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Bewertung von Schallemissionssignalen mit Hilfe inverser Methoden zur Analyse von Schallquellengiometrien

: Kühnicke, H.; Kröning, M.

Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin:
Innovative ZfP - eine Herausforderung für die gesamte Industrie. Teil 1
Berlin, 1992 (DGZfP-Berichtsbände 33)
Deutsche Gesellschaft für Zerstörungsfreie Prüfung (Jahrestagung) <1992, Fulda>
Fraunhofer IZFP ()
acoustic emission; Ausbreitungsverhalten; computer simulation; Computersimulation; inverse method; inverses Verfahren; moment tensor; Momenttensor; Quellmechanismus; Schallemission; source mechanism; wave propagation behavior

Till now, the evaluation of acoustic emission (AE) events to be based on empirical connections between the source parameters and the measured radiation pattern. To obtain quantitative information on generating mechanisms, AE events have to be characterized using mathematical methods. Source characterization belongs to the inverse problem, which must be solved to determine crack mechanisms acting as acoustic emission sources. The measured radiation pattern of an AE source depends on its orientation and fracture mode. The radiation pattern can be represented by the moment tensor if the source dimensions are small compared with the elastic wave length (point source). The moment tensor contains the combination of forces which are responsible for the AE source. Computer simulations and first applications have been showed that the inverse method woks very well to sparate the moment tensor into its shear and tensile compondends. From these, orientation and displacement of the crack plane can be determined.