Applications of Carbon Fibre Reinforced Polymers (CFRP) at temperatures over 150–200 ◦C are becoming common in aerospace and automotive applications. Exposure of CFRP to these temperatures can lead to permanent changes in their mechanical properties. In this work, we investigated the effect of thermal ageing in air on the strength of carbon fabric/epoxy composites. To this end, accelerated artificial ageing at different temperatures was performed on carbon fabric/epoxy specimens. The flexural and interlaminar shear strengths of the aged specimens were assessed by three-point bending and short beam shear tests, respectively, and compared to those of unaged samples. For ageing at temperatures below the glass transition temperature of the resin, Tg, a moderate reduction of strength was found, with a maximum decrease of 25% for 2160 h at 75% Tg. On the other hand, a rapid strength decrease was observed for ageing temperatures above Tg. This was attributed to degradation of the epoxy matrix and of the fibre/epoxy interface. In particular, a 30% strength decrease was found for less than 6 h at 145% Tg. Therefore, it was concluded that even a short exposure to operating temperatures above Tg could substantially impair the load-carrying capability of CFRP components.

Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites / Nicola Zavatta, Francesco Rondina, Maria Pia Falaschetti, Lorenzo Donati. - In: POLYMERS. - ISSN 2073-4360. - ELETTRONICO. - 13:(2021), pp. 1-10. [10.3390/polym13122006]

Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites

Nicola Zavatta
Primo
;
Francesco Rondina
Secondo
;
Maria Pia Falaschetti
Penultimo
;
Lorenzo Donati
Ultimo
2021

Abstract

Applications of Carbon Fibre Reinforced Polymers (CFRP) at temperatures over 150–200 ◦C are becoming common in aerospace and automotive applications. Exposure of CFRP to these temperatures can lead to permanent changes in their mechanical properties. In this work, we investigated the effect of thermal ageing in air on the strength of carbon fabric/epoxy composites. To this end, accelerated artificial ageing at different temperatures was performed on carbon fabric/epoxy specimens. The flexural and interlaminar shear strengths of the aged specimens were assessed by three-point bending and short beam shear tests, respectively, and compared to those of unaged samples. For ageing at temperatures below the glass transition temperature of the resin, Tg, a moderate reduction of strength was found, with a maximum decrease of 25% for 2160 h at 75% Tg. On the other hand, a rapid strength decrease was observed for ageing temperatures above Tg. This was attributed to degradation of the epoxy matrix and of the fibre/epoxy interface. In particular, a 30% strength decrease was found for less than 6 h at 145% Tg. Therefore, it was concluded that even a short exposure to operating temperatures above Tg could substantially impair the load-carrying capability of CFRP components.
2021
Effect of Thermal Ageing on the Mechanical Strength of Carbon Fibre Reinforced Epoxy Composites / Nicola Zavatta, Francesco Rondina, Maria Pia Falaschetti, Lorenzo Donati. - In: POLYMERS. - ISSN 2073-4360. - ELETTRONICO. - 13:(2021), pp. 1-10. [10.3390/polym13122006]
Nicola Zavatta, Francesco Rondina, Maria Pia Falaschetti, Lorenzo Donati
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/858775
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