Mechanical properties of natural fiber composites produced using dynamic sheet former
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
Published inWood Material Science and Engineering
© 2018 The Author(s)
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.
PublisherTaylor and Francis
Publication in research information system
MetadataShow full item record
Showing items with similar title or keywords.
Miettinen, Arttu (University of Jyväskylä, 2016)Analysis methods for X-ray microtomographic images of short fibre composite materials were developed. The methods enable estimation of microstructural properties of the material, e.g., aspect ratio and orientation of ...
Effective elastic properties of biocomposites using 3D computational homogenization and X-ray microcomputed tomography Karakoç, Alp; Miettinen, Arttu; Virkajarvi, Jussi; Joffe, Roberts (Elsevier BV, 2021)A 3D computational homogenization method based on X-ray microcomputed tomography (μCT) was proposed and implemented to investigate how the fiber weight fraction, orthotropy and orientation distribution affect the effective ...
A 10-Week Block of Combined High-Intensity Endurance and Strength Training Produced Similar Changes in Dynamic Strength, Body Composition, and Serum Hormones in Women and Men Taipale, Ritva S.; Forssell, Jaakko; Ihalainen, Johanna K.; Kyröläinen, Heikki; Häkkinen, Keijo (Frontiers Media, 2020)Purpose: To examine the potential sex differences in adaptations to combined endurance and strength training in recreationally endurance trained (eumenorrheic) women (n = 9) and men (n = 10). Methods: Isometric (ISOMmax) ...
Sippola, Merja; Immonen, Kirsi; Miettinen, Arttu; Laukkanen, Anssi; Andesson, Tom; Peltola, Heidi; Harlin, Ali; Holmberg, Kenneth (Sage Publications Ltd., 2016)This paper studies failure of birch pulp–polylactic acid composites. Stiffness and strength are calculated using the theory of short fibre composites and the results are compared to experimental data. The results differed ...
Use of micro-tomography for validation of method to identify interfacial shear strength from tensile tests of short regenerated cellulose fibre composites Hajlane, A.; Miettinen, Arttu; Madsen, B.; Beauson, J.; Joffe, R. (Institute of Physics Publishing Ltd., 2016)The interfacial shear strength of short regenerated cellulose fibre/polylactide composites was characterized by means of an industry-friendly adhesion test method. The interfacial shear strength was back-calculated from ...