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Effects of hygro-thermal ageing on polymer composites using acoustic wave propagation techniques

Bagale Neelesh, C and Bhat, MR (2019) Effects of hygro-thermal ageing on polymer composites using acoustic wave propagation techniques. In: Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019, 7-11July 2019, Montreal; Canada.

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Abstract

Advanced polymer composite materials are replacing metals for high performance structural applications in aerospace, automotive and other industries owing to their specific performance characteristics such as higher specific strength and specific modulus. However, during service, these materials undergo rigorous temperature and moisture changes that lead to hygro-thermal ageing. This can have a detrimental effect on the performance of the structural components made out of polymer composite materials. This paper presents the work carried out through experimental approach using Acoustic Wave Propagation techniques to investigate hygro-thermal ageing of Carbon Fiber Reinforced Polymer (CFRP) Composites. CFRP composite laminates were fabricated by a simple hand lay-up procedure in the laboratory. For hygro-thermal (HT) treatment composite specimens were immersed in a hot water bath for varied durations. This treatment on specimens causes plasticization of the matrix resulting in loss of stiffness. Degradation thus caused in the composite materials due to ageing was studied through a set of experimental tests in the laboratory using high frequency acoustic wave propagation techniques. The effects of HT on ultrasonic attenuation coefficient, acoustic stress wave parameters, and on mechanical properties were investigated. The trend of water absorption in this composite material has been found to show a Fickian behaviour reaching saturation beyond a certain time period. The attenuation coefficients and other wave characteristics have been found to be strongly affected by HT treatment. Further, to have a measure of influence of HT on mechanical properties, flexural tests were carried out. Flexural strength and modulus thus obtained have shown a significant reduction due to hygro-thermal ageing © Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019. All rights reserved.

Item Type: Conference Paper
Publication: Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
Publisher: Canadian Acoustical Association
Additional Information: cited By 0; Conference of 26th International Congress on Sound and Vibration, ICSV 2019 ; Conference Date: 7 July 2019 Through 11 July 2019; Conference Code:151920
Keywords: Acoustic waves; Acoustics; Carbon fiber reinforced plastics; Composite materials; Glass ceramics; Laminated composites; Mechanical properties; Nondestructive examination; Polymers; Stiffness matrix; Structural metals; Thermal aging; Ultrasonic testing; Water absorption, Advanced polymer composite materials; Carbon fiber reinforced polymer composite; Experimental approaches; High-frequency acoustic waves; Hygro-thermal; Performance characteristics; Polymer composite materials; Structural applications, Acoustic wave propagation
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 23 Nov 2020 07:14
Last Modified: 23 Nov 2020 07:14
URI: http://eprints.iisc.ac.in/id/eprint/65393

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