Camille Bessaguet has defended her thesis on organic matrix composites

On wednesday, October 4th 2017, Camille Bessaguet has defended her thesis. Awarded by University of Toulouse III – Paul Sabatier, her work was supervised by both CIRIMAT laboratory (CNRS/INPT/UT3 Paul Sabatier), Clément Ader Institute (CNRS/IMT Mines Albi-Carmaux/INSA/ISAE-SUPAERO/UT3 Paul Sabatier) and IRT Saint Exupéry.
The high quality and the relevance of Camille’s thesis contributed to get significant results as a part of COMPINNOVTP project.


« PEKK polymer matrix / sodium niobate / graphene or carbon black hybrid composite, for a passive vibration damping by local transduction-dissipation, for aeronautic and space applications »

About this thesis

The aim of this work was to increase the damping in a high performance thermoplastic composite with the poly(ether ketone ketone) (PEKK) as polymer matrix. The passive vibration damping concept based on piezoelectric particles (sodium niobate, NaNbO3) and conductive particles (graphene and carbon black) was studied. Piezoelectric particles ensure the mechanic-electric transduction of the vibration. Conductive particles dissipate by Joule effect the electric charges generated by the piezoelectric particles within the polymer matrix. Presence of these two kinds of particles improves the dissipation of the mechanical energy by the local transduction-dissipation phenomena. This damping film was visco-constrained between composites plies. The different contributions of energy dissipation have been identified: the polymer viscoelasticity, the stick-slip at the particle/matrix interface, the shear induced by carbon fibers and the local transduction-dissipation. The latter phenomena has been demonstrated significantly through the study of mechanical behavior and dynamic response of the laminate composites. After the polarization step, the area under the dissipative shear modulus G’’ of the mechanical relaxation mode α is increased by 18%, the hysteresis loop area from 16% to 34% and resonance mode amplitudes are decreased, up to 54% for the 2nd mode.


Elaboration of multifunctional thermoplastics materials for aeronautic and space.


  • Dr. E. DANTRAS, Cirimat – CNRS – PhD Advisor
  • Pr. G. MICHON – Toulouse University – PhD Advisor
  • Pr. L. LEBRUN – INSA Lyon – Rapporteur
  • Dr. B. DEFOORT – Ariane Group – Rapporteur
  • Pr. G. CHEVALLIER – Besançon University  – Examiner
  • Pr. J. MARTINEZ-VEGA – Toulouse University – Examiner
  • Dr. M.CHEVALIER – IRT Saint-Exupéry/Airbus  – Invited

C. Bessaguet, E. Dantras, C. Lacabanne, M. Chevalier, G. Michon:“Piezoelectric and mechanical behavior of NaNbO3/PEKK lead-free nanocomposites”. Journal of Non-Crystalline Solids, Elsevier, 2017, 459, pp.83-87

Abstract : Lead-free piezoelectric nanocomposites based on poly(ether ketone ketone) (PEKK) and sodium niobate (NaNbO3) particles were elaborated. The presence of submicronic particles does not influence the thermal stability of the matrix so that no degradation phenomenon is observed before 500 °C. The conservative mechanical modulus G′ increases linearly with the NaNbO3 fraction; this variation is well fitted by the Kerner model until 20 vol%. Such nanocomposites remain ductile. The polarizing field required for obtaining piezoelectric nanocomposites is 12 kV·mm−1 i.e. analogous with the one used for poling bulk ceramic. The value of the piezoelectric coefficient (d33 = 0.2 pC·N−-1 for 20 vol% NaNbO3) is consistent with the Furukawa’s model. This value is explained by the low PEKK permittivity. This low d33 is counterbalanced by the piezoelectric voltage constant (g33 = 103·10−3 Vm·N−1) which is higher than the one of classical piezoelectric ceramic like PZT or BaTiO3.

C. Bessaguet, E. Dantras, G. Michon, M. Chevalier and C. Lacabanne (2017): “Passive vibration damping nanocomposite for high performance applications”. EPF 2017 (European Polymer Federation Congress), Lyon (France). July 2 – 7th, 2017

C. Bessaguet, E. Dantras, G. Michon, M. Chevalier and C. Lacabanne (2017): “Passive vibration damping of high performance thermoplastic composite filled with piezoelectric particles”. Journée des doctorants du CNES, Toulouse (France). June 27, 2017

C. Bessaguet, E. Dantras, C. Lacabanne, G. Michon and M. Chevalier: “PAEK / Piezoelectric Particles Nanocomposites for Interactive Structures”. IC3 2016 (International Carbon Composites Conference), Arcachon (France). 2016

C. Bessaguet, E. Dantras, D. Carponcin and G. Michon: “Piezoelectric and mechanical properties of a high performance thermoplastic composite”. JIP-JEPO 2015, Donostia-San Sebastian (Spain). 2015

Camille Bessaguet has defended her thesis on organic matrix composites
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