碳纤维复合材料层合板损伤的压电阻抗法检测研究
Study on Damage Detection of Carbon Fiber Composite Laminates via Electro-Mechanical Impedance Method

为了验证压电阻抗（Electro-Mechanical impedance，EMI）技术在复合材料结构无损检测中的适用性，搭建损伤检测实验平台，设置不同的工况，测量不同损伤状态下PZT的电导曲线。利用均方根偏差RMSD对电导曲线进行分析，得出了损伤程度、损伤位置与RMSD值之间的关系：损伤程度增大，PZT测得电导曲线的偏移量增大，体现为RMSD值增大；与损伤位置间距越小的PZT测得电导曲线的RMSD值越大。验证了压电阻抗法应用于复合材料结构的适用性，并利用损伤距离与RMSD值之间的关系进行初步定位实验，得到精度较高的定位拟合曲线。
In order to verify the applicability of Electro-Mechanical impedance (EMI) technology in the nondestructive testing of composite structures, a damage detection experimental platform was set up, and different conductance conditions were set up to measure the conductance curves of PZT with different damage states. Through the analysis of the conductance curve based on the RMSD, the relationship between the damage degree and the location of damage and the RMSD value is obtained. The greater the damage degree is, the greater the RMSD value of the conductance curve which is measured by PZT and the larger the distance from the damage location to PZT is, and the larger the RMSD value of the conductance curve is. The validity of the application of EMI to carbon fiber reinforced polymer(CFRP) is verified. With the relationship between the damage distance and the RMSD value, a preliminary positioning experiment is carried out and obtains a high precision location fitting curve