Acoustic Emission-Based Methodology to Evaluate Delamination Crack Growth Under Quasi-static and Fatigue Loading Conditions

Saeedifar, Milad; Ahmadi Najafabadi, Mehdi; Mohammadi, Kaivan; Fotouhi, Mohamad; Hosseini Toudeshky, Hossein; Mohammadi, Reza

Abstract

© 2017, The Author(s). 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.

• Journal Article Type: Article
• Acceptance Date: Oct 26, 2017
• Online Publication Date: Nov 16, 2017
• Publication Date: Mar 1, 2018
• Deposit Date: Jan 17, 2018
• Publicly Available Date: Nov 16, 2018
• Journal: Journal of Nondestructive Evaluation
• Print ISSN: 0195-9298
• Electronic ISSN: 1573-4862
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 37
• Issue: 1
• DOI: https://doi.org/10.1007/s10921-017-0454-0
• Keywords: quasi-static, fatigue, delamination, acoustic, emission, fatigue, crack, growth
• Public URL: https://uwe-repository.worktribe.com/output/875828
• Publisher URL: http://dx.doi.org/10.1007/s10921-017-0454-0
• Additional Information: Additional Information : This is the peer reviewed version of the following article: Saeedifar, M., Ahmadi Najafabadi, M., Mohammadi, K., Fotouhi, M., Hosseini Toudeshky, H. and Mohammadi, R. (2018) Acoustic emission-based methodology to evaluate delamination crack growth under quasi-static and fatigue loading conditions. Journal of Nondestructive Evaluation, 37 (1). ISSN 0195-9298, which has been published in final form at http://dx.doi.org/10.1007/s10921-017-0454-0. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
• Contract Date: Jan 17, 2018