Application of the Fatigue Crack Opening/Closing Effect for SHM Using Electromechanical Impedance Technology

Earlier the effect of fatigue crack opening/closing (FCOC) to ultrasound guided wave propagation was investigated. The purpose of this article is to evaluate this effect to the electromechanical impedance (EMI) of the system "piezoelectric transducer / host structure. Experimental study performed using the flat samples of aluminum alloy. One of them had the 4 mm central hole. Other sample after fatigue testing had central fatigue crack of 40 mm length (including a 4 mm central hole for the initiation of a fatigue crack. Each sample was loaded by tensile axial static load from zero to 12 kN and the EMI measurement after eacn 2 kN incrementat of load. The EMI was measured in the frequency range of 20-40 kHz. It is established that the FCOC effect to magnitude and reactance of EMI mainly associated with variation of the capacitance of PZT under mechanical load. But the effect to the PZT resistance is more complex and more significant. The result of the study is the base of some procedure of fatigue crack detecting by the EMI method without baseline use. The developed model of EMI of ’host structure – PZT’ that is based on the modal decomposition of dynamic response of this system allows to solve main problems of the SHM system designing and optimizing of its parameters.

[1]  Douglas E. Adams,et al.  Health monitoring of structural materials and components : methods with applications , 2007 .

[2]  Liangsheng Wang,et al.  Structural damage identification for thin plates using smart piezoelectric transducers , 2005 .

[3]  Vitālijs Pavelko,et al.  Fatigue Crack Open Effect to Lamb Wave in Thin Al Sheet , 2011 .

[4]  Pressure Sensing Using Electrostatic Capacitance , 2006 .

[5]  Igor Pavelko,et al.  Bolt-joint structural health monitoring by the method of electromechanical impedance , 2014 .

[6]  S. Rokhlin,et al.  In situ ultrasonic monitoring of surface fatigue crack initiation and growth from surface cavity , 2003 .

[7]  Craig A. Rogers,et al.  Integration and Design of Piezoceramic Elements in Intelligent Structures , 1995 .

[8]  Zhigang Suo,et al.  The effect of stress on the dielectric properties of barium strontium titanate thin films , 1999 .

[9]  S. Rokhlin,et al.  In situ ultrasonic measurement of crack closure , 2003 .

[10]  Igors Pavelko,et al.  The Effect of Lamb Wave Interaction with Fatigue Crack in Thin Al Sheet , 2011 .

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

[12]  Vitalijs Pavelko,et al.  Electromechanical impedance for SHM of aircraft bolted joints , 2013, Smart Structures.

[13]  STRESS STATE AND STRENGTH OF THE PIEZOCERAMICS AT STATIC LOAD , 2011 .

[14]  Vitalijs Pavelko,et al.  New applications of a model of electromechanical impedance for SHM , 2014, Smart Structures.

[15]  Igor Pavelko,et al.  Application of Fatigue Crack Open Effect for Aircraft Structural Health Monitoring , 2011 .

[16]  Alphonse F. Lignelli.  Fatigue crack growth : mechanics, behavior and prediction , 2009 .

[17]  Marc Kamlah,et al.  Effects of uniaxial prestress on the ferroelectric hysteretic response of soft PZT , 2005 .

[18]  Victor Giurgiutiu,et al.  7 – PIEZOELECTRIC WAFER ACTIVE SENSORS , 2008 .

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

[20]  Chee Kiong Soh,et al.  Application of Electromechanical Impedance Technique for Engineering Structures: Review and Future Issues: , 2010 .

[21]  Jakob König,et al.  Uniaxial stress dependence of the dielectric permittivity of the Na0.5Bi0.5TiO3–KTaO3 system , 2012 .

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

[23]  Yi Xiao,et al.  A New Concept for Structural Health Monitoring of Bolted Composite Joints , 2007 .

[24]  J. Suchanicz,et al.  Axial Pressure Effect on Dielectric and Ferroelectric Properties of K 0.5 Bi 0.5 TiO 3 Ceramic , 2003 .

[25]  Suresh Bhalla,et al.  Structural Health Monitoring by Piezo–Impedance Transducers. II: Applications , 2004 .

[26]  Yozo Fujino,et al.  Quantitative health monitoring of bolted joints using piezoceramic actuator-sensor , 2003, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[27]  Suresh Bhalla,et al.  Structural Health Monitoring by Piezo-Impedance Transducers. I: Modeling , 2004 .

[28]  C. Soh,et al.  STRUCTURAL HEALTH MONITORING BY PIEZO-IMPEDANCE TRANSDUCERS , 2009 .

[29]  Marc Kamlah,et al.  Effects of Bias Electric Fields on the Non-linear Ferroelastic Behavior of Soft Lead Zirconate Titanate Piezoceramics , 2005 .

[30]  C. W. Lim,et al.  Quantitative structural damage detection using high‐frequency piezoelectric signatures via the reverberation matrix method , 2007 .

[31]  Pascal Marchet,et al.  Axial Pressure Influence on Dielectric and Ferroelectric Properties of Na0.5Bi0.5TiO3 Ceramic , 2001 .

[32]  Vitalijs PAVELKO,et al.  Structural Health Monitoring of Aircraft Structure by Method of Electromechanical Impedance , 2011 .