Acoustic Emission-Based Methodology to Evaluate Delamination Crack Growth Under Quasi-static and Fatigue Loading Conditions
Milad Saeedifar (TU Delft - Structural Integrity & Composites, Amirkabir University of Technology)
Mehdi Ahmadi Najafabadi (Amirkabir University of Technology)
Kaivan Mohammadi (Sharif University of Technology)
Mohamad Fotouhi (University of the West of England)
Hossein Hosseini Toudeshky (Amirkabir University of Technology)
Mohammad Reza Shah Mohammadi (Amirkabir University of Technology)
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Abstract
The aim of this study was to investigate the applicability of acoustic emission (AE) technique to evaluate delamination crack in glass/epoxy composite laminates under quasi-static and fatigue loading. To this aim, double cantilever beam specimens were subjected to mode I quasi-static and fatigue loading conditions and the generated AE signals were recorded during the tests. By analyzing the mechanical and AE results, an analytical correlation between the AE energy with the released strain energy and the crack growth was established. It was found that there is a 3rd degree polynomial correlation between the crack growth and the cumulative AE energy. Using this correlation the delamination crack growth was predicted under both the static and fatigue loading conditions. The predicted crack growth values was were in a good agreement with the visually recorded data during the tests. The results indicated that the proposed AE-based method has good applicability to evaluate the delamination crack growth under quasi-static and fatigue loading conditions, especially when the crack is embedded within the structure and could not be seen visually.
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