Damage Signature of Fatigued Fabric Reinforced Plastics in the Pulsed Ultrasonic Polar Scan |
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Authors: | M Kersemans I De Baere J Degrieck K Van Den Abeele L Pyl F Zastavnik H Sol W Van Paepegem |
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Institution: | 1. Department of Materials Science and Engineering, Ghent University, Technologiepark-Zwijnaarde 903, 9052, Zwijnaarde, Belgium 2. Department of Physics, Catholic University of Leuven - KULAK, Etienne-Sabbelaan 52, 8500, Kortrijk, Belgium 3. Department Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussels, Belgium
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Abstract: | This study investigates the use of both the amplitude and time-of-flight based pulsed ultrasonic polar scan (P-UPS) for the nondestructive detection and evaluation of fatigue damage in fabric reinforced composites. Several thermoplastic carbon fabric reinforced PPS specimens (CETEX), loaded under various fatigue conditions, have been scanned at multiple material spots according to the P-UPS technique in order to extract material degradation in a quantitative way. The P-UPS results indicate that shear dominated fatigued carbon/PPS goes with a reduction of shear properties combined with large fiber distortions. The P-UPS results of the tension-tension fatigued carbon/PPS samples on the other hand reveal a directional degradation of the stiffness properties, reaching a maximum reduction of ?12.8 % along the loading direction. The P-UPS extracted damage characteristics are fully supported by simulations, conventional destructive tests as well as visual inspection. The results demonstrate the excellent capability of the P-UPS method for nondestructively assessing and quantifying both shear-dominated and tension-tension fatigue damage in fabric reinforced plastics. |
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