Background: In this paper, we have studied the improvement of the physical and
chemical properties of the fiber-matrix interface of a Biocomposite based on the copolymer
polylactic acid (PLA).
Methodology: We have developed an analytical model using a genetic approach to locate
the interface damage under the effect of mechanical stress, temperature and humidity. Our
simulation is based on Weibull's probabilistic approach and the law of water diffusion in
polymer matrix, the diffusion is generated by Fick's law.
Results: Our results show that the interface of Biocomposite (Starch-PLA) is the most resistant
to the different constraints applied and that the physical and chemical properties of this
material are much more improved compared to other materials studied by the same genetic
Conclusion: Our calculations coincide perfectly with the conclusions of Antoine et al. who
determined that natural fibers improve the physical properties of composite materials.