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Micromechanical Viscoelastic Analysis of Flax Fiber Reinforced Bio-Based Polyurethane Composites

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In this study, a novel, bio-based polyol was used in the formulation of a polyurethane (PU) matrix for a composite material where flax fiber was used as the reinforcement. The viscoelastic properties of the matrix and flax fiber were determined by a linear viscoelastic model through experimentation and the results were used as input for the material properties in the computational model. A finite element micromechanical model of a representative volume element (RVE) in terms of repeating unit cells (RUC) was developed to predict the mechanical properties of composites. Six loading conditions were applied on the RUC to predict and define the viscoelastic behavior of the composite unit cell. The time-history of averaged response was determined in terms of stress and strains. The results of this study suggest that applying the overall rate-dependent behavior of flax fiber to the micromechanical model leads to a good agreement between the micromechanical modeling and experimental results. The modeling approach is efficient and accurate as long as the periodicity in the composite rules. This modeling approach can be used as a powerful algorithm in determining linear and nonlinear properties in material mechanics analysis and characterization.
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Document Type: Research Article

Publication date: 01 August 2015

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  • The Journal of Renewable Materials (JRM) publishes high quality peer reviewed original research on macromolecules and additives obtained from renewable/biobased resources. Utilizing a multidisciplinary approach, JRM introduces cutting-edge research on biobased monomers, polymers, additives (both organic and inorganic), their blends and composites. It showcases both fundamental aspects and new applications for renewable materials. The fundamental theories and topics pertain to chemistry of biobased monomers, macromoners and polymers, their structure-property relationship, processing using sustainable methods, characterization (spectroscopic, morphological, thermal, mechanical, and rheological), bio and environmental degradation, and life cycle analysis. Demonstration of use of renewable materials and composites in applications including adhesives, bio and environmentally degradable structures, biomedicine, construction, electrical & electronics, mechanical, mendable and self-healing systems, optics, packaging, recycling, shape-memory, and stimulus responsive systems will be presented.
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