Analysis of the nonlinear behavior of bio based polymers reinforced with flax fibers
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Damage. Visco-elastic. Visco- plastic. L. Rozite and R. Joffe Luleå University of Technology, S-97187 Luleå, SWEDEN. www.ltu.se [email protected]

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

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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. JoffeLuleå University of Technology, S-97187 Luleå, SWEDEN

[email protected]

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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