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New cutting-edge thermoplastic materials for the aerospace sector
by Staff Writers
Madrid, Spain (SPX) Apr 07, 2022

New cutting-edge thermoplastic materials for the aerospace sector

The Universidad Carlos III de Madrid (UC3M) coordinates the HITCOMP (High Temperature Characterisation and Modelling of Thermoplastic Composites) project within the Horizon 2020 programme, which aims to study the possible advantages of thermoplastic materials in the aerospace industry.

The European aerospace sector typically uses low-weight, high-performance thermosetting plastic composites-also known as epoxy resin based composites-in many applications. However, these materials are not as heat resistant as other metal aircraft components, which can compromise safety in situations where extreme temperatures are reached. In an effort to improve the current thermosetting composites' behaviour in the face of heat damage, the HITCOMP research team has proposed an alternative: the use of new PAEK resins-based thermoplastic materials.

During the development of the HITCOMP project, components made from a thermoplastic base have been shown to be more efficient, from the perspective of their thermal properties, than thermosetting composites. A known property that makes them very useful is that they can be recast, reshaped, processed and recycled, without the need for any additional curing process in order to harden and set.

In addition, they are more versatile, cheaper and eco-friendly materials than conventional thermosetting composites and have a longer service life, thanks to their high resilience -they can be recycled or repaired more easily- and fatigue resistance -wear and tear- and corrosion. The introduction of these materials would mean having safer and lighter aircraft which consume less fuel, improve energy efficiency and reduce their emissions.

To get the most out of thermoplastics in the aerospace industry, due to their capacity to melt and deform when overheated, it is necessary to determine their behaviour when subjected to heat, fire and mechanical loads.

The HITCOMP project has developed a test laboratory with new infrared (IR) thermography techniques in order to obtain accurate and non-intrusive measurements of the actual temperature of materials during fire tests. The ultimate aim is to conduct virtual tests on thermoplastics and compare their performance in real applications with those of conventional thermosetting composites.

"The aerospace sector is undergoing a transition to a more electric aircraft. This involves more heat and eventually fire sources, increasing the heating effect on the structure", explains Fernando Lopez, lead researcher and coordinator of the HITCOMP project, from the UC3M Department of Physics.

"In this context, our project aims to establish an innovative methodology which allows a characterisation of thermoplastics that involves fewer resources and improves the prediction of their behaviour and resistance when subjected to mechanical loads or fire and high temperatures."

The measurements obtained by infrared thermography allow computer simulations to be carried out, which virtualize testing to select this type of material in the aeronautical industry. Its implementation is expected to "significantly reduce the number of validation tests, which are mandatory and greatly increase the cost and delay the approval of this type of material in the industry." The IR models and equipment have already been transferred to the Airbus company so that it can study their industrial application.

During the research process, the team has also developed a new method -inspired by the previous results of UC3M's Sensors, Remote Detection and Infrared Imaging Laboratory (LIR-InfraRed LAB)- which allows the use of these infrared imaging techniques to remotely determine the thermal properties of these materials, without contact.

The HITCOMP project has been funded by the Horizon 2020 programme as part of the 2020 call for proposals for Research and Innovation Actions (RIA), and is part of the 2019 European Union Clean Sky 2 announcement. Likewise, it is supported by the Spanish National Institute of Aerospace Technology (INTA, in its Spanish acronym), the high-tech IR company, Sensia Solutions and the Airbus Fire Lab.

Related Links
Universidad Carlos III de Madrid
Space Technology News - Applications and Research

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