Abstract
This work develops a modulated nonlinear elastic wave spectroscopy (NEWS) method for the evaluation of a metallic components residual fatigue life. An aluminium specimen (AA6082-T6) was tested at predetermined points throughout its fatigue life using a dual-frequency ultrasound method. A modulated nonlinear parameter was derived, which described the relationship between the generation of modulated (sideband) responses of a dual frequency signal and the linear response. The sideband generation from the dual frequency was shown to increase as the residual fatigue life decreased, and as a standalone measurement method it can be used to show an increase in a materials damage. Although analytical evaluation of the method was required to develop a baseline-free method, work done by Meo and Amerini combined the Paris law and the Nazarov-Sutin crack equation developing the theoretical model. The results showed good correlation between the derived theoretical model and the modulated nonlinear parameter, allowing for material residual fatigue life estimation.
| Original language | English |
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| Publication status | Published - 2013 |
| Event | The 9th International Workshop on Structural Health Monitoring - Duration: 9 Sept 2018 → … |
Conference
| Conference | The 9th International Workshop on Structural Health Monitoring |
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| Period | 9/09/18 → … |