Langues

Research laboratory

UMR 6602 - UCA/CNRS/SIGMA

Materials and Multi-Scales Modelling

 

  • Modelling of multi-physical active devices
  • Piezoelectric composite structures

 

Head of action: Yuri LAPUSTA This email address is being protected from spambots. You need JavaScript enabled to view it.

 

 

MULTI-PHYSICAL ACTIVE MATERIALS - A COUPLED MODEL FOR A HYDROGEL DIFFRACTION GRATING USED IN pH-SENSING


A diffractometric biochemical sensor, composed of a hydrogel grating fixed on a hard substrate that can swell due to pH changes, was modelled. We determined the photonic properties of the system and analyzed the diffraction intensities for different hydrogel grating deformations. Finally, we showed how the reflected beam measurement was related to the measured pH value using the developed model of the mechanical and photonic response of the smart hydrogel grating.

 

             
The hydrogel diffraction grating used for pH-sensing. Each hydrogel stripe swells with increasing pH and changes the optical response of the   Plot of intensity measurements for different values of incident angle.ith increasing pH and changes the optica

 

Contact:     Yuri LAPUSTA    This email address is being protected from spambots. You need JavaScript enabled to view it.
        
PhD: M. Marchant

Contract: LabEx IMobS3

Selected papers:
•    Modeling of a hydrogel diffraction grating used fo pH-sensing, M. Marchant et al., Comptes Rendus Mécanique 342(12), 706 (2014).

 


MODELING OF ACTIVE PIEZOELECTRIC COMPOSITE STRUCTURES WITH CRACKS


A smart system composed of an aluminum beam with two macro-fiber composites (MFC) patches aimed at detecting and suppressing undesired vibrations was analyzed. The influence of defects like cracks was considered. A crack was introduced between MFC and the aluminum beam, and the influence of this crack on the amplitude of beam was studied. A model for a crack in a fixed part of the beam was developed.

                                  
MFC structure consisting of electrodes, piezoelectric fibers and epoxy. Schematic of aluminium beam controlled by MFC patches with a crack.   Amplitude difference for a system with and without interface crack.

 

Contact:         Yuri LAPUSTA                 This email address is being protected from spambots. You need JavaScript enabled to view it.
        
PhD: O. Viun

Contract: LabEx IMobS3

Selected papers:
•    Modeling of active piezoelectric composite structures with cracks, O. Viun et al., Research in Mechanics of Composites, Paderborn, Germany (2013).