Resonant frequency range utilized electro-mechanical impedance method for damage detection performance enhancement on composite structures

2012 ◽  
Vol 94 (8) ◽  
pp. 2383-2389 ◽  
Author(s):  
S. Na ◽  
H.K. Lee
Keyword(s):  
Resonant Frequency ◽  
Damage Detection ◽  
Composite Structures ◽  
Performance Enhancement ◽  
Mechanical Impedance ◽  
Detection Performance ◽  
Impedance Method ◽  
Frequency Range

scholarly journals Detection of Pin Failure in Carbon Fiber Composites Using the Electro-Mechanical Impedance Method

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3732
Author(s):  
Jochen Moll ◽  
Matthias Schmidt ◽  
Johannes Käsgen ◽  
Jörg Mehldau ◽  
Marcel Bücker ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Damage Detection ◽  
Fiber Composite ◽  
Mechanical Impedance ◽  
Impedance Method ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Bending Loads ◽  
Metallic Parts ◽  
Hybrid Carbon

This paper presents a proof of concept for simultaneous load and structural health monitoring of a hybrid carbon fiber rudder stock sample consisting of carbon fiber composite and metallic parts in order to demonstrate smart sensors in the context of maritime systems. Therefore, a strain gauge is used to assess bending loads during quasi-static laboratory testing. In addition, six piezoelectric transducers are placed around the circumference of the tubular structure for damage detection based on the electro-mechanical impedance (EMI) method. A damage indicator has been defined that exploits the real and imaginary parts of the admittance for the detection of pin failure in the rudder stock. In particular, higher frequencies in the EMI spectrum contain valuable information about damage. Finally, the information about damage and load are merged in a cluster analysis enabling damage detection under load.

Damage Detection Using Impedance Measurement With Magnetic Transducer

2009 ◽  
Author(s):  
X. Wang ◽  
J. Tang
Keyword(s):  
Damage Detection ◽  
Experimental Studies ◽  
Impedance Measurement ◽  
Mechanical Impedance ◽  
Design Guidelines ◽  
Impedance Method ◽  
Negative Effects ◽  
Mechanical Coupling ◽  
Magnetic Impedance ◽  
Magnetic Transducer

Impedance method has been explored for damage detection and identification. Typically, when the impedance sensor is integrated onto the mechanical structure to be monitored, its electrical impedance is directly related to the mechanical impedance of the host structure. Thus the change of impedance measurement before and after damage occurrence can be used as the damage indicator. Since the impedance information may be measured at relatively high frequency range, the impedance method could be sensitive to small-sized damage. Generally, piezoelectric transducers are employed in the impedance approach, which can serve as actuator and sensor simultaneously. In this research, a magnetic transducer approach is investigated for impedance based damage detection. To provide design guidelines, the analytical model of the resistive magnetic impedance measurement circuit is formulated. During the formulation, the two-way magneto-mechanical coupling between the transducer and the structure is systematically studied by using the Maxwell’s equations. The preliminary sensor enhancement is achieved by selecting the number of turns of wire in the electrical coil. Moreover, in order to reduce the negative effects of the high inherent inductance and large parasitic resistance of the coil with a large number of turns of wire, a new measurement circuitry is proposed, in which a negative resistive element and a capacitor are introduced to be serially connected with the original resistive circuit. Correlated numerical and experimental studies are carried out to validate the magnetic transducer in impedance based damage detection.

scholarly journals Damage Detection Performance of the Electromechanical Impedance (EMI) Technique with Various Attachment Methods on Glass Fibre Composite Plates

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1000 ◽  
Author(s):  
Rudy Tawie ◽  
Hee Beom Park ◽  
Jongdae Baek ◽  
Wongi S. Na
Keyword(s):  
Damage Detection ◽  
Glass Fibre ◽  
Composite Structures ◽  
Fibre Composite ◽  
Composite Plates ◽  
Detection Performance ◽  
Element Analysis ◽  
Electromechanical Impedance ◽  
Carbon Fibre Composites ◽  
Glass Fibre Composite

Composite materials such as glass and carbon fibre composites have become popular and the preferred choice in various applications due to their many advantages such as corrosion resistance, design flexibility, high strength and light weight. Combining materials with different mechanical properties make composites more difficult to evaluate where the damage mechanisms for composites are more complex than traditional materials such as steel. A relatively new non-destructive testing (NDT) method known as the electromechanical impedance (EMI) technique has been studied by various researchers, but the damage detection performance of the method on composite structures still requires more investigations before it can be accepted for field application, especially in aerospace industry due to the high standard of safety. In this paper, the detection capabilities and performance of the EMI technique subjected to different PZT attachment methods have been investigated. To this end, glass fibre composite plates with various attachment methods for the sensor have been prepared and detection of common defects such as delamination and crack with the EMI technique under study has been performed. The performance of each attachment method for identifying different damage types has been analysed and finite element analysis (FEA) was carried out for verification of the experimental results.

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

2007 ◽  
Vol 347 ◽  
pp. 153-158 ◽  
Author(s):  
Ke Jia Xing ◽  
Claus Peter Fritzen
Keyword(s):  
Damage Detection ◽  
Fatigue Damage ◽  
Basic Concept ◽  
Structural Damage ◽  
Mechanical Impedance ◽  
Impedance Spectrum ◽  
Local Area ◽  
Impedance Method ◽  
Baseline Measurement ◽  
Artificial Damage

The electro-mechanical (E/M) impedance-based method is one important and effective method in damage detection. The basic concept of the impedance method is to monitor the variations in the structural mechanical impedance spectrum caused by damage in the structure. Comparing the impedance spectrum to a baseline measurement of the undamaged structure, the real part of the E/M impedance reflects the state of structural health in the local area, therefore, the structural damage can be localized, a local-area self-sensing method is implemented. In this paper, an aluminium plate mounted on an electromagnetic shaker is used to detect growing fatigue damage using the impedance method. The growing damage is documented by an increase of the indicators. For the case of a static artificial damage the concept is also demonstrated to an Airbus A320 fuselage part using 9 self-sensing elements on the stringers.

scholarly journals Non-Destructive Evaluation (NDE) of Space Application Panels Using Piezoelectric Wafer Active Sensors

2005 ◽  
Author(s):  
Adrian Cuc ◽  
Zeb Tidwell ◽  
Victor Giurgiutiu ◽  
Shiv Joshi
Keyword(s):  
Damage Detection ◽  
Complex Geometry ◽  
Lamb Waves ◽  
Mechanical Impedance ◽  
Impedance Method ◽  
Active Sensors ◽  
Space Applications ◽  
Piezoelectric Wafer Active Sensors ◽  
Investigation Methods ◽  
Piezoelectric Wafer

Ultrasonic guided waves inspection using Lamb waves is suitable for damage detection in metallic structures. This paper will present experimental results obtained using guided Lamb waves to detect flaws in aluminum specimens with design features applicable to space applications. Two aluminum panels were fabricated from a variable-thickness aluminum top plate, with two bolted I-beams edge stiffeners and four bonded angle stiffeners. Artificial damages were introduced in the two panels: cracks, corrosions, and disbonds. The proposed investigation methods used embedded piezoelectric wafer active sensors (PWAS) to excite and receive Lamb waves. Three wave propagation methods were used: pitch-catch, pulse-echo, and the embedded ultrasonic structural radar (EUSR). In addition, we also used a standing-wave damage detection technique, the electro-mechanical impedance method. The paper will present in detail the salient results from using these methods for damage detection and structural health monitoring. Where appropriate, comparison between different methods in detecting the same damage will be performed. The results have demonstrated the ability of piezoelectric wafer active sensors working in conjunction with guided Lamb waves to detect various types of damages present in complex geometry structures typical of space applications.

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