基于压电阻抗方法的钢管裂纹损伤识别试验

发布时间：2018-04-05 08:40

本文选题：压电陶瓷　切入点：阻抗谱　出处：《武汉大学学报(工学版)》2014年02期

【摘要】：为了解利用压电阻抗方法识别钢管裂纹损伤的可行性,设计和制作钢管试验构件,通过机械加工方法模拟钢管裂纹产生和发展过程.利用压电阻抗方法对钢管裂纹损伤进行识别实验,实测各种损伤深度时压电陶瓷的PZT阻抗谱曲线,根据实验数据提取均方根差和协方差2个统计特征指标,分析裂纹损伤程度与统计特征指标之间的规律.试验结果表明,随着裂纹损伤程度加剧,PZT导纳频谱曲线明显向左偏移,峰值频率下降;阻抗谱曲线在高频段变化更明显,频率越高对初始损伤越敏感;均方根差和协方差等统计特征指标能有效判断钢管裂纹损伤状况.
[Abstract]:In order to understand the feasibility of using piezoelectric impedance method to identify the crack damage of steel tube, the experimental members of steel tube were designed and made. The process of crack generation and development of steel tube was simulated by mechanical processing method.The piezoelectric impedance method is used to identify the crack damage of steel pipe. The PZT impedance spectra of piezoelectric ceramics are measured at various damage depths. The root mean square difference (RMS) and covariance are extracted according to the experimental data.The law between crack damage degree and statistical characteristic index is analyzed.The experimental results show that the PZT admittance spectrum curve shifts obviously to the left and the peak frequency decreases as the crack damage intensifies, the impedance spectrum curve changes more obviously in the high frequency band, and the higher the frequency is, the more sensitive the PZT admittance spectrum is to the initial damage.The statistical characteristic indexes such as root mean square difference (RMS) and covariance can effectively judge the crack damage of steel pipe.
【作者单位】：长江大学城市建设学院;长江大学国际学院;
【基金】：国家自然科学基金项目(编号:51378077) 中国石油科技创新基金(编号:2011D-5006-0605) 湖北省教育厅科技计划重点项目(编号:D20131205)
【分类号】：U178

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