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- Sicherheitstechnik (8)
- Explosionsschutz (6)
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- Aktive Thermografie (4)
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A unique testing facility (KALFOS) using ESPI (electronic speckle pattern interferometery) as a referencing method has been realized for the characterisation of the strain transfer process from a component under load into surface applied fibre Bragg grating based strain sensors. The strain transfer mechanism can be described experimentally, while matching specific measurement requirements and environmental conditions.
Reliable measurement results with fibre optic sensors require profound knowledge of physical mode of function, of materials used and appropriate application. There is often serious discrepancy between use in laboratory environment and on site. The paper identifies important aspects to be considered and shows ways to transfer innovations onto practical use.
Fire simulation is mostly understood as simulation of room fires, i.e. where the free volume is
large compared to the volume occupied by the combustible matter. In such a case, the fire
propagation is predominantly a fluid dynamics problem. Fire propagation through bulk
materials, insulation layers or wooden construction elements is, however, determined by
conduction and diffusion. For these cases modified modelling principles and different
software solutions have to be applied. Computational results are presented for temperature
evolution and charring progress in a timber beam exposed to ISO standard temperature curve,
for self-ignition and fire propagation in a waste deposit with consideration to
conduction/diffusion and convection inside the porous medium and for a fire in an
underground coal seam where conduction/diffusion is the prevailing mechanism.