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Wednesday, July 10 • 11:50 - 12:10
EFFECTS OF HYGRO-THERMAL AGEING ON POLYMER COMPOSITES USING ACOUSTIC WAVE PROPAGATION TECHNIQUES

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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 research 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 hygrothermal (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 hygro-thermal ageing was studied through a set of experimental tests in the laboratory using high frequency acoustic wave propagation techniques. The influence of HT on ultrasonic attenuation coefficient, acoustic stress wave parameters, thermal cooling rate and also 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.

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avatar for Daniel Pereira

Daniel Pereira

Postdoc, École de technologie supérieure (ÉTS)

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Wednesday July 10, 2019 11:50 - 12:10 EDT
Westmount 1

Attendees (2)