Mechanical Properties of Natural Fiber Composites Produced Using Dynamic Sheet Former
Wood Material Science and Engineering 2020
Līva Pupure, Jānis Vārna, Roberts Joffe, Frederik Berthold, Arttu Miettinen

Composites 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.

dynamic sheet former, PLA, stiffness, strength, Tencel fibers, Wood fiber composites

Pupure, L., Vārna, J., Joffe, R., Berthold, F., Miettinen, A. Mechanical Properties of Natural Fiber Composites Produced Using Dynamic Sheet Former. Wood Material Science and Engineering, 2020, Vol. 15, No. 2, pp.76-86. ISSN 1748-0272. e-ISSN 1748-0280. Available from: doi:10.1080/17480272.2018.1482368

Publication language
English (en)
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