Application of Fiber Undulation Model to Predict Oriented Strand Composite Elastic Properties
The effects of strand undulation angles in wood-strand composites have often been ignored due to the virtual impossibility of experimental determination of their effects on composite material properties, and the difficulty in modeling localized deviations in angle along the path of a strand. The fiber undulation model (FUM), that has been previously verified, was applied in this study to predict the elastic constants of laboratory-manufactured oriented strand panels. A stochastic approach was incorporated where a series rule of mixtures with probability density functions of angle distributions was utilized in the model to transform the elastic constants in the constitutive matrix of the material for in- and out-of-plane strand deviations. Based on a theoretical approach, a reduction in Ex due to strand undulations averaged about 7 percent over all configurations of test panels, indicating that localized out-of-plane strand deviations in commercially manufactured wood-strand composites should not significantly affect longitudinal Young's modulus.
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Document Type: Research Article
Publication date: 2015-08-01
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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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