirkenden Teile der Lichtleitfasern wird eine Ummantelung nicht aufgebracht. Die Aufrauhung der Lichtleitfasern zur Verbesserung der Haftwirkung und zur Erhöhung der Nachweisempfindlichkeit des Rißsensors kann auch abschnittsweise, und zwar nur auf den im Sensorgebiet zu verlegenden Lichtleitfasern erfolgen. Dies ist zum Beispiel durch Versehen der Lichtleitfasern mit gegen die htzflüssigkeit resistenten Schutzhüllen möglich, so daß lediglich die als Rißsensor wirkenden keine Schutzhülle aufweisenden Abschnitte aufgerauht werden. Die so aufbereiteten Lichtleitfasern lassen sich mit den gleichen Vorteilen auch als Rißsensoren auf Oberflächen von Prüflingen aus Kunststoff, Metall oder sonstigen Werkstoffen aufbringen.The treatment of the optical fibers for surface roughening can with glass etching ink or other chemical etching liquids that attack the fibers take place. Furthermore, it is expedient to roughen the optical fibers after they have been roughened to coat parts with synthetic resin. This gives visibility to the fibers a protective cover that allows the fibers to be laid around edges or corners. A sheathing is applied to the parts of the optical fibers that act as crack sensors not upset. The roughening of the optical fibers to improve the adhesive effect and to increase the detection sensitivity of the crack sensor, it can also be used in sections, and only take place on the optical fibers to be laid in the sensor area. this is for example by providing the optical fibers with against the heating liquid resistant protective covers possible, so that only those acting as crack sensors do not Protective cover having sections are roughened. The optical fibers prepared in this way can also be used as crack sensors on surfaces of Apply test objects made of plastic, metal or other materials.

Claims (3)

Patentansprüche a Meßanordnung zum Feststellen von Rissen in Prüflingen mit einem zum Auslösen 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 die Lichtleitfasern vor dem Einlegen in den Prüfling mit einer AtzflüssigkeSt zur Aufrauhung behandelt sind. Claims a measuring arrangement for the detection of cracks in test objects with a crack detector that is used to trigger a crack indicator and is attached to the test specimen, according to patent ... (patent application P 32 18 430.1) made of optical fibers that can be supplied with light consists, which are inserted into a test piece made of plastic, thereby It is noted that the optical fibers must be used before they are inserted into the test object are treated with an etching liquid for roughening. 2. Meßanordnung nach Anspruch 1, dadurch g e k e n n z e i c h n e t, daß die mit der Xtzflüssigkeit aufgerauhten Lichtleitfasern teilweise mit einer Kunstharzhülle ummantelt 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 light guide fibers roughened with the Xtziquid partially with a Are coated with synthetic resin. 3. Meßanordnung nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t, daß für die Atzflüssigkeit zum Aufrauhen der Lichtleitfasern Glasätztinte benutzt wird.3. Measuring arrangement according to claim 1 or 2, characterized in that g e k e n n z e i c h n e t that for the etching liquid for roughening the optical fibers, glass etching ink is used.
DE19833317051 1982-11-20 1983-05-10 Measuring arrangement for detecting cracks Ceased DE3317051A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19833317051 DE3317051A1 (en) 1983-05-10 1983-05-10 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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833317051 DE3317051A1 (en) 1983-05-10 1983-05-10 Measuring arrangement for detecting cracks

Publications (1)

Publication Number Publication Date
DE3317051A1 true DE3317051A1 (en) 1984-11-15

Family

ID=6198639

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19833317051 Ceased DE3317051A1 (en) 1982-11-20 1983-05-10 Measuring arrangement for detecting cracks

Country Status (1)

Country Link
DE (1) DE3317051A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142041A1 (en) * 1991-02-26 1992-09-03 Robert Riedlberger Ground cable laying plough blade inclination setting device - uses rotary fixings providing blade angle inclined to normal to ground surface

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038401A1 (en) * 1980-04-22 1981-10-28 Philips Kommunikations Industrie AG Method of controlling the physical parameters of structural members

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038401A1 (en) * 1980-04-22 1981-10-28 Philips Kommunikations Industrie AG Method of controlling the physical parameters of structural members

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DE-B.: O.-A. Neumüller, Römpps Chemie-Lexikon, 8. Aufl., Stuttgart 1981, S. 1495 *
DE-OS 31 43 824, Titelseite und S. 14,15,22, 28 und 59 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142041A1 (en) * 1991-02-26 1992-09-03 Robert Riedlberger Ground cable laying plough blade inclination setting device - uses rotary fixings providing blade angle inclined to normal to ground surface

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8110 Request for examination paragraph 44
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