The acoustic emission (AE) technique, when used with the four-point bend test, is potentially an effective method for characterization of the ductility and fracture behaviour of certain thermally sprayed coatings. Monitoring of AE during such tests on brittle coatings reveals that the rate of the occurrence of events with increasing load changes gradually over the duration of the test. In this work, finite element modelling (FEM) of a brittle coating on an elastic substrate in four-point bending is used to analyze the fracture behaviour of the coating and predict its AE behaviour. The results from the FE analysis show good agreement with experimental data from four-point bending of thermally sprayed WC-Co coatings.

acoustic emission, brittle coating, finite element modelling, four-point bend testing, thermal spraying, tungsten carbide-cobalt coating
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Copyright © 2005 Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH. All rights reserved.
2005
ASM International
Topics
Four-point bend testing Thermal spray coating Finite element analysis Acoustic emission testing Tungsten carbide cermets
Issue Section:
Process Modeling and Simulation
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