Electromechanical-Mode Coupling Model and Failure Prediction of CFRP under Three-Point Bending

Carbon fiber reinforced polymer materials (CFRP) cause CFRP to bend or fail when subjected external loads impacts. In the case of static three-point bending, using conductive properties carbon inside CFRP, overall damage detection and failure prediction can be carried out by electromagnetic methods. The eddy current coil is used realize real-time monitoring damage, measured voltage value mapped obtain load sample. This paper conducts theoretical analysis experimental verification, obtains relationship between stress spatial conductivity change, proposes a electromechanical coupling model under quasistatic bending. Combined with theory electrically ineffective length, bending was revised. Experimental results prove that revised describe load-conductivity change trend three-dimensional braided more accurately, which provides basis for structural health through