Acoustic Emission application to detect nanoscale fracture on polymers with self-healing ability

Speaker:
Tsangouri, Eleni; Vrije Universiteit Brussel; Belgium

Authors:
Tsangouri, E.; Vrije Universiteit Brussel; Belgium
Muruzabal, A.T.; Vrije Universiteit Brussel; Belgium
Rahier, H.; Vrije Universiteit Brussel; Belgium
Aggelis, D.G.; Vrije Universiteit Brussel; Belgium

ID: ECNDT-0455-2018
Download: PDF
Session: Composite Material - AE
Room: G1
Date: 2018-06-12
Time: 09:20 - 09:40

One of the most promising technologies of today concerns the inclusion of nanochannels into polymer in order to develop composites with self-healing ability. Nanochannels carry healing agent that aims to fill and repair cracks at micro-scale. The damage processes of nanochannels reinforced polymers is complex and differentiates from pure polymer. In-depth damage assessment remains challenging since there is no testing procedure that permits crack arrest at micro-scale. In practice, the mechanical response of nanochannel polymers is measured applying fatigue regime simulating loading cycles in service life. But the moment that stiffness degradation is detected there is extended macrocracking due to brittle nature of polymers. In other words, stiffness degradation cannot be considered as guide to arrest testing at crack nucleation stage. To overcome this issue, Acoustic Emission technique is applied during fatigue tests in order to monitor early stage damage. Based on acoustic wave features analysis, the test stops as soon as fracture process zone forms and before degradation in stiffness is measured.