Affiliations: [a] Conservatoire National des Arts et Métiers
(CNAM), 2 rue Conté, 75003 Paris, France | [b] Groupe de Physique et Mécanique des
Matériaux (GPM2), – ENSPG-CNRS – BP 38402 Saint Martin d'Heres,
France | [c] Groupe d'Etude de Métallurgie Physique et
Physique des Matériaux (GEMPPM), INSA-CNRS, 69621 Villeurbanne cedex,
France | [d] Centre de Recherche sur les Macromolécules
Végétales (CERMAV), CNRS, BP 38402 St Martin d'Heres
Abstract: This paper reports in situ measurements of electrical
resistivity during mechanical solicitation of insulator-conductor composite.
Electrical and mechanical behaviors will be discussed on 3 examples namely (i)
unidirectional carbon fiber reinforced polymers (CFRP), (ii) stick-like
whiskers reinforced soft thermoplastics and (iii) carbon nanotubes reinforced
soft thermoplastics. Resistivity measurements are described as a useful tool to monitor
the damage of these composites. In the case of composite materials consisting
in reinforced insulated matrix by electrically conducting fibers or fillers,
resistivity (or conductivity) measurements show classically several features
such as strong anisotropy in long fiber composites or the existence of
continuous direct current (DC) conducting pathway for short fiber or
particulate composites. Moreover, and this is the topic discussed here, in
terms of mechanical stress/strain properties, the fibers or fillers conducting
network may exhibit resistivity changes due to fiber ruptures, delamination,
filler-filler debonding within filler network, etc.
