基于压电阻抗的碳纤维复合材料脱黏损伤研究

Study on debonding damage of carbon fiber composite based on electromechanical impedance

脱黏损伤是复合材料结构中最常见的损伤之一,其检测对于评估复合材料结构安全至关重要。本文基于压电阻抗技术(EMI),借助压电-结构耦合场分析,采用阻抗实部曲线的均方根(RMS)和峰值对应频率(fmax)作为区分碳纤维复合材料中脱黏和非脱黏区域的判别指标进行分析,使用均方根偏差(RMSD)、平均绝对偏差(MAPD)和相关系数偏差(CCD)对不同脱黏程度进行量化对比。研究结果表明:RMS和fmax可以很好地区分碳纤维复合材料中脱黏与非脱黏区域,RMSD和CCD可以较好地表征其脱黏程度。

Debonding damage is one of the most common damage in composite structures,which is not easily detected but poses a serious threat to structural safety,so its detection is very important to evaluate the safety of composite structures.In this paper,based on the electro-mechanical impedance technique(EMI),the root mean square(RMS)and the peak corresponding frequency(fmax)of the real part of the impedance curve are used as discriminators to distinguish the debonded and non-debonded regions in carbon fiber composites with the help of piezo-structural coupling field analysis.Next,the different degrees of debonding of carbon fiber composites were quantified and compared using the root mean square deviation(RMSD),mean absolute deviation(MAPD)and correlation coefficient deviation(CCD)of damage metrics.The results show that the discriminant indexes RMS and fmax can well distinguish the debonded and non-debonded regions in carbon fiber composites,and the damage indexes RMSD and CCD can better characterize the degree of debonding.