Quantifying the vibrothermographic effect

Quantifying the vibrothermographic effect,10.1016/j.ndteint.2011.07.006,Ndt & E International,Stephen D. Holland,Christopher Uhl,Zhong Ouyang,Tom Bant

Quantifying the vibrothermographic effect   (Citations: 1)
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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.
Journal: Ndt & E International - NDT E INT , vol. 44, no. 8, pp. 775-782, 2011
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    • ...This study is described in Holland et al. [6]...
    • ...Holland et al. [6, 7] have developed an algorithm, based on a physical model, to reduce the vibrothermography sequence-of-image data in each experimental measurement into a scalar measure of temperature increase...
    • ...For each vibrothermographic inspection, the scalar heat-increase response and dynamic stress were obtained from the sequence of infrared images and the vibrometer records, as described in [6]...
    • ...Both the physical model relating heat-increase to vibration [6, 7] and our statistical analysis suggest that the logarithm of heat-increase is a linear function of the logarithm of crack length for a fixed level of dynamic stress...

    Ming Liet al. Quantitative Multi-Inspection-Site Comparison of Probability of Detect...

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