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Mechanical damage characteristics of elementary hemp fibers and scale effect of fiber strength
Institute of Polymer Mechanics, University of Latvia.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0002-5210-4341
2012 (engelsk)Inngår i: High Performance Structure and Materials VI: papers presented at the 6th International Conference on High Performance Structures and Materials held at the Wessex Institute of Technology in the New Forest, UK] / [ed] W.P. De Wilde; C.A. Brebbia; S. Hernandez, Southampton: WIT Press, 2012, s. 157-167Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Ecological and economical considerations foster replacement of man-made fibers by natural renewable fibers in various industrial applications. Bast fibers of such plants as, e.g., flax, hemp, jute etc., are particularly attractive as a reinforcement of polymer-matrix composites due to their high specific stiffness and strength in the axial direction. The elementary bast fibers exhibit pronounced scatter of strength. It necessitates probabilistic description of their strength via a distribution function that reflects damage morphology and severity in fibers. Fiber fracture is shown to originate from mechanical defects of the bast cell wall, the most prominent of them being kink bands. While the number of kink bands in a fiber is easily determined by optical microscopy, direct experimental measurement of their strength is complicated. Therefore, alternative approaches are sought, enabling extraction of strength characteristics of the kink bands from fiber tests via appropriate probabilistic models. Analytical distribution function of bast fiber strength has been derived, allowing for the effect of mechanical damage in the form of kink bands. The fiber characteristics measured have been used to evaluate the kink band density and strength distributions. The theoretical distribution is verified against experimental tensile strength data of elementary hemp fibers at several gauge lengths and found to provide acceptable accuracy in predicting the scale effect of strength.

sted, utgiver, år, opplag, sider
Southampton: WIT Press, 2012. s. 157-167
Serie
W I T Transactions on the Built Environment, ISSN 1746-4498 ; 124
Emneord [en]
hemp, bast fibers, scale effect, Weibull distribution, Materials science - Construction materials
Emneord [sv]
Teknisk materialvetenskap - Konstruktionsmaterial
HSV kategori
Forskningsprogram
Polymera konstruktionsmaterial
Identifikatorer
URN: urn:nbn:se:ltu:diva-30596Scopus ID: 84865773667Lokal ID: 47430f10-8967-4618-bea4-f52b219453b2ISBN: 978-1-84564-596-0 (tryckt)OAI: oai:DiVA.org:ltu-30596DiVA, id: diva2:1003825
Konferanse
International Conference on High Performance Structures and Materials : 18/06/2012 - 20/06/2012
Merknad
Validerad; 2012; 20120623 (joffe)Tilgjengelig fra: 2016-09-30 Laget: 2016-09-30 Sist oppdatert: 2018-01-16bibliografisk kontrollert

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