Sonic Infrared (IR) Imaging and Fluorescent Penetrant Inspection Probability of Detection (POD) Comparison

DiMambro, Joseph; Ashbaugh, Dennis M.; Nelson, Ciji L.; Spencer, Floyd W.

doi:10.1063/1.2718008

Cited by 23 publications

(12 citation statements)

References 3 publications

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“…Radiated heat is observed and measured using an infrared (IR) camera observing the surface of the structure containing the defect indications. There is significant industrial interest in vibrothermography due to its ability to rapidly and accurately detect cracks and other defects in structures [2]; however, it has been hindered by issues such as repeatability [1], due in part, to a lack of understanding of the physics governing the heat generation process in vibrating defects.…”

Section: Introductionmentioning

confidence: 99%

The sources of heat generation in vibrothermography

Renshaw

Chen

Holland

et al. 2011

NDT & E International

157

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Vibrothermography, or sonic IR, is a nondestructive evaluation technique used to find surface and near surface defects-such as cracks and delaminations-through observations of vibration-induced heat generation. This method has significant interest as an industrial inspection method, however, a lack of understanding of the fundamental physics governing the heat generation process has limited its application despite extensive theoretical, numerical simulation, and experimental work. Significant theoretical and numerical simulation work has been performed, but has yet to be rigorously verified experimentally. This paper presents experimental verification of the sources of heat generation in vibrothermography; specifically friction, plasticity, and viscoelasticity. Specific experimental evidence is presented that verifies each of these heat-generating mechanisms.

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Section: Introductionmentioning

confidence: 99%

The sources of heat generation in vibrothermography

Renshaw

Chen

Holland

et al. 2011

NDT & E International

157

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“…Thermosonics is seen as a quick NDT screening method capable of detecting cracks in metallic components [2][3][4]. It employs high-power ultrasound and thermal imaging for crack detection, as illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Crack Propagation in Turbine Blades Caused by Thermosonics

Bolu¹,

Gachagan²,

Pierce³

et al. 2010

AIP Conference Proceedings

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High-power acoustic excitation of components during a thermosonic (or Sonic IR) inspection may degrade the structural integrity of the component by propagating existing cracks. Process Compensated Resonance Testing (PCRT) technology can be used to detect changes in material properties by comparing a components resonant spectra to a reference spectra at regular intervals after systematic exposure to high-power excitation associated with thermosonic inspection. The objective of this work is to determine whether a typical thermosonic inspection degrades the structural integrity of a turbine blade. In this work, the resonant spectra of six cracked and six uncracked turbine blades are captured before and after a series of thermosonic inspections. Next, these spectra are analyzed using proprietary software for changes in resonant behavior. Results from this work indicate no change in blade resonant behavior for a typical thermosonic inspection.

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“…A more viable alternative is to predict the reliability of the vibrothermographic test through relating the local vibration in the vicinity of the crack (or the vibration's statistics) with known depen-dence of crack heating on vibration. There have been previous large-scale investigations of parameter sensitivity [13] and POD [14], but without a way to quantify the physical stimulus the crack was exposed to, there is no clear way to extrapolate these results beyond the specific geometries involved.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the vibrothermographic effect

Holland

Uhl²,

Ouyang

et al. 2011

NDT & E International

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Vibrothermography, also known as Sonic IR and thermosonics, is a method for finding cracks through thermal imaging of vibration-induced crack heating. Due to large experimental variability and equipment which has, up to now, yielded mostly qualitative results, little data has been available to help quantify the vibrothermographic effect. This paper quantitatively evaluates the relationship between vibrothermographic crack heating, crack size, and vibrational stress in a series of tests on 63 specimens each of Ti-6-4 titanium and Inconel 718 at three different sites with different equipments. Test specimens are excited in a resonant mode. Infrared cameras record the crack heating, and vibrational stress is evaluated from the known vibrational mode shape combined with vibrational velocities measured using a laser vibrometer. Crack heating increases both with crack length and dynamic vibrational stress level. Data from all three sites gives similar probability of detection (POD) curves. The relationship of crack heating to crack size and vibrational stress will provide a means in the future to predict crack detectability based on vibration measurements. (POD) curves. The relationship of crack heating to crack size and vibrational stress will provide a means in the future to predict crack detectability based on vibration measurements

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Sonic Infrared (IR) Imaging and Fluorescent Penetrant Inspection Probability of Detection (POD) Comparison

Cited by 23 publications

References 3 publications

The sources of heat generation in vibrothermography

The sources of heat generation in vibrothermography

Monitoring Crack Propagation in Turbine Blades Caused by Thermosonics

Quantifying the vibrothermographic effect

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