Mechanical properties of natural fiber composites produced using dynamic sheet former |
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| Authors: | Liva Pupure Janis Varna Roberts Joffe Fredrik Berthold Arttu Miettinen |
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| Institution: | 1. Division of Materials Science, Lule? University of Technology, Lule?, Swedenliva.pupure@ltu.se;3. Division of Materials Science, Lule? University of Technology, Lule?, Sweden;4. Swerea SICOMP, Pite?, Sweden;5. Rise Bioeconomy/Innventia AB, Stockholm, Sweden;6. Department of Physics, University of Jyv?skyl?, Jyv?skyl?, Finland;7. Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland;8. Centre d'Imagerie BioMédicale, école Polytechnique Fédérale de Lausanne, Lausanne, Switzerland |
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| Abstract: | ABSTRACTComposites formed from wood fibers and man-made cellulosic fibers in PLA (polylactic acid) matrix, manufactured using sheet forming technique and hot pressing, are studied. The composites have very low density (due to high porosity) and rather good elastic modulus and tensile strength. As expected, these properties for the four types of wood fiber composites studied here improve with increasing weight fraction of fibers, even if porosity is also increasing. On the contrary, for man-made cellulosic fiber composites with circular fiber cross-section, the increasing fiber weight fraction (accompanied by increasing void content) has detrimental effect on stiffness and strength. The differences in behavior are discussed attributing them to fiber/ fiber interaction in wood fiber composites which does not happen in man-made fiber composites, and by rather weak fiber/matrix interface for man-made fibers leading to macro-crack formation in large porosity regions. |
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| Keywords: | Wood fiber composites PLA Tencel fibers dynamic sheet former stiffness strength |
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