Polyimide thin-ply composite
Mechanical performance of composite structures is influenced by the accumulation of damage from the manufacturing process and throughout the whole service life. For instance, an aircraft is subjected to a combination of mechanical loading and the thermo-oxidative environment from the take-off to the...
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Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik
2018
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ndltd-UPSALLA1-oai-DiVA.org-ltu-701182018-08-15T05:39:55ZPolyimide thin-ply compositeengMOUANE, KHALIDLuleå tekniska universitet, Institutionen för teknikvetenskap och matematik2018Polyimidethin-plymicrocrackingcuring stressmechanical loadingMaterials EngineeringMaterialteknikMechanical performance of composite structures is influenced by the accumulation of damage from the manufacturing process and throughout the whole service life. For instance, an aircraft is subjected to a combination of mechanical loading and the thermo-oxidative environment from the take-off to the landing. Therefore, this degree project consists of studying the damage initiation and evolution in carbon fibre reinforced polyimide composites and assesses the thickness effect of the laminated composites. After manufacturing, the level of residual thermal stresses occurring at room temperature lead to the occurrence of microcracks in bundles of the quasi-isotropic composites. Further cooling to cryogenic temperature creates new cracks were appearing. This reinforces the conclusion that cracks are created due to thermal stresses. Comparison between a baseline composite made of carbon fibre T650 8-harness satin weave with thermosetting polyimide resin (ply thickness= 190µm) and thin-ply textile laminate made of Textreme carbon fibre IMS65 (ply thickness=83µm) with the same resin shows that the ply thickness has a significant effect on suppressing or delaying the occurrence and the propagation of microcracks after mechanical loading. It is assumed that there are some edge effects leading to different damage state in 90° and ±45° layers. Student thesisinfo:eu-repo/semantics/bachelorThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70118application/pdfinfo:eu-repo/semantics/openAccess |
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Others
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Polyimide thin-ply microcracking curing stress mechanical loading Materials Engineering Materialteknik |
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Polyimide thin-ply microcracking curing stress mechanical loading Materials Engineering Materialteknik MOUANE, KHALID Polyimide thin-ply composite |
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Mechanical performance of composite structures is influenced by the accumulation of damage from the manufacturing process and throughout the whole service life. For instance, an aircraft is subjected to a combination of mechanical loading and the thermo-oxidative environment from the take-off to the landing. Therefore, this degree project consists of studying the damage initiation and evolution in carbon fibre reinforced polyimide composites and assesses the thickness effect of the laminated composites. After manufacturing, the level of residual thermal stresses occurring at room temperature lead to the occurrence of microcracks in bundles of the quasi-isotropic composites. Further cooling to cryogenic temperature creates new cracks were appearing. This reinforces the conclusion that cracks are created due to thermal stresses. Comparison between a baseline composite made of carbon fibre T650 8-harness satin weave with thermosetting polyimide resin (ply thickness= 190µm) and thin-ply textile laminate made of Textreme carbon fibre IMS65 (ply thickness=83µm) with the same resin shows that the ply thickness has a significant effect on suppressing or delaying the occurrence and the propagation of microcracks after mechanical loading. It is assumed that there are some edge effects leading to different damage state in 90° and ±45° layers. |
author |
MOUANE, KHALID |
author_facet |
MOUANE, KHALID |
author_sort |
MOUANE, KHALID |
title |
Polyimide thin-ply composite |
title_short |
Polyimide thin-ply composite |
title_full |
Polyimide thin-ply composite |
title_fullStr |
Polyimide thin-ply composite |
title_full_unstemmed |
Polyimide thin-ply composite |
title_sort |
polyimide thin-ply composite |
publisher |
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik |
publishDate |
2018 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70118 |
work_keys_str_mv |
AT mouanekhalid polyimidethinplycomposite |
_version_ |
1718725251580297216 |