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Effect of extreme temperatures on micro-damage development in CF/polyimide laminates
Luleå University of Technology, Sweden.
RISE, Swerea, SICOMP. Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
2015 (English)In: ICCM International Conferences on Composite Materials, International Committee on Composite Materials , 2015Conference paper, Published paper (Refereed)
Abstract [en]

CF Thornel® T650 8-harness satin weave fabric composite with thermosetting polyimide NEXIMID® MHT-R resin designed for high service temperatures is produced at around 390°C and therefore high thermal stresses develop after cooling down to room temperature. Thermal transverse stresses in bundles/layers are tensile and lead to multiple intra-bundle /intra-laminar cracking. When the composite plate is subjected to large and repeated temperature variations, new cracks can appear due to thermally induced fatigue stress. Experimental results show that the highest temperature in the cycle, where thermal stresses are low, has a significant detrimental effect on thermal fatigue resistance. Another observed phenomenon is thermal aging: at high temperature the mechanical properties are degrading with time. Aging and fatigue effects were separately analyzed for quasi-isotropic laminates with lay-up [(+45/-45)/(90/0)]2s. 

Place, publisher, year, edition, pages
International Committee on Composite Materials , 2015.
Keywords [en]
CF/polyimide, Micro-damage, Thermal aging, Thermal fatigue
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42213Scopus ID: 2-s2.0-85053147471OAI: oai:DiVA.org:ri-42213DiVA, id: diva2:1379722
Conference
20th International Conference on Composite Materials, ICCM 2015, 19 July 2015 through 24 July 2015
Note

Funding text 1: This study was financially supported by EXCELL project, “Increased competitiveness and visibility of Composite Centre Sweden through excellence in bio-nano multi-scale composites and high-temperature composites” funded by local government Norbotten, SWEDEN. Swerea SICOMP is acknowledged for their help with manufacturing of materials.

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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