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Characterisation of Thermal Expansion Coefficient of Anisotropic Materials by Electronic Speckle Pattern Interferometry
Author(s) -
Dudescu C.,
Naumann J.,
Stockmann M.,
Nebel S.
Publication year - 2006
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2006.00271.x
Subject(s) - thermal expansion , anisotropy , materials science , interferometry , speckle pattern , electronic speckle pattern interferometry , rotation (mathematics) , speckle imaging , optics , thermal , tilt (camera) , tensor (intrinsic definition) , aerospace , composite material , mechanical engineering , physics , computer science , geometry , engineering , mathematics , artificial intelligence , aerospace engineering , meteorology
Carbon fibre composites find wide applications in aerospace, sporting goods industry and biomedicine. Mechanical and thermal properties of such materials are highly anisotropic; therefore, adequate experimental measuring methods are requested to determine them. This paper describes the application of electronic speckle pattern interferometry to full‐field, real‐time characterisation of the coefficient of thermal expansion (CTE) of anisotropic materials. The topics such as correlation fringes tilt and influence of small rigid body rotation were theoretically described and experimentally verified. A series of measurements was carried out to determine the CTE tensor for unidirectional and bi‐directional carbon fibre laminates and to prove the feasibility of the method. The measuring set‐up developed includes a temperature control unit for cooling and heating and a one‐dimensional in‐plane speckle interferometer.