不同测量模式的电阻层析成像方法及其冲击损伤检测

Low-speed impacts on composite materials frequently result in imperceptible surface damage, compromising service safety. Therefore, it is significant to develop online and in-situ material damage detection methods for real-time health monitoring and management. Based on the characteristic that damage will cause changes in the resistance of composite plates, an electrical resistance tomography for damage is established, the influence of different measurement modes on the imaging effect is studied, and the application and verification of the method in composite impact damage is carried out. Four measurement methods are proposed: adjacent excitation and relative excitation, adjacent measurement and relative measurement. The optimal measurement mode is studied and optimized through numerical experiments, and it is further analyzed for the damage detection ability of various composite plates. The results show that the combination mode of adjacent excitation and relative measurement has the best imaging effect. The mode can accurately locate the impact damage of composite plates under different impact levels and positions, and the average positioning error does not exceed 6.72%. The establisded electrical resistance tomography has the advantages of high image contrast and clear defect positioning, and can be promoted for damage detection of composite laminated panels.