Nondestructive evaluation of ±45° flat-braided carbon-fiber-reinforced polymers with carbon nanofibers using HTS-SQUID gradiometer

► Tensile load was applied to braided CFRPs with and without CNFs and cutting edges. ► Visualization method using SQUID gradiometer was also applied to the braided CFRPs. ► Different destructive mechanisms and current distributions were obtained. ► Dispersed CNFs enhanced mechanical and electrical properties of the braided CFRPs.