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3-D fem modeling of fiber/matrix interface debonding in UD composites including surface effects
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2012 (English)In: 6th EEIGM International Conference Advanced Materials Research: 7th and 8th November, 2011 EEIGM, Nancy, France, Bristol: IOP Publishing Ltd , 2012Conference paper (Refereed)
Abstract [en]

Fiber/matrix interface debond growth is one of the main mechanisms of damage evolution in unidirectional (UD) polymer composites. Because for polymer composites the fiber strain to failure is smaller than for the matrix multiple fiber breaks occur at random positions when high mechanical stress is applied to the composite. The energy released due to each fiber break is usually larger than necessary for the creation of a fiber break therefore a partial debonding of fiber/matrix interface is typically observed. Thus the stiffness reduction of UD composite is contributed both from the fiber breaks and from the interface debonds. The aim of this paper is to analyze the debond growth in carbon fiber/epoxy and glass fiber/epoxy UD composites using fracture mechanics principles by calculation of energy release rate GII. A 3-D FEM model is developed for calculation of energy release rate for fiber/matrix interface debonds at different locations in the composite including the composite surface region where the stress state differs from the one in the bulk composite. In the model individual partially debonded fiber is surrounded by matrix region and embedded in a homogenized composite.

Place, publisher, year, edition, pages
Bristol: IOP Publishing Ltd , 2012.
, I O P Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; 31
Research subject
Polymeric Composite Materials
URN: urn:nbn:se:ltu:diva-29311DOI: 10.1088/1757-899X/31/1/012001Local ID: 2bf775fb-8d4b-4f8e-a00f-ab32aa8d87a4OAI: diva2:1002534
EEIGM International Conference on Advanced Materials Research : 11/06/2015 - 12/06/2015
Validerad; 2012; Bibliografisk uppgift: Article number 012001 ; 20111206 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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