Modelling of the Nano-Reinforcement of Thermosetting Polymers Using CNTs. Feifei Zhao 1 , M. DRISSI-HABTI 1 *. 1 PRES LUNAM, IFSTTAR, Département Mesure, Auscultation et Calcul Scientifique (MACS) 44344 Bouguenais Cedex, France For correspondence : * [email protected]
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Modelling of the Nano-Reinforcement of Thermosetting Polymers Using CNTs
Feifei Zhao1, M. DRISSI-HABTI1*
1 PRES LUNAM, IFSTTAR, Département Mesure, Auscultation et Calcul Scientifique (MACS)
44344 Bouguenais Cedex, France
For correspondence : * [email protected]
Background: The project aims to model the influence of the orientation angle of the CNTs inside thermosetting polymers regarding the applied stress, during the reinforcement process. The compressive stress, σ, is imposed at the top of the domain while the CNT disperses inside the domain with an orientation angle α. To do that, instead of analyzing the whole domain of the material, a unit nano-cell of the domain was selected to be simulated
Problématique : The high van der Waals (vdW) force between the CNTs and the surrounding polymers cannot be ignored
Odegard et al. developed the Effective Interface Model (EIF) to consider the high vdW force of the reinforcement process.
The assumed interface between the CNT and the surrounding polymer is actually the layer of space between them
The influence of the orientation angle was simulated from two aspects:
1, The elastic Young’s Modulus of the final
composite was calculated using
2,The stress-strain curve of the final
composite with the propagation of the
deformation or stress
The volume fraction is 1% which is the most widely used.
1st step : Simulation of the stiffness
To satisfy the Hill condition (1), two kinds of boundary conditions were used for the simulation:
1, Uniform displacement (Dirichlet, Kinematic, KUBC) boundary condition
2, Periodic boundary condition (PBC):
2nd step : Simulation of the Stress-Strain curve
Some conclusions :
As the polymer is always viscoelasticity, the stress-strain curve can be used to measure the damage with the propagation of the stress applied on the top of the domain.
Ce travail a été conduit dans le cadre du projet FUI (fonds uniques interministériels de la DGE), Decid2. MDH tient à remercier ces fonds, ainsi que la Région Pays de la Loire pour le soutien financier.