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Speckle interferometry for analysing anisotropic thermal expansions - application to specimens and components

Optische Meßverfahren zur Analyse anisotroper Wärmedehnung - Anwendung auf Proben und Bauteile
: Aswendt, P.; Höfling, R.

Schnabel, S. ; Demat Exposition Managing, Frankfurt/Main:
Verbundwerk '92. International Conference on Reinforced materials and composite technologies : 1-3 July 1992, Wiesbaden, Germany; Competitive composites by new manufacturing of composite components from low to hightech areas
Frankfurt/Main: Demat Exposition Managing, 1992
Verbundwerk <1992, Wiesbaden>
Fraunhofer IWU ()
anisotrope Wärmedehnung; anisotropic thermal expansion; composite material; Dehnungsanalyse; speckle pattern interferometry; Specklemusterinterferometrie; strain analysis; Verbundwerkstoff

The paper describes a non-destructive, optical technique, digital speckle pattern interferometry (DSPI), that has been especially advanced for strain analysis and has proved well-suited for thermal deformation measurement. A first part deals with the principle of operation and its implementation for materials testing. A variety of applications is demonstrated. Fibre-reinforced composites of metal matrix (MMC) as well as nonmetal matrix (NMMC) type could be characterized by DSPI with respect to their thermal expansion dependent upon direction and temperature. Complete series of measurements could be performed quickly and without any restriction to the specimen shape. Just as well, engineering components including composite structures have been subject of investigation. Beside quantitative results real-time observation provides basic information for materials understanding.