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The mechanical behavior of polylactic acid (PLA) films: fabrication, experiments and modelling

Journal article
Authors S.M. Mirkhalaf
M. Fagerström
Published in Mechanics of Time-Dependent Materials
ISSN 1385-2000
Publication year 2019
Published at Department of Physics (GU)
Language en
Keywords Elasto-viscoplastic, Mechanical behavior, Polylactic acid (PLA), Thin films
Subject categories Solid mechanics, Applied Mechanics


© 2019, The Author(s). Polylactic acid (PLA) is one of the highly applicable bio-polymers in a wide variety of applications including medical fields and packaging. In order to quantitatively model the mechanical behavior of PLA and PLA based bio-composite materials, and also tailor new bio-composites, it is required to characterize the mechanical behavior of PLA. In this study, thin films of PLA are fabricated via hot-pressing, and tensile experiments are performed under different strain rates. To model the mechanical behavior, an elasto-viscoplastic constitutive model, developed in a finite strain setting, is adopted and calibrated. Using the physically-based constitutive model, all regimes of deformation under uniaxial stress state, including post-yield softening, were adequately captured in the simulations. Also, the rate dependency of the stress–strain behavior was properly modelled.

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