Monitoring of Growing Fatigue Damage Using the E/M Impedance Method

Xing, Ke Jia; Fritzen, Claus‐Peter

doi:10.4028/www.scientific.net/kem.347.153

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…Common to all these approaches is the assumption that a structural damage leads to an effect in the signal of several sensors, while a defect sensor only changes the signal of the sensor itself. This assumption is not always valid as shown in [14]. Moreover all these approaches are purely mathematical without a relation to physical quantities.…”

Section: Introductionmentioning

confidence: 99%

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Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Mueller

Fritzen

2017

Materials

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The use of piezoelectric wafer active sensors (PWAS) for structural health monitoring (SHM) purposes is state of the art for acousto-ultrasonic-based methods. For system reliability, detailed information about the PWAS itself is necessary. This paper gives an overview on frequent PWAS faults and presents the effects of these faults on the wave propagation, used for active acousto-ultrasonics-based SHM. The analysis of the wave field is based on velocity measurements using a laser Doppler vibrometer (LDV). New and established methods of PWAS inspection are explained in detail, listing advantages and disadvantages. The electro-mechanical impedance spectrum as basis for these methods is discussed for different sensor faults. This way this contribution focuses on a detailed analysis of PWAS and the need of their inspection for an increased reliability of SHM systems.

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Section: Introductionmentioning

confidence: 99%

“…The resonances of the structure are focused in a frequency range apart from the resonances of the PWAS. For fatigue damage of the structure, this is shown in [14,28]. For truss or beam like structures, the use of the electro-mechanical impedance spectrum for structural damage detection is discussed e.g., in [29,30,31].…”

Section: Introductionmentioning

confidence: 99%

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Mueller

Fritzen

2017

Materials

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“…In recent years, the Electromechanical Impedance (EMI) technique has emerged as a promising structural health monitoring (SHM) method. It has been successfully applied to various engineering disciplines, including aerospace and aircraft structures [ 1 – 6 ] and civil structures [ 7 – 9 ]. In this technique, a piezoelectric ceramic lead-zirconate-titanate (PZT) patch is surface bonded to the monitored structure or embedded into a new composite construction and excited by an alternating voltage sweeping signal.…”

Section: Introductionmentioning

confidence: 99%

Electromechanical Impedance Response of a Cracked Timoshenko Beam

Zhang

Chen

et al. 2011

Sensors

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Typically, the Electromechanical Impedance (EMI) technique does not use an analytical model for basic damage identification. However, an accurate model is necessary for getting more information about any damage. In this paper, an EMI model is presented for predicting the electromechanical impedance of a cracked beam structure quantitatively. A coupled system of a cracked Timoshenko beam with a pair of PZT patches bonded on the top and bottom surfaces has been considered, where the bonding layers are assumed as a Kelvin-Voigt material. The shear lag model is introduced to describe the load transfer between the PZT patches and the beam structure. The beam crack is simulated as a massless torsional spring; the dynamic equations of the coupled system are derived, which include the crack information and the inertial forces of both PZT patches and adhesive layers. According to the boundary conditions and continuity conditions, the analytical expression of the admittance of PZT patch is obtained. In the case study, the influences of crack and the inertial forces of PZT patches are analyzed. The results show that: (1) the inertial forces affects significantly in high frequency band; and (2) the use of appropriate frequency range can improve the accuracy of damage identification.

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“…Subsequent applications of the EMI method were reported by several researchers [10][11][12][13][14]. Since then, the EMI based SHM method has been widely applied to various engineering structures [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional modeling of the effects of external vibration on the PZT impedance signature

Yang¹,

Miao²

2010

Smart Mater. Struct.

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The electromechanical impedance (EMI) technique using piezoelectric ceramic lead zirconate titanate (PZT) transducers has been increasingly applied to structural health monitoring (SHM) of aerospace, civil and mechanical structures. The PZT transducers are usually surface bonded to or embedded in a structure and subjected to actuation so as to interrogate the structure at the desired frequency range. The interrogation results in electromechanical admittance (inverse of EMI) signatures which can be used to estimate the structural health or integrity according to the changes of the signatures. In the existing EMI method, the vibration of the structure caused by the external excitations has been considered only for the one-dimensional scenario. This paper develops a two-dimensional EMI model to account for the effect of external excitation on the PZT admittance signature. An application is illustrated with modeling of a cantilevered Kirchhoff plate interrogated by a single surface-bonded PZT transducer. Experiments and numerical simulations are also carried out to verify the theoretical model. Finally, the effects of external excitation on PZT impedance signatures are discussed.

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Monitoring of Growing Fatigue Damage Using the E/M Impedance Method

Cited by 8 publications

References 6 publications

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Electromechanical Impedance Response of a Cracked Timoshenko Beam

Two-dimensional modeling of the effects of external vibration on the PZT impedance signature

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