Composite models for compression moulded long regenerated cellulose fibre-reinforced brittle polylactide (PLA). (8th September 2017)

• Record Type: Journal Article
• Authors: Graupner, Nina; Ziegmann, Gerhard; Müssig, Jörg
• Is Part Of: Composites science and technology. Volume 149(2017)
• Page Start: 55
• Page End: 63
• Publication Date: 2017-09-08
• Subjects: Polymer-matrix composites (PMCs) -- Fibres -- Porosity/voids -- Strength -- Cellulose fibre-reinforced composite; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2017.05.028
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: The present study shows a new approach for the prediction of tensile strength values of compression moulded long cellulose fibre-reinforced brittle polylactide (PLA) composites. For this approach regenerated cellulose fibres (lyocell) of variable fineness were used as reinforcement. Composites with different fibre loadings (17, 26 and 36 vol-%) and mean fibre orientation angles ranging between ± 20 and ± 65° were manufactured. Some published models were applied to the mechanical properties of our composites. While the rule of mixture as well as the Kelly-Tyson model lead to a clear overestimation of the strength values, the model of Taha & El-Sabbagh et al. (developed for injection moulded composites) leads to a clear underestimation. On the basis of the Kelly-Tyson-model expanded with Taha & El-Sabbagh et al.'s agglomeration factor and the use of the fibre stress at the point of elongation at break of the composite a new model was created for compression moulded regenerated cellulose fibre-reinforced composites. Overall, 19 different composites were investigated. 13 of them show a deviation from the model data to the measured tensile strength of < ± 10%, 4 of them between - 10% and −15% and only 2 of them have shown a deviation of −16 and −18%, respectively.