Filtern
Dokumenttyp
- Zeitschriftenartikel (1)
- Buchkapitel (1)
- Beitrag zu einem Tagungsband (1)
- Vortrag (1)
Sprache
- Englisch (4) (entfernen)
Schlagworte
- Emissivity (4) (entfernen)
Eingeladener Vortrag
- nein (1)
Amongst various other NDT methods, within the EMRP-project ‘VITCEA’ active thermography is validated for testing of CFRP and GFRP structures constructed for energy application. In this contribution, the optical and thermal properties of CFRP and GFRP reference defect artefact (RDA) and natural defects artefact (NDA) test specimens are characterized. Different excitation techniques and techniques for data analysis are compared for optimizing the number of detected defects.
The increased use of fibre reinforced plastic (FRP) composites for improved efficiency and reliability in energy related applications, e.g. wind and marine turbine blades, nacelles, oil and gas flexible risers, also increases the demand for innovative non-destructive testing technologies. In this contribution, results concerning the characterisation of CFRP and GFRP during and after quasi-static tensile loading are presented. It includes the measurement of optical properties in the infrared spectral range, tensile loading tests with the observation of the temperature distribution at one or both sides of the specimens using an infrared camera for the preparation and monitoring of intended natural defects, and active thermography inspections after tensile loading. It is shown that the defect preparation was successful. Thermographic monitoring during and active thermography testing after tensile loading enable the detection of the lateral extend of the generated defects. Differences between CFRP and GFRP materials are discussed.
Impulse thermography is an active method for quantitative investigations of the near
surface region of various structures. It has recently been applied and optimized to applications in civil
engineering. For quantitative analysis of data recorded on the building site, the problems are manifold.
Here, the influence of the different surface properties on the detection and characterization of voids
and honeycombing simulated by polystyrene cubes and cubes prepared of porous concrete are
demonstrated.