Electrical Resistivity Tomography for Damage Assessment in GFRP Laminates with Conductive Nanoparticles

摘要

Damage assessment methods in composite structures based on various sensing networks have been developed in recent years. In this study, an electrical resistivity tomography method was successfully developed to locate and quantitatively assess growth of transverse impact damage in GF/EP composite laminates, aided with a damage index for individual pathways of conductive network in GF/EP quasiisotropic laminates with an epoxy matrix modified by carbon black (CB) nanoparticles of 2.0 wt% and copper chloride (CC). The addition of CB nanoparticles and CC substantially improves electrical conductivity of GF/EP composites in all three principal directions with percolation network of CB nanoparticles. The addition of CB nanoparticles also clearly increases both initiation and propagation values of modes I and Ⅱ interlaminar fracture toughness of GF/EP composite laminates.