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Study Of A Coupled Mechanical-Hygrothermal Degradation Of Bio-Based Composites

Abstract : This work deals with the characterization under environmental conditions of the behavior of polylactic acid/flax composites. In order to simulate real-life aging conditions, the influence of three different kinds of damage (hydric, thermal and mechanical) was assessed. Materials were immersed in water and they were characterized thanks to different techniques such as weight and dimension measurements as well as analysis of the natural mode of vibration. Results show the strong influence of both temperature and fiber content in the polymer regarding water absorption and evolution of mechanical properties. Water uptake induces swelling and plasticization of the composite which results in a decrease of the dynamic elastic modulus and an increase of the damping factor. Irreversible damage of the materials may occur for long aging times and lead to an increase of dynamic elastic modulus. The long-term behavior of these materials was evaluated by creep tests. They show a decrease of the elastic modulus even without a degrading environment. Nevertheless, in conditions suitable for aging, the modulus drops drastically.
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Submitted on : Tuesday, May 25, 2021 - 9:48:56 AM
Last modification on : Wednesday, October 20, 2021 - 1:23:05 AM
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  • HAL Id : hal-03233776, version 1



Arnaud Regazzi, Stéphane Corn, Patrick Ienny, Anne Bergeret, Jean-Charles Benezet. Study Of A Coupled Mechanical-Hygrothermal Degradation Of Bio-Based Composites. DURACOSYS 2012, Sep 2012, Bruxelles, Belgium. ⟨hal-03233776⟩



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