Numerical estimation of the spatial resolution of thermal NDT techniques based on flash heating

Rantala, Jukka; Hartikainen, J.

doi:10.1007/bf01613125

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…Rantala et al [13]. It is worth mentioning that there is plenty of papers facing the defect depth estimation, but this specific topic is out of the scope of this work, being delaminations more likely to be close to the interface between ceramic and metallic substrate, and thus this specific information is already known.…”

Section: Nde Tbc Delamination Pulse Thermographymentioning

confidence: 96%

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Thirty Years of Thermal Barrier Coatings (TBC), Photothermal and Thermographic Techniques: Best Practices and Lessons Learned

Cernuschi

Bison

2022

J Therm Spray Tech

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With the adoption of thermal barrier coatings (TBCs) to protect the hot parts of gas turbines at the end of the last century, the characterization of their thermophysical properties and the evaluation of their state of integrity has become necessary. That leads to the development and/or the adaptation of photothermal and thermographic techniques to meet the newly requirements that have emerged. Whereas this is not an all-encompassing review of all the literature on the subjects, this work summarizes the research and the development of techniques specifically aimed at measuring the thermophysical properties, the characterization of the microstructure and the identification of adhesion defects to the metal component of the TBCs. In the following, the best practices, the lessons learned, the successes and the defeats experienced along almost thirty years will be summarized.

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Section: Nde Tbc Delamination Pulse Thermographymentioning

confidence: 96%

“…In these papers, a website link for running a code simulating the sintering of an APS TBC sample is also provided 13. A. Limarga et al provided a significative contribution to this topic showing that the Raman peaks shift of YPSZ samples can be described as a function of aging time and temperature by using the LMP, as well (Ref 112).…”

mentioning

confidence: 99%

Thirty Years of Thermal Barrier Coatings (TBC), Photothermal and Thermographic Techniques: Best Practices and Lessons Learned

Cernuschi

Bison

2022

J Therm Spray Tech

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“…The computational method used for evaluating the heat diffusion equation follows the CranckNicolson finite difference scheme and it has been described on several earlier works also [5][6][7]. A delamination (14 rom x 22 mm) characterized by a thermal contact resistance, Rc, was placed either between the first and the second or the second and the third layer (Fig.…”

Section: Methodsmentioning

confidence: 99%

A Numerical Study on Temperature Distribution of Line Heated Anisotropic Carbon Fiber Composites

Varis

Rantala

Hartikainen³

et al. 1995

Review of Progress in Quantitative Nondestructive Evaluation

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“…By using the 'ghost points' to balance the heat flux, the heat transfer model avoids the need of the very fine mesh spacing that is necessary to deal with real cracks that often have openings of only a few micrometres [12,13,40]. In the following simulations, the boundary conditions for all metal samples are assumed to be insulation.…”

Section: D Finite Difference Modellingmentioning

confidence: 99%

Crack imaging by scanning laser-line thermography and laser-spot thermography

Almond

Rees

2011

Meas. Sci. Technol.

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The thermographic images of laser heated spots or lines are perturbed by nearby cracks, providing NDE techniques for crack detection. Scanning with a laser line, rather than a laser spot, results in a substantial reduction in inspection time. 3D finite difference modelling results are presented that show the sensitivity of the laser line thermography technique to cracks of varying lengths, depths and openings. A novel crack imaging technique is presented that is based on assembling second spatial derivative thermal images of a scanned laser line. Experimental results show the new technique to image cracks with openings as small as a few micrometres. The scanning time of the laser line thermography technique is shown to be over an order of magnitude smaller than that of the laser spot thermography technique whilst producing crack images of similar quality.

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Numerical estimation of the spatial resolution of thermal NDT techniques based on flash heating

Cited by 6 publications

References 7 publications

Thirty Years of Thermal Barrier Coatings (TBC), Photothermal and Thermographic Techniques: Best Practices and Lessons Learned

Thirty Years of Thermal Barrier Coatings (TBC), Photothermal and Thermographic Techniques: Best Practices and Lessons Learned

A Numerical Study on Temperature Distribution of Line Heated Anisotropic Carbon Fiber Composites

Crack imaging by scanning laser-line thermography and laser-spot thermography

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