Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-Series
Acoustic emission (AE) is a powerful tool for investigating the intermittency of plastic flow by capturing elastic waves generated by dislocation rearrangements under load. This study explores the correlation between AE and plastic instabilities, such as Lüders bands, the Portevin–Le Chatelier (PLC)...
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2025-01-01
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| author | Alexey Vinogradov |
| author_facet | Alexey Vinogradov |
| author_sort | Alexey Vinogradov |
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| description | Acoustic emission (AE) is a powerful tool for investigating the intermittency of plastic flow by capturing elastic waves generated by dislocation rearrangements under load. This study explores the correlation between AE and plastic instabilities, such as Lüders bands, the Portevin–Le Chatelier (PLC) effect, and necking, each showing distinct AE signatures. Lüders and PLC bands generate significant AE during discontinuous yielding, with a sharp rise in AE levels and a shift in the spectrum to lower frequencies—characteristic of localized deformation. In contrast, necking exhibits limited AE activity, due to reduced strain hardening and dislocation mobility during late-stage deformation. A phenomenological model, based on dislocation dynamics and initially devised for uniform deformation, is discussed to explain the observed AE spectral features during localized plastic flow. This study underscores AE’s potential for non-destructive evaluation and failure prediction in structural metals, emphasizing its sensitivity to microstructural changes and instabilities. Understanding AE behavior across deformation stages offers valuable insights into improving material reliability and predicting failure. |
| format | Article |
| id | doaj-art-6ac12dfaa8e246cdbd17d8ccba313be9 |
| institution | Kabale University |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-6ac12dfaa8e246cdbd17d8ccba313be92025-01-24T13:41:30ZengMDPI AGMetals2075-47012025-01-011514610.3390/met15010046Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-SeriesAlexey Vinogradov0Magnesium Research Center (MRC), Kumamoto University, Kumamoto 860-8555, JapanAcoustic emission (AE) is a powerful tool for investigating the intermittency of plastic flow by capturing elastic waves generated by dislocation rearrangements under load. This study explores the correlation between AE and plastic instabilities, such as Lüders bands, the Portevin–Le Chatelier (PLC) effect, and necking, each showing distinct AE signatures. Lüders and PLC bands generate significant AE during discontinuous yielding, with a sharp rise in AE levels and a shift in the spectrum to lower frequencies—characteristic of localized deformation. In contrast, necking exhibits limited AE activity, due to reduced strain hardening and dislocation mobility during late-stage deformation. A phenomenological model, based on dislocation dynamics and initially devised for uniform deformation, is discussed to explain the observed AE spectral features during localized plastic flow. This study underscores AE’s potential for non-destructive evaluation and failure prediction in structural metals, emphasizing its sensitivity to microstructural changes and instabilities. Understanding AE behavior across deformation stages offers valuable insights into improving material reliability and predicting failure.https://www.mdpi.com/2075-4701/15/1/46plastic instabilitiesLüders bandsPortevin-Le Chatelier effectneckingstrain localizationacoustic emission |
| spellingShingle | Alexey Vinogradov Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-Series Metals plastic instabilities Lüders bands Portevin-Le Chatelier effect necking strain localization acoustic emission |
| title | Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-Series |
| title_full | Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-Series |
| title_fullStr | Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-Series |
| title_full_unstemmed | Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-Series |
| title_short | Signatures of Plastic Instabilities and Strain Localization in Acoustic Emission Time-Series |
| title_sort | signatures of plastic instabilities and strain localization in acoustic emission time series |
| topic | plastic instabilities Lüders bands Portevin-Le Chatelier effect necking strain localization acoustic emission |
| url | https://www.mdpi.com/2075-4701/15/1/46 |
| work_keys_str_mv | AT alexeyvinogradov signaturesofplasticinstabilitiesandstrainlocalizationinacousticemissiontimeseries |