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Microdamage analysis in thermally aged CF/polyimide laminates
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
RISE - Research Institutes of Sweden (2017-2019), Materials and Production, SICOMP. Luleå University of Technology, Sweden.
2016 (English)In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 139, no 1, article id 012050Article in journal (Refereed) Published
Abstract [en]

Microdamage in layers of CF Thornel® T650 8-harness satin woven composite with thermosetting polyimide NEXIMID® MHT-R resin was analysed. After cooling to room temperature multiple intra-bundle cracking due to tensile transverse thermal stresses was observed in the studied [(+45/-45)/(90/0)]2s composite. The composite was subjected to thermal cycling quantifying the increase of crack density in layers. Comparison of two ramps with the same lowest temperature shows that the highest temperature in the cycle has a significant detrimental effect. Exposure for 40 days to 288°C caused many new cracks after cooling down to room temperature. Both aged and not aged specimens were tested in uniaxial quasi-static tension. Cracking was analysed using fracture mechanics and probabilistic approaches. Cracking in off-axis layers was predicted based on Weibull analysis of the 90- layer. The thermal treatment degraded the cracking resistance of the surface layer and of the next layer.

Place, publisher, year, edition, pages
2016. Vol. 139, no 1, article id 012050
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35121DOI: 10.1088/1757-899X/139/1/012050Scopus ID: 2-s2.0-84989345037OAI: oai:DiVA.org:ri-35121DiVA, id: diva2:1245940
Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2020-02-04

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CiteExportLink to record
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