idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
Fraunhofer IZFP offers its customers and research partners the entire range of nondestructive testing technologies, whether it involves basic or applied research. The institute's researchers, engineers and technicians develop solutions to address modern testing applications including feasibility studies, consulting, training and inspection services and creating prototype systems. From June 13 to 17, 2016, Fraunhofer IZFP will present experiments regarding the simulation of ultrasonic materials evaluation in complex media at the 19th World Conference on Non-Destructive Testing (WCNDT) in Munich.
Nondestructive testing and evaluation of complex materials and components require efficient simulation techniques on the basis of appropriate physical models. To evaluate and optimize the performance of ultrasonic inspection and evaluation procedures, we employ a method based on Huygens’ principle, the Generalized Point Source Superposition technique (GPSS).
This technique allows to simulate the propagation of ultrasonic waves and their interaction with defects and impurities in media with isotropic as well as anisotropic material properties. In this contribution we first explain the main ‘ingredients’ of the simulation procedure and show various validation results.
On this basis, we then address the combination of GPSS with the theoretical description of ultrasonic scattering phenomena in microscopically inhomogeneous media previously refined by Hirsekorn [1], which is particularly interesting e.g. for coarse-grained cast materials. The scattering theory includes phenomena like directional and position dependent scattering effects in a macroscopically isotropic polycrystalline material. By combining GPSS and the scattering theory we obtain a better agreement of simulated and experimental results. We report on our approach to consider realistic microstructural features and show representative results, e.g. the investigation of the influence of the grain size on the simulation.
[1] S. Hirsekorn, "Calculations on Ultrasonic Scattering in Polycrystalline Structures Aiming for Simulations on Nondestructive Materials Characterization and Defect Detection", 11th European Conference on Nondestructive Testing ECNDT 2014, Prague, Czech Republic, Oct 06-10, 2014; NDT.net issue Vol. 19 No. 12 (Dec 2014)
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