Electro-Mechanical Impedance Method for Crack Detection in Thin Plates

This paper describes the utilization of Electro-Mechanical (E/M) impedance method for structural health monitoring of thin plates. The method allows the direct identification of structural dynamics by obtaining its E/M impedance or admittance signatures. The analytical model for two-dimensional structure was developed and verified with experiments. Good matching of experimental results and calculated spectra was obtained for axial and flexural components. The ability of the method to identify the presence of damage was investigated by performing an experiment where the damage in the form of crack was simulated with an EDM slit placed at various distances from the sensor. It was found that the crack presence dramatically modifies the E/M impedance spectrum and this modification decreases as the distance between the sensor and the crack increases. Several overall-statistics damage metrics, which may be used for on-line structural heath monitoring, were investigated. Among these candidate damage metrics, the αth power of the correlation coefficient deviation, CCDα,3< α <7, used in the high frequency band 300-450 kHz, was found to be most successful. Careful selection of the high frequency band and proper choice of the appropriate damage metric were found to be essential for successful damage detection and structural health monitoring.

[1]  Stephen H. Crandall,et al.  Natural Modes and Natural Frequencies of Uniform, Circular, Free-Edge Plates , 1979 .

[2]  J. S. Rao.  Dynamics of Plates , 1998 .

[3]  Craig A. Rogers,et al.  Theoretical modeling of wave propagation and energy dissipation in joints , 1996 .

[4]  John R. Airey.  The Vibrations of Circular Plates and their Relation to Bessel Functions , 1910 .

[5]  Leonardo Lecce,et al.  Experimental and Numerical Activities on Damage Detection Using Magnetostrictive Actuators and Statistical Analysis , 2000 .

[6]  Thein Wah,et al.  Vibration of Circular Plates , 1962 .

[7]  Arthur W. Leissa,et al.  Vibration of Plates , 2021, Solid Acoustic Waves and Vibration.

[8]  Victor Giurgiutiu,et al.  Embedded Self-Sensing Piezoelectric Active Sensors for On-Line Structural Identification , 2002 .

[9]  Morio Onoe,et al.  Useful Formulas for Piezoelectric Ceramic Resonators and Their Application to Measurement of Parameters , 1966 .

[10]  Suresh Bhalla,et al.  Performance of smart piezoceramic patches in health monitoring of a RC bridge , 2000 .

[11]  Daniel J. Inman,et al.  Impedance-Based Structural Health Monitoring with Artificial Neural Networks , 2000 .

[12]  Victor Giurgiutiu,et al.  Characterization of Piezoelectric Wafer Active Sensors , 2000 .

[13]  W. Soedel.  Vibrations of shells and plates , 1981 .

[14]  A.S.J. Swamidas,et al.  Vibration of continuous circular plates , 1974 .

[15]  Craig A. Rogers,et al.  Automated real-time structure health monitoring via signature pattern recognition , 1995, Smart Structures.

[16]  Daniel J. Inman,et al.  Feasibility of using impedance‐based damage assessment for pipeline structures , 2001 .

[17]  Ieee Standards Board.  IEEE Standard on Piezoelectricity , 1996 .

[18]  K. Tseng,et al.  Non-parametric damage detection and characterization using smart piezoceramic material , 2002 .

[19]  Daniel J. Inman,et al.  IMPEDANCE-BASED HEALTH MONITORING OF CIVIL STRUCTURAL COMPONENTS , 2000 .

[20]  Craig A. Rogers,et al.  High-frequency impedance analysis for NDE of complex precision parts , 1996, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[21]  Daniel J. Inman,et al.  An Integrated Health Monitoring Technique Using Structural Impedance Sensors , 2000 .

[22]  R. C. Colwell.  The Vacuum Tube Oscillator for Membranes and Plates , 1936 .

[23]  Victor Giurgiutiu,et al.  Damage Detection in Simulated Aging-Aircraft Panels Using the Electro-Mechanical Impedance Technique , 2000, Adaptive Structures and Material Systems.

[24]  Craig A. Rogers,et al.  Local-area health monitoring of aircraft via piezoelectric actuator/sensor patches , 1995, Smart Structures.

[25]  Victor Giurgiutiu,et al.  EMBEDDED ACTIVE SENSORS FOR IN-SITU STRUCTURAL HEALTH MONITORING OF AGING AIRCRAFT STRUCTURES , 2001 .

[26]  Victor Giurgiutiu,et al.  The electro‐mechanical impedance method for damage identification in circular plates , 2001 .

[27]  Victor Giurgiutiu,et al.  Experimental Investigation of E/M Impedance Health Monitoring for Spot-Welded Structural Joints , 1999 .

[28]  Craig A. Rogers,et al.  Coupled Electro-Mechanical Analysis of Adaptive Material Systems — Determination of the Actuator Power Consumption and System Energy Transfer , 1994 .