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Degradation of Polyimide Composites under Thermo-Oxidative Ageing
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

High-temperature resins such as polyimides are used in the aerospace industry on account of their thermal stability and property retention at high temperatures. To understand the degradation of a polyimide and carbon fibre composite at high temperatures, samples were aged in air at 350°C for 300 hours. Weight loss was tracked throughout the ageing time and stepwise loading/unloading tensile tests were performed on selected samples. A significant amount of degradation was observed in all samples, with those that had been post-cured faring slightly worse. Crack density increased with ageing time and it was found that aged samples developed fewer new cracks when subjected to loading compared to pristine samples, due to the interaction of damage already incurred by ageing. The high degree of resin loss in the samples established that the material is not stable at 350°C and recommendations have been made for further work to understand more clearly the material response.

Place, publisher, year, edition, pages
2015. , 39 p.
Keyword [en]
Technology, composite materials, polyimide, ageing
Keyword [sv]
URN: urn:nbn:se:ltu:diva-56815Local ID: d8e982e7-23a0-4a7a-87c2-2a9be7572fccOAI: diva2:1030202
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20150626 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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