Absorptive viscoelastic coatings for full field vibration coverage measurement in vibrothermography

Vaddi, Jyani Somayajulu; Holland, Stephen D.; Kessler, Michael R.

doi:10.1016/j.ndteint.2016.04.004

Cited by 18 publications

(11 citation statements)

References 14 publications

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“…As mentioned in section 2.3, the vibration coverage data presented in several works [72,84,110] indicate that at the specimen resonances usually used in UET experiments, the vibration strain is uneven, maximum at antinodes and minimum at nodes. This indicates that in order to determine a probability of detection, not only crack size, but also crack position and orientation should be taken into account, together with crack closure state, which is a difficult task.…”

Section: Detectability Of Cracks and Reproducibility Of Experimentsmentioning

confidence: 91%

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Ultrasound excited thermography: an efficient tool for the characterization of vertical cracks

Mendioroz

Celorrio

Salazar

2017

Meas. Sci. Technol.

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Ultrasound excited thermography has gained a renewed interest in the last two decades as a nondestructive testing technique aimed at detecting and characterizing surface breaking and shallow subsurface discontinuities. It is based on measurement of the IR radiation emitted by the specimen surface to detect temperature rises produced by the heating of defects under high amplitude ultrasound excitation and is primarily addressed to flaws with contacting faces, such as kissing cracks or tight delaminations. The simplicity of application and the ability to detect small cracks in challenging media makes it an attractive emerging technology, which is still in a development stage. However, it has proven to provide an opportunity for the quantitative characterization of defects, mainly of vertical cracks. In this review, we present the principles of the technique and the different experimental implementations, we put it in context with other nondestructive tests and we summarize the work done in order to improve defect detectability and test reliability, with the final goal of determining the probability of detection. Then we review the contributions aimed at characterizing vertical cracks, i.e. retrieving the geometry and location of the crack from surface temperature data, generated by ultrasonic excitation.

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Section: Detectability Of Cracks and Reproducibility Of Experimentsmentioning

confidence: 91%

“…In a recent work, researchers of the same group [110] proposed the use of a viscoelastic coating on a metallic part to evaluate the vibration strain distribution from the temperature rise map of the polymer adhesive. The method provides full vibration coverage in a UET test.…”

Section: Detectability Of Cracks and Reproducibility Of Experimentsmentioning

confidence: 99%

Ultrasound excited thermography: an efficient tool for the characterization of vertical cracks

Mendioroz

Celorrio

Salazar

2017

Meas. Sci. Technol.

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“…The self-heating effect was used for NDT purposes in numerous applications, e.g., for NDT damage characterization in carbon fiber-reinforced polymers (CFRP) [1,24]. The self-heating effect was also mentioned in the context of NDT of polymeric and PMC structures in [31,150,151], in terms of classical vibrothermography.…”

Section: Self-heating-based Vibrothermographymentioning

confidence: 99%

Criticality of the Self-Heating Effect in Polymers and Polymer Matrix Composites during Fatigue, and Their Application in Non-Destructive Testing

Katunin

2018

Polymers

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The self-heating effect is a dangerous phenomenon that occurs in polymers and polymer matrix composites during their cyclic loading, and may significantly influence structural degradation and durability as a consequence. Therefore, an analysis of its criticality is highly demanding, due to the wide occurrence of this effect, both in laboratory fatigue tests, as well as in engineering practice. In order to overcome the problem of the accelerated degradation of polymer matrix structures, it is essential to evaluate the characteristic temperature values of self-heating, which are critical from the point of view of the fatigue life of these structures, i.e., the temperature at which damage initiates, and the safe temperature range in which these structures can be safely maintained. The experimental studies performed were focused on the determination of the critical self-heating temperature, using various approaches and measurement techniques. This paper present an overview of the research studies performed in the field of structural degradation, due to self-heating, and summarizes the studies performed on the evaluation of the criticality of the self-heating effect. Moreover, the non-destructive testing method, which uses the self-heating effect as a thermal excitation source, is discussed, and the non-destructivity of this method is confirmed by experimental results.

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“…The results showed that engagement force and excitation intensity have significant influences on the temperature rising, and the optimized test conditions can be determined based on the probability of detection (POD) and probability of alarm (POA). Additionally, some investigations were performed on the structural vibration behavior of specimens for vibrothermography, which show there exists relationships between the vibration response (strain, displacements) and the temperature response due to the hysteretic heating generated by viscoelastic or frictional heating [ 37 ].…”

Section: Brief Literature Reviewmentioning

confidence: 99%

Experimental Investigation on the Detection of Multiple Surface Cracks Using Vibrothermography with a Low-Power Piezoceramic Actuator

Xie

Zhang

et al. 2017

Sensors

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Vibrothermography often employs a high-power actuator to generate heat on a specimen to reveal damage, however, the high-power actuator brings inconvenience to the application and possibly introduces additional damage to the inspected objects. This study uses a low-power piezoceramic transducer as the actuator of vibrothermography and explores its ability to detect multiple surface cracks in a metal part. Experiments were conducted on a thin aluminum beam with three cracks in different orientations. Detailed analyses of both thermograms and temperature data are presented to validate the proposed vibrothermography method. To further investigate the performance of the proposed vibrothermography method, we experimentally studied the effects of several critical factors, including the amplitude of excitation signal, specimen constraints, relative position between the transducer and cracks (the transducer is mounted on the same or the opposite side with the cracks). The results demonstrate that all cracks can be detected conveniently and simultaneously by using the proposed low-power vibrothermography. We also found that the magnitude of excitation signal and the specimen constraints have a great influence on detection results. Combined with effective data processing methods, such as Fourier transformation employed in this study, the proposed method provides a promising potential to detect multiple cracks on a metal surface in a safe and effective manner.

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Absorptive viscoelastic coatings for full field vibration coverage measurement in vibrothermography

Cited by 18 publications

References 14 publications

Ultrasound excited thermography: an efficient tool for the characterization of vertical cracks

Ultrasound excited thermography: an efficient tool for the characterization of vertical cracks

Criticality of the Self-Heating Effect in Polymers and Polymer Matrix Composites during Fatigue, and Their Application in Non-Destructive Testing

Experimental Investigation on the Detection of Multiple Surface Cracks Using Vibrothermography with a Low-Power Piezoceramic Actuator

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