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Analysis of Acoustic Emissions for Determination of the Mechanical Effects of Scratch Tests

Version 2 2024-05-31, 10:30
Version 1 2022-10-26, 04:32
journal contribution
posted on 2024-05-31, 10:30 authored by T Devenport, Bernard RolfeBernard Rolfe, Michael PereiraMichael Pereira, JM Griffin
Acoustic Emission (AE) is a promising technique for measuring tool wear online and in real time. In this work, scratch tests were conducted to better understand the “pre-wear” AE response based on loading conditions that were not sufficient to generate galling. The scratch tests used the same type of indenter against two different sheet materials: aluminum and steel. The results showed that AE parameters such as the mean frequency, Centroid frequency and Shannon entropy outperformed other frequency domain techniques by discriminating between the two sheet materials in scratch tests. From the literature, the frequency region of interest was expected to be sub 300 kHz. However, in this study, activity below this threshold was found to be noise, whereas distinct frequencies were found at much higher frequencies than expected. These results are compared against single grit “SG” tests of both mild steel- and nickel-based superalloys to allow comparison of the two test methods and materials used. This comparison showed that the SG tests excited the acoustic emission in ways in which the scratch tests did not. Another factor when using acoustic emissions to monitor sheet metal forming is the differences obtained in energy–frequency mapping, where many report the galling phenomena between a certain amplitude and frequency range. Such results are specific to the setup and the materials/geometries used. Further work presented here compares different scratch tests where energy–frequency mapping is different for different materials/geometries.

History

Journal

Applied Sciences

Volume

12

Article number

6724

Pagination

1-22

Location

Basel, Switzerland

ISSN

2076-3417

eISSN

2076-3417

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Issue

13

Publisher

MDPI