Importance of Acoustic Chaos in Sonic IR Imaging NDE

Han, Xiaoyan; Zhi, Zeng; Li, Wei; Islam, Md. Sawar; Lu, Jinsheng; Loggins, V. R.; Favro, L. D.; Newaz, Golam; Thomas, R. L.

doi:10.1063/1.1711663

Cited by 6 publications

(2 citation statements)

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“…They noted that heat generation at the delaminations increased when samples were vibrated at certain resonant frequencies. Subsequently, many similar experiments have been performed on samples containing cracks and other defects [1,4,5]. It has been shown that regions of heat generation along a crack correspond to contacting regions in the crack and the location of these regions changes as the crack is opened with an external load [5,6].…”

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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show abstract

“…Many technical possibilities can stimulate and vibrate the components, such as using sonotrodes [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45], where 20 to 40 kHz signals are transmitted with high energy to the component to be measured. This creates a quasi-chaotic excitation, since single impulses are mainly transmitted and no periodic signals [18,20,34,38,43,[45][46][47][48]. A disadvantage is that damage to the contact surface of the sonotrode with the test component can occur [31,33,38,44].…”

Section: Rahammer Et Al Conducted Vibrothermal Tests In Composites Us...mentioning

confidence: 99%