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NDT.net Issue - 2013-12 - Articles
NDT.net Issue: 2013-12
Publication: 5th International Symposium on NDT in Aerospace, 13-15th November 2013, Singapore (AeroNDT 2013)
Session: Ultrasonics and Acoustics
ARTICLE

Interlaminar fracture characterization in composite materials by using acoustic emission

Ian Silversides1, Ahmed Maslouhi23, Gabriel Laplante2
1University of Sherbrooke40, Sherbrooke, Canada
2Department of Mechanical Engineering; University of Moncton2, Moncton, New Brunswick, Canada

Abstract: This paper proposes experimental approaches to evaluate interlaminar fracture resistance and use acoustic emission (AE) monitoring technique to detect the onset of delamination in real time and to determine mixed mode delamination initiation criteria. The main objective is to exploit damage onset surveillance by detecting ultrasonic stress waves generated by growing interlaminar cracks within composite, to measure delamination toughness in pure mode I and II opening and over a wide range of mode I / mode II ratios. Double Cantilever Beam (DCB), End-Notch Flexure (ENF) and Mixed Mode Bending (MMB) samples were used to calculate strain critical energy release rates for mode I, mode II and mixed mode loading. The total strain energy release rate G and its mode I (GI) and mode II (GII) components were evaluated using beam theory for the DCB and MMB samples and load based compliance calibration for the ENF sample. These results were compared to a finite element model using the Virtual Crack Closure Technique (VCCT). The mode I energy was plotted against mode II in order to outline failure envelopes, which may enable the prediction of delamination onset in composite materials.

Keywords: Acoustic Emission (AE) (1355), composite (573), Delamination onset (2), fatigue crack growth. (1), mixed modes I and II (1), Acoustic-Emission (1), virtual crack closure techniques (1),
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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