scholarly journals Damage Detection with Auxiliary Subsystem

2008 ◽  
Vol 56 ◽  
pp. 401-413 ◽  
Author(s):  
Fabrizio Vestroni ◽  
J. Ciambella ◽  
Francesco dell'Isola ◽  
Stefano Vidoli
Keyword(s):  
Damage Detection ◽  
Mechanical System ◽  
Mechanical Characteristics ◽  
Piezoelectric Transducers ◽  
The Other ◽  
Monitoring Systems ◽  
Non Destructive Evaluation ◽  
Highly Sensitive ◽  
Non Destructive ◽  
Remarkable Advantage

Among Non-Destructive Evaluation, vibration-based methods respond to the current ten- dency which is to integrate into the structure identication and monitoring systems; to this aim transducers and sensors are embedded with the mechanical system and driven by suitably designed electronic controllers. The major limit of this and the other indirect identication techniques based on frequency response measurements turns out to be the small sensitivity to local variations of mechanical characteristics: it re ects on a uncertainty on the identied parameters, since it implies a small curvature of any reasonable identication functional build on these quantities. An enlightening example for the application of the proposed technique is given through a beam- like structure coupled to a network of piezoelectric patches. Although the forces exerted by the piezoelectric transducers are not large, the choice of such a kind of actuators/sensors implies the remarkable advantage of dealing with highly sensitive and easily tunable devices.

Part Authentication Using Indirect Electromechanical Impedance Measurements

2020 ◽  
Author(s):  
Mohammad I. Albakri ◽  
Pablo A. Tarazaga
Keyword(s):  
Numerical Solutions ◽  
Numerical Models ◽  
Impedance Measurement ◽  
Piezoelectric Transducers ◽  
Frequency Range ◽  
Impedance Measurements ◽  
Manufacturing Defects ◽  
Electromechanical Impedance ◽  
Non Destructive Evaluation ◽  
Non Destructive

Abstract Motivated by its success as a structural health monitoring solution, electromechanical impedance measurements have been utilized as a means for non-destructive evaluation of conventionally and additively manufactured parts. In this process, piezoelectric transducers are either directly embedded in the part under test or bonded to its surface. While this approach has proven to be capable of detecting manufacturing anomalies, instrumentation requirements of the parts under test have hindered its wide adoption. To address this limitation, indirect electromechanical impedance measurement, through instrumented fixtures or testbeds, has recently been investigated for part authentication and non-destructive evaluation applications. In this work, electromechanical impedance signatures obtained with piezoelectric transducers indirectly attached to the part under test, via an instrumented fixture, are numerically investigated. This aims to better understand the coupling between the instrumented fixture and the part under test and its effects ON sensitivity to manufacturing defects. For this purpose, numerical models are developed for the instrumented fixture, the part under test, and the fixture/part assembly. The frequency-domain spectral element method is used to obtain numerical solutions and simulate the electromechanical impedance signatures over the frequency range of 10–50 kHz. Criteria for selecting the frequency range that is most sensitive to defects in the part under test are proposed and evaluated using standard damage metric definitions. It was found that optimal frequency ranges can be preselected based on the fixture design and its dynamic response.

Neutron Diffraction as a Tool for Non-Destructive Evaluation of Ceramics

1988 ◽  
Vol 142 ◽  
Author(s):  
John H. Root ◽  
James D. Sullivan
Keyword(s):  
Grain Size ◽  
Neutron Diffraction ◽  
Residual Strain ◽  
Mechanical Characteristics ◽  
Condensed Matter ◽  
Ceramic Composites ◽  
Non Destructive Evaluation ◽  
Minority Phase ◽  
Position Dependence ◽  
Non Destructive

AbstractNeutron diffraction is a powerful probe of the properties of condensed matter. In recent years neutron diffraction has been applied to the non-destructive evaluation of mechanical characteristics of engineering components. This paper presents examples of applications to ceramic composites including the measurement of position dependence of residual strain, grain size and minority phase concentration. In addition, an example of volume-averaged crystallographic texture is presented.

Fatigue Damage Detection Using Smart Senor

2014 ◽  
Vol 608-609 ◽  
pp. 844-849
Author(s):  
Wen Hao Fu
Keyword(s):  
Structural Health Monitoring ◽  
Service Life ◽  
Damage Detection ◽  
Real Time ◽  
Fatigue Damage ◽  
Health Monitoring ◽  
Mechanical Impedance ◽  
Huge Amount ◽  
Non Destructive Evaluation ◽  
Non Destructive

In civil engineering field, huge amount of structural health monitoring work is required throughout the service life of the structures. In pursuing an autonomous, real-time and online non-destructive evaluation (NDE) method, piezo-impedance transducer (PZT) has attracted more and more attention from researchers in recent years. Although up to now, the real application of Electro-Mechanical Impedance (EMI) method with PZT on structure health monitoring is not utilized, experiments results shows its impressive potential.

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