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Steady-State Debond Growth Along Broken Fibers in Unidirectional Composites During Cyclic Loading
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2013 (English)In: 9th International Conference on Composite Science and Technology: 2020 - Scientific and Technical Challenges / [ed] Michelle Meo, Lancaster: PA Destech Publications Inc. , 2013, 981-983 p.Conference paper (Refereed)
Abstract [en]

Several regions with different governing failure mechanisms may be distinguished analyzing axial tension-tension cyclic loading of unidirectional (UD) composite. At high loads multiple fiber fracture takes place during the first loading cycle. The relative number of broken fibers depends on the maximum stress and can be estimated assuming that the fiber strength is a statistical property following Weibull distribution. Multiple fiber fracture (fragmentation) is possible because the load is transferred into the broken fiber through the interface. In cyclic loading with constant amplitude we usually assume that fibers do not experience fatigue and all fiber breaks occur during the first cycle. During the following cyclic loading debonds start to grow along the fiber/matrix interface and this is the main mode of damage progression analyzed in this paper. The extensive debonding reduces the load borne by the broken fiber causing new fiber breaks and connecting the multiple fiber breaks, finally leading to catastrophic rupture of the UD composite. Hence, understanding of the debond growth process in fatigue is crucial for fatigue life analysis in this load region.

Place, publisher, year, edition, pages
Lancaster: PA Destech Publications Inc. , 2013. 981-983 p.
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-34243Local ID: 860dcb85-cffa-4e3d-8ec8-5781635c0ff6ISBN: 978-1-60595-113-3OAI: oai:DiVA.org:ltu-34243DiVA: diva2:1007493
Conference
International Conference on Composite Science and Technology : 24/04/2013 - 26/04/2013
Note
Godkänd; 2013; 20150310 (andbra)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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