Real-time monitoring of electro-mechanical effect in carbon-fiber reinforced polymer using HTS SQUID

Stress damage of cross-ply or quasi-isotropic carbon-fiber reinforced polymer laminates, commonly used in aerospace structures, has been monitored in real-time during quasi-static loading. The fiber displacement in the matrix due to mechanical loading have been detected using atomic force microscopy techniques. A correlation between mechanical and electrical effects in the material has been confirmed by electrical and magnetic measurement using an eddy current technique based on high critical temperature dc Superconducting Quantum Interference Device magnetometer.