Properties of novel bismaleimide resins and thermal ageing effects on the ILSS performance of their carbon fibre–bismaleimide composites

2018 ◽  
Vol 40 (S2) ◽  
pp. E1283-E1293 ◽  
Author(s):  
Siyang Liu ◽  
Yizi Chen ◽  
Ping Chen ◽  
Dongwei Xu ◽  
Xuhai Xiong ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Thermal Ageing ◽  
Ageing Effects ◽  
Bismaleimide Resins

scholarly journals Effect of Thermal Ageing on the Impact Damage Resistance and Tolerance of Carbon-Fibre-Reinforced Epoxy Laminates

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 160 ◽  
Author(s):  
Irene García-Moreno ◽  
Miguel Caminero ◽  
Gloria Rodríguez ◽  
Juan López-Cela
Keyword(s):  
Carbon Fibre ◽  
Residual Strength ◽  
Composite Structures ◽  
Impact Resistance ◽  
Thermal Ageing ◽  
Low Velocity Impact ◽  
Impact Tests ◽  
Compression After Impact ◽  
Structural Applications ◽  
The Impact

Composite structures are particularly vulnerable to impact, which drastically reduces their residual strength, in particular, at high temperatures. The glass-transition temperature (Tg) of a polymer is a critical factor that can modify the mechanical properties of the material, affecting its density, hardness and rigidity. In this work, the influence of thermal ageing on the low-velocity impact resistance and tolerance of composites is investigated by means of compression after impact (CAI) tests. Carbon-fibre-reinforced polymer (CFRP) laminates with a Tg of 195 °C were manufactured and subjected to thermal ageing treatments at 190 and 210 °C for 10 and 20 days. Drop-weight impact tests were carried out to determine the impact response of the different composite laminates. Compression after impact tests were performed in a non-standard CAI device in order to obtain the compression residual strength. Ultrasonic C-scanning of impacted samples were examined to assess the failure mechanisms of the different configurations as a function of temperature. It was observed that damage tolerance decreases as temperature increases. Nevertheless, a post-curing process was found at temperatures below the Tg that enhances the adhesion between matrix and fibres and improves the impact resistance. Finally, the results obtained demonstrate that temperature can cause significant changes to the impact behaviour of composites and must be taken to account when designing for structural applications.

Fracture behaviour of hybrid glass matrix composites: thermal ageing effects

2003 ◽  
Vol 34 (12) ◽  
pp. 1177-1185 ◽  
Author(s):  
I. Dlouhy ◽  
Z. Chlup ◽  
D.N. Boccaccini ◽  
S. Atiq ◽  
A.R. Boccaccini
Keyword(s):  
Glass Matrix ◽  
Fracture Behaviour ◽  
Thermal Ageing ◽  
Matrix Composites ◽  
Ageing Effects ◽  
Glass Matrix Composites

Thermal Ageing Effects in a Commercial Three-Way Catalyst: Physical Characterization of Washcoat and Active Metal Evolution

2020 ◽  
Vol 21 (2) ◽  
pp. 329-337 ◽  
Author(s):  
Mattia Giuliano ◽  
Gabriele Ricchiardi ◽  
Alessandro Damin ◽  
Mauro Sgroi ◽  
Giovanna Nicol ◽  
...  
Keyword(s):  
Thermal Ageing ◽  
Physical Characterization ◽  
Ageing Effects ◽  
Active Metal ◽  
Three Way Catalyst

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

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2006
Author(s):  
Nicola Zavatta ◽  
Francesco Rondina ◽  
Maria Pia Falaschetti ◽  
Lorenzo Donati
Keyword(s):  
Carbon Fibre ◽  
Thermal Ageing ◽  
Epoxy Composites ◽  
Short Exposure ◽  
Artificial Ageing ◽  
Carbon Fabric ◽  
Beam Shear ◽  
Maximum Decrease ◽  
Different Temperatures ◽  
Interlaminar Shear

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.

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