TO IDENTIFICATION THE LOCAL DEFORMATION DUE SCRATCH TEST OF THE COPPER POLYCRYSTALLINE
AbstractThe acoustic emission technique has been widely used during indentation or scratch testing. A common problem is that, when the elementary modes of deformation are of concern, the testing has to be performed locally. Such a testing model implies inevitably in a very small (microscopic) volume involved into plastic deformation under the indenter tip. Therefore, the AE generated during the test has a quite small amplitude hardly distinguishable on a background of the electric noise if the traditional threshold-based acquisition is utilized. With the specific aim at identifying and characterizing fundamental mechanisms of plastic deformation through analysis of AE signals, the present work seeks to offer new strategies in AE acquisition and processing during scratch testing of material to get a better insight on the elementary processes of local plastic deformation. The experiments have been performed on the model pure copper which has been well characterized microstructurally in the local area along the indented path using a scanning electron microscopy. The AE technique appears a viable and powerful tool for investigations of local deformation mechanisms in situ.
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