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

Journal article (2018)

Authors

M. Saeedifar Amirkabir University of Technology, Structural Integrity & Composites - Aerospace Engineering
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
Research Group
Structural Integrity & Composites (Aerospace Engineering) (TU Delft)
Copyright: © 2018 M. Saeedifar, Mehdi Ahmadi Najafabadi, Kaivan Mohammadi, Mohamad Fotouhi, Hossein Hosseini Toudeshky, Mohammad Reza Shah Mohammadi
DOI: https://doi.org/10.1007/s10921-017-0454-0
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Published Date

01-03-2018

Language

English

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Structural Integrity & Composites

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.