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In this article, we investigated and studied the effect of carbon Nanotubes fibers on the improvement of the mechanical and thermal properties of our epoxy matrix composite material. Our calculations were based on a heuristic optimization algorithm. The results show that the level of the damage is related to the concentration of the mechanical and thermal stresses, for the three materials studied carbon/epoxy, Graphite-epoxy and carbon nanotubes/epoxy, the calculations also show that carbon nanotubes have greatly improved the mechanical and physical properties of our material, and that this material is more resistant than the other carbon/epoxy composite materials and graphite-epoxy nanocomposite. The numerical simulation shows a good agreement with the real behavior of the three materials studied. This means that the mechanical and physical properties have been greatly improved after the use of carbon nanotubes fibers. Finally, we can say that our model has worked well in relation to the phenomenon of damage of composites and nanocomposites materials. It would be interesting to see, thereafter, the effect of carbon nanotubes fibers on the damage of the fiber-matrix interface of a bio-nanocomposite. [ABSTRACT FROM AUTHOR]

The objective of this paper is to study the effect of dissipated energy on the damage to the fiber-matrix interface of a Hemp/Pla bio-composite, localized by the non-linear acoustic technique. For this purpose, we used the model defining energy dissipation during a charge/discharge cycle in our numerical simulation based on the Weibull probabilistic model and Cox model. We found that the energy dissipated is directly related to the damage; and when the damage increases the dissipated energy increases rapidly in the first cycles (1, 2,3 and 4) and very quickly for the last charge/discharge cycles (5,6 and 7). We concluded that the energy dissipated showed the state of degradation of Biocomposite prior to its start-up, and that the non-linear acoustic technique also indicates and confirms the same results found. [ABSTRACT FROM AUTHOR]

The natural fibers are indeed a renewable resource, biodegradable and naturally with technical qualities and very high mechanical properties. The mechanical properties of reinforcement biocomposites as alfa / polylactic acid (PLA) are largely conditioned by the interfacial bond between the two materials (fiber and matrix). To characterize this link and locate damage to the fiber-matrix interface, we used a genetic approach based on the Cox model and formalism of Weibull. This model taking into account the micro-mechanical behavior of the three composite and biocomposites materials: Glass/epoxy, alfa / epoxy and alfa / PLA. The results of this simulation show that the damage level of the interface is related to the nature of the materials used and the applied mechanical stress, and has shown that the green material alfa / PLA is stronger than the biomaterial alfa / epoxy. The results of this modeling are in agreement with those obtained experimentally by Antoine et al. So the natural fibers have a very important role in enhancing the mechanical strength of composite and biocomposites materials. [ABSTRACT FROM AUTHOR]

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The objective of this work is to optimize the distance between fibers to reduce damage to the fiber matrix interface of a composite material. The results obtained by the genetic algorithm based on the volume fraction of reinforcement show a good agreement between numerical simulation and the actual behavior of both materials T300/914 and Peek/APC2, however, it would be interesting to see the effect of thermal stress on the optimization of the distance between fibers. [ABSTRACT FROM AUTHOR]

The objective of this work is to develop an analytical model to evaluate the influence of thermal stress on the damage of the fiber-matrix interface composite material T300/914; from the properties of the fiber, matrix and interfacial bonding characteristics. The model takes into account the effects of temperature that result in the gradual deterioration of the fiber-matrix interface. This study developed a genetic algorithm has shown the influence of heat stress beyond a critical threshold of damage to the interface, and also showed that the gradual deterioration of the matrix has a greater influence on the damage of the interface compared to that of the fiber. [ABSTRACT FROM AUTHOR]