Fibre optic sensing based on the Rayleigh signal analysis support the investigation of the deformation behaviour of structures in a comprehensive manner. Glass fibre sensors applicated on the surface of any solid or soft material as well as embedded in composites, provide a high-resolution strain measuring. Compared with equidistant strain measurement such as Strain Gages, the fibre optic sensing enables a smooth progress of strain along the fibre axis with high local resolution. The study shows the applicability of fibre optic sensors on glass surfaces and the determination of the interlaminar behaviour of polymeric interlayer material under static and thermal load. The elastic parameters depending on time, strain and temperature are examined on large-scale specimen in bending tests and compared with standard tests on small scale specimen. The results show, that the standard tests give proper initial values of the pure interlayer material. However, the structure-related effects of composite panels like the locking effect or the restraint of lateral extension can be captured more detailed using different large-scale tests. In addition to the small-scale tests the large-scale tests show a decreasing statistical dispersion caused by large effective area of investigation. In conclusion fibre optic sensing provides a powerful method for the experimental investigations of the thermo-mechanical behaviour of polymeric interlayer materials in the laminated state. Both, the determination of the mechanical behaviour of polymeric interlayer materials in glass laminates and the evaluation of the numerical model can be used as a basis for computer-aided analysis of building structures.
Characterization of polymeric interlayer materials in the laminated state using fibre optic sensors
Company: Universität Siegen, Siegen, Germany
About the speaker:
Univ.-Prof. Dr.-Ing. Thorsten Weimar studied civil engineering at Rheinisch-Westfälischen Technischen Hochschule Aachen and received his diploma in 2001. Afterwards he was assistant professor at Institute of Structural Design of Rheinisch-Westfälischen Technischen Hochschule Aachen until 2005. From 2006 to 2011 he worked and received a doctor degree at Institute of Building Construction of Technische Universität Dresden. Since 2011 he directs the Chair of Building Structure at Universität Siegen as full professor with the main research in glass in buildings.