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  • 1
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Holographic Interferometry - a Nondestructive Inspection Technique for Early Detection of Construction Element DamagesAfter a short introduction into the fundamentals of holographic of holographic interferometry, the application of this process to non-destructive material testing is explained. Practical examples of qualitative and quantitative deformation measurements carried out on building elements of different materials as well as on metallic and nonmetallic combinations show the possibilities of early recognition of manufacturing flaws and weak points due to the construction and also the determination of construction material characteristic coefficients.
    Notes: Nach einer kurzen Einführung in die Grundlagen der holographischen Interferometrie wird die Anwendbarkeit des Verfahrens in der zerstörungsfreien Materialprüfung erlätert. Praktische Beispiele zu qualitativen und quantitativen Verformungsmessungen an Bauteilen unterschiedlichster Werkstoffe sowie metallischer und nichtmetallischer Fügungen zeigen die Möglichkeiten zur Früherkennung von Verarbeitungsfehlern und konstruktionsbedingten Schwachstellen sowie zur Bestimmung von Werkstoffkenngrößen.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Evaluation of Elastic Constants of Anisotropic Composite Materials by Means of Holographic Vibration Analysis. The wellknown „plate-equation“ describing vibrations of thin, homogeneous and isotropic plates is reformulated for nonisotropic composites, and equations are derived for to determine elastic constants. If type and frequency of the natural vibrations are known from holographic interferometry and one of the elastic constants  -  for instance Poisson's number  -  is given or determined somehow else all other constants can be calculated.
    Notes: Die Schwingungsgleichung für dünne, homogene und isotrope Platten wird auf anisotrope Verbundwerkstoffe erweitert. Aus ihr läßt sich ein Gleichungssystem zur Bestimmung der elastischen Konstanten ableiten. Es können alle Elastizitätskonstanten explizit berechnet werden, wenn Typ und Frequenz der Eigenschwingungen sowie die Poissonsche Zahl in einer Richtung bekannt sind.Diese Größen werden aus Hologrammen von Platten, die zu Eigenschwingungen angeregt worden sind, und aus holographischen Verformungsmessungen ermittelt. An anisotropen GFK-Platten wird diese Methode zur Bestimmung der elastischen Konstanten demonstriert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 153-156 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Quantitative holographic testing of fibre reinforced plastic components of spacecrafts.The quantitative evaluation of holographic interferograms lead to an exact determination of displacements and deformations of arbitrary shaped objects. The measurements can be carried out in the range of about 0 to 100 μm with an accuracy of ± 0,05 μm. The application of this method is reported for the case of spacecraft components under thermal and mechanical load.
    Notes: Die quantitative Auswertung holographischer Interferogramme erlaubt eine exakte Bestimmung von Verschiebungen und Verformungen an beliebig geformten Objekten. Die Messungen im Bereich von ca. 0 bis 100 μm können dabei mit einer Genauigkeit von ± 0,05 μm durchgeführt werden. Es wird über die Anwendung dieses Verfahrens auf einige Bauteile aus der Raumfahrttechnik berichtet, die einer thermischen bzw. mechanischen Last ausgesetzt wurden.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 15 (1975), S. 16-28 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Holographic interferometry was investigated as a method for nondestructive testing of flat sheets of glass-fiber reinforced plastics. Initially, the deformation behavior of faultless sheets was examined by means of holographic interferometry. The interferograms which resulted from various loading conditions (i.e., tensile load, bending) were compared to results obtained mathematically. The interferograms of faultless sheets were then compared to those of defective laminates. By suitable loading of the smaples a range of laminate faults could be readily and qualitatively detected. The influence of these faults on the tensile strength was examined. Not only the mechanical loading of the laminates, but also an acoustic stimulation of the sheets proved suitable for interferometric detection of laminate faults.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
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