Interaction-mechanisms of laser-generated plate- and shearwaves with imperfections in fibre-reinforced plastics

• Applicant: Professor Dr. Ralf Bernhard Bergmann
• Subject Area: Measurement Systems ; Materials in Sintering Processes and Generative Manufacturing Processes
• Term: from 2012 to 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 225209079

Transportation industry requires a reduction of structural weight with comparable security standards and longer maintenance intervals. This goal can be achieved through lightweight constructions and advanced materials. These materials show new and other defects compared to conventional materials. Therefore adapted or novel non-destructive testing (NdT) methods have to be developed. This project aims at the development of a suitable NdT-method for fast and contact-free testing of fibre-reinforced plastics (FRP) based on the measurement of plate- and shear-waves with pulsed shearography.The interpretation of the captured wave patterns requires the thorough understanding of the wavefield propagation as well as the interaction-mechanisms between the waves and defects in FRP-parts. With this inverse problem solved, it will be possible to extract information about the geometrical features (depth, size, form) from a single wave pattern at a well-defined instant of time. For the development of the method it is inevitable to investigate optimized laser-generated plate- and shear-wave generation with respect to the orientation-dependent sensitivity and measurement resolution.

• DFG Programme: Research Grants
• Participating Institution: Faserinstitut Bremen e.V. (FIBRE)
• Participating Person: Dr. Christoph von Kopylow