6533b860fe1ef96bd12c3970
RESEARCH PRODUCT
Mechanical properties of natural fiber composites produced using dynamic sheet former
Janis VarnaLiva PupureRoberts JoffeFredrik BertholdArttu Miettinensubject
0106 biological sciencesMaterials scienceflaxselluloosaHot pressing01 natural sciencesstiffnesschemistry.chemical_compoundMatrix (mathematics)joustavuusPolylactic acid010608 biotechnologyNaturvetenskapjäykkyysmedicineplaGeneral Materials ScienceviscoplasticityComposite materialdynamic sheet formerkomposiititNatural fiber040101 forestrywood fiber compositeskuiduttechnology industry and agricultureStiffness04 agricultural and veterinary sciencesnonlinear behaviorCellulose fiberchemistryPLA0401 agriculture forestry and fisheriestencel fibersmedicine.symptomNatural Sciencesstrengthlujuusdescription
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. peerReviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-06-04 |