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Analysis of the nonlinear behavior of bio-based polymers reinforced with flax fibers

Damage. Visco-elastic. Visco- plastic. L. Rozite and R. Joffe Luleå University of Technology, S-97187 Luleå, SWEDEN. www.ltu.se roberts.joffe@ltu.se.

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Analysis of the nonlinear behavior of bio-based polymers reinforced with flax fibers

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  1. Damage Visco-elastic Visco-plastic L. Rozite and R. JoffeLuleå University of Technology, S-97187 Luleå, SWEDEN www.ltu.seroberts.joffe@ltu.se The Objective ofthis study was to analyze nonlinear behavior of flax fiber bio-based polymers composites. Influence of moisture also has been analyzed. Materials Analysis of the nonlinear behavior of bio-based polymers reinforced with flax fibers Scanning electron microscope images for PLA-NF10 (left), Lignin/FL30 (middle) and for comparison viscose fiber composite PLA-VF5 (right) Mechanical behavior Material model Damage Visco-plasticity Simulation Visco-elasticity SummaryMaterial model was developed assuming that possible sources of the observed behavior may be microdamage related stiffness reduction, nonlinear viscoelasticity as well as viscoplasticity. The model was rewritten in an incremental form where stress is a function of strain to simulate strain controlled tests. The simulated stress-strain curves in tensile test showed satisfying agreement with experimental data. Increase of moisture level in material decreases mechanical properties of composite. AcknowledgmentFinancial support by EU sixth framework programme project “New class of engineering composite materials from renewable resources”, BIOCOMP. Specimens were supplied by Tecnaro (Germany). 17th International Conference on Mechanics of Composite Materials, May 8 – June 1, 2012, Riga, Latvia

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