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Environmental Performance of Carbon Fibre Composites

TWI is working in collaboration on an EU funded project, MODCOMP, to explore new and innovative ways to modify and enhance carbon fibre composite structures. TWI is contributing its strong experience in the characterisation and testing of materials and surfaces.

Background

With the increasing usage of carbon fibre (CF), how it reacts to its environment is becoming more important, particularly with respect to changes in physical properties and ultimately the strength of the composite structure.

During the course of the MODCOMP project, the impact of environmental conditions - particularly UV/humidity - on composite performance will be assessed.

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Objective

The objective of the project is to explore the structural and surface degradation performance of composite material through exposure to a cyclic weathering test incorporating periods of UV exposure (8 hours UV-A, 60°C), followed by periods of condensation/humidity (4 hours , 50°C).

Surface analysis methods including optical microscopy, scanning electron microscopy, and white light interferometry have been used to study surface degradation

 

Programme of Work

TWI is currently performing tests to evaluate the extent of damage caused by long term exposure to UV/condensation.

The effect of matrix degradation can be observed along with exposure of the upper layers of carbon fibres.

On completion of further exposure, specimens will be subjected to mechanical tests to determine whether the degradation experienced will impact upon physical properties.

Future Developments

TWI is looking to perform further environmental studies, including thermal cycling, salt water immersion and humidity. The effect these environmental conditions may have on physical performance will also be studied further.

 

The MODCOMP project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 685844.

Figure 1a. White Light Interferometry of carbon fibre composite before accelerated weathering
Figure 1a. White Light Interferometry of carbon fibre composite before accelerated weathering
Figure 1b. White Light Interferometry of carbon fibre composite after 1000 hours accelerated weathering
Figure 1b. White Light Interferometry of carbon fibre composite after 1000 hours accelerated weathering
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