Thermographic investigation of high-power ultrasonic heating in materials

Mignogna, R. B.; Green, R.E.; Duke, J. C.; Henneke, E. G.; Reifsnider, KL

doi:10.1016/0041-624x(81)90095-0

Cited by 154 publications

(71 citation statements)

References 5 publications

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“…The basic principle is based on theory that as defects may be areas where mechanical damping and friction losses primarily take place, the vibro-acoustic energy is converted into heat mainly in defects than in sound areas, resulting in a defect selective dark field method [9]. Thus, in contrast to energy deposition by means of external heat sources, ultrasound excited thermography uses internal heat generation by inducing high-frequency elastic waves into the sample.…”

Section: Ultrasound Lock-in Thermographymentioning

confidence: 99%

Ultrasound lockin thermography as a quantitative technique for quality control assessment of cast iron turbine components

Montanini¹,

Rossi²,

Freni³

2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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This paper explores the application of ultrasound activated infrared thermography for the detection and quantification of flaws in industrial cast iron turbocharger components. The use of amplitude modulated ultrasonic heat generation allowed selective response of defected area, since the defect itself is turned into a local thermal wave emitter. Due to the very fast cycle time (< 30 s/part), the method could potentially be applied for 100% quality control of cast parts.After a brief description of the measurement technique and experimental setup used to carry out the tests, main results and discussion are reported. Most emphasis has been addressed to assess the influence of different operative parameters on defect's detection capability as well as accurate sizing of the discontinuity.

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Section: Ultrasound Lock-in Thermographymentioning

confidence: 99%

Ultrasound lockin thermography as a quantitative technique for quality control assessment of cast iron turbine components

Montanini¹,

Rossi²,

Freni³

2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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“…The higher attenuation of elastic waves near defect sites emerges e.g. from local changes in material stiffness or a higher mechanical loss angle by interfacial friction [21,22]. When the ultrasonic waves are amplitude modulated, the defect sites are initial points of thermal waves with the same modulation frequency as the ultrasonic waves, which may also be analysed by the lock-in method [23].…”

Section: Active Thermographymentioning

confidence: 99%

Active and passive thermography for defect detection in polymer joints

Leicht¹,

Heilig²,

Pommer³

et al. 2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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Non-destructive testing (NDT) is a growing field in quality monitoring in the plastics industry, as it offers the possibility to lower the expenses for quality assurance without lowering the quality level. Passive thermography is being established as a method for automatic on-line monitoring of the weld quality in joined plastics. Active thermography is an established method in quality assurance of composite materials, but further experience is necessary in the field of polymer joints. In this work, passive and active thermography have been evaluated for their sensitivity to common defects known in weld joints and adhesive bonds of polymers.

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“…This is actually the case when ambient heat is applied on top surface of the specimen or structure. The heat source can be either natural, such as the sun, or artificial, such as the high-power ultrasound [6]. We should note that in the case of internal heating or applying heat from underneath the specimen, a normal practice in laboratory experiments, the surface that is exposed to the delamination will appear cooler than the sound area in a thermal image.…”

Section: Introductionmentioning

confidence: 99%

Concrete Pavement Service Condition Assessment Using Infrared Thermography

Golrokh

Islam

2017

Advances in Materials Science and Engineering

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Infrared thermography (IRT), an effective nondestructive testing method, is used to obtain an initial evaluation of the concrete pavement surface and near surface in a time effective manner. In this paper, the effect of the depth of delamination inside concrete pavement on infrared thermography technique is studied for bridge decks inspection. To be able to mimic the delamination in subsurface, two Styrofoam cubes have been inserted in different depth near the surface of the concrete cylinder. After heating up the specimen, thermal images were taken from the surface using an infrared thermal camera to evaluate the effect of subsurface defects on detection sensitivity and accuracy. We also investigated the precision to which the shape and the size of the subsurface anomalies can be perceived using an uncooled thermal camera. To achieve this goal, we used image processing technique to accurately compute the size of delamination in order to compare it with the actual size. In addition, distance/thermal graph is used to detect the presence of the defect underneath the concrete surface. Furthermore, thermal transfer modeling was adopted in this paper to assist the setup of this experiment and the results are compared with laboratory findings.

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Thermographic investigation of high-power ultrasonic heating in materials

Cited by 154 publications

References 5 publications

Ultrasound lockin thermography as a quantitative technique for quality control assessment of cast iron turbine components

Ultrasound lockin thermography as a quantitative technique for quality control assessment of cast iron turbine components

Active and passive thermography for defect detection in polymer joints

Concrete Pavement Service Condition Assessment Using Infrared Thermography

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