A1 Journal article (refereed)
Mechanical properties of natural fiber composites produced using dynamic sheet former (2020)

Pupure, L., Varna, J., Joffe, R., Berthold, F., & Miettinen, A. (2020). Mechanical properties of natural fiber composites produced using dynamic sheet former. Wood Material Science and Engineering, 15(2), 76-86. https://doi.org/10.1080/17480272.2018.1482368

JYU authors or editors

Publication details

All authors or editors: Pupure, Liva; Varna, Janis; Joffe, Roberts; Berthold, Fredrik; Miettinen, Arttu

Journal or series: Wood Material Science and Engineering

ISSN: 1748-0272

eISSN: 1748-0280

Publication year: 2020

Volume: 15

Issue number: 2

Pages range: 76-86

Publisher: Taylor and Francis

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1080/17480272.2018.1482368

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/68289

Abstract

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.

Keywords: stiffness; fibres; composites; cellulose; strength of materials; resiliency (flexibility)

Free keywords: wood fiber composites; tencel fibers; dynamic sheet former; strength

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1