Effect of single-fiber properties and fiber volume fraction on the mechanical properties of Ioncell fiber composites. (October 2021)

• Record Type: Journal Article
• Authors: Karakoc, Alp; Bulota, Mindaugas; Hummel, Michael; Sriubaitė, Simona; Hughes, Mark; Sixta, Herbert; Paltakari, Jouni
• Is Part Of: Journal of reinforced plastics and composites. Volume 40:Number 19/20(2021)
• Page Start: 741
• Page End: 748
• Publication Date: 2021-10
• Subjects: Composites -- Ioncell -- regenerated cellulose fiber -- fiber volume fraction -- draw ratio -- embedded element method; Reinforced plastics -- Periodicals; Composite materials -- Periodicals; 620.1923
• DOI: 10.1177/07316844211005393
• Languages: English
• ISSNs: 0731-6844

Abstract

The present study concentrates on a series of experiments and numerical analyses for understanding the effects of fiber volume fraction ( VF ) and draw ratio ( DR ) on the effective elastic properties of unidirectional composites made from an epoxy resin matrix with a continuous fiber reinforcement. Lyocell-type regenerated cellulose filaments (Ioncell) spun with DR s of 3, 6, and 9 were used. In accordance with the specimens in situ, the fibers were modeled as slender solid elements, for which the ratio between the diameter and length was taken to be much less than unity and deposited inside the matrix with the random sequential adsorption algorithm. The embedded element method was thereafter used in the numerical framework due to its computational advantages and reasonable predictions for continuous fiber reinforced composites. Experiments and numerical investigations were carried out, the results of which were compared, and positive trends for both fiber VF s and DR s on the effective properties were observed. The presented experimental and numerical results and models herein are believed to advance the state of the art in the mechanical characterization of composites with continuous fiber reinforcement.