Experimental characterization of tensile properties of epoxy resin by using micro-fiber specimens

Author(s)Misumi, Jun
Author(s)Ganesh, Raja
Author(s)Sockalingam, Subramani
Author(s)Gillespie, John W. Jr.
Ordered AuthorJun Misumi, Raja Ganesh, Subramani Sockalingam, John W Gillespie
UD AuthorMisumi, Junen_US
UD AuthorGanesh, Rajaen_US
UD AuthorSockalingam, Subramanien_US
UD AuthorGillespie, John W. Jren_US
Date Accessioned2017-04-07T14:09:45Z
Date Available2017-04-07T14:09:45Z
Copyright DateCopyright © 2016 Sage Publicationsen_US
Publication Date2016-09-21
DescriptionAccepted manuscripten_US
AbstractIn unidirectional carbon fiber-reinforced plastic laminates, the distance between fibers can varies from submicron to micron length scales. The mechanical properties of the matrix at this length scale are not well understood. In this study, processing methods have been developed to produce high quality epoxy micro-fibers with diameters ranging from 100 to 150 µm that are used for tensile testing. Five types of epoxy resin systems ranging from standard DGEBA to high-crosslink TGDDM and TGMAP epoxy systems have been characterized. Epoxy macroscopic specimens with film thickness of 3300 µm exhibited brittle behavior (1.7 to 4.9% average failure strain) with DGEBA resin having the highest failure strain level. The epoxy micro-fiber specimens exhibited significant ductile behavior (20 to 42% average failure strain) with a distinct yield point being observed in all five resin systems. In addition, the ultimate stress of the highly cross-linked TGDDM epoxy fiber exceeded the bulk film properties by a factor of two and the energy absorption was over 50 times greater on average. The mechanism explaining the dramatic difference in properties is discussed and is based on size effects (the film volume is about 2000 times greater than the fiber volume within the gage sections) and surface defects. Based on the findings presented in this paper, the microscale fiber test specimens are recommended and provide more realistic stress–strain response for describing the role of the matrix in composites at smaller length scales.en_US
DepartmentUniversity of Delaware. Center for Composite Materials.en_US
DepartmentUniversity of Delaware. Department of Mechanical Engineering.en_US
DepartmentUniversity of Delaware. Department of Materials Science and Engineering.en_US
DepartmentUniversity of Delaware. Department of Civil and Environmental Engineering.en_US
CitationMisumi, Jun, et al. "Experimental characterization of tensile properties of epoxy resin by using micro-fiber specimens." Journal of Reinforced Plastics and Composites 35.24 (2016): 1792-1801.en_US
DOIDOI: https://doi.org/10.1177/0731684416669248en_US
ISSN0731-6844 ; e- 1530-7964en_US
PublisherSage Publicationsen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceJournal of Reinforced Plastics and Compositesen_US
TitleExperimental characterization of tensile properties of epoxy resin by using micro-fiber specimensen_US
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