Quantitative Determination of Porosity by Active Thermography

Hendorfer, G.; Mayr, G.; Zauner, Gerald; Haslhofer, M.; Pree, R.

doi:10.1063/1.2718039

Cited by 22 publications

(14 citation statements)

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“…Thereby a time domain procedure which is closely related to the standardized Parker's method [6] is applied in the time domain to determine material parameters. This method is based on a transformation of the rear-face temperature in a semi-logarithmic domain [7,8]. The results of both methods are shown in table 4.…”

Section: Measurementsmentioning

confidence: 99%

Quantitative application of pulse phase thermography to determine material parameters

Stotter¹,

Gresslehner²,

Mayr³

et al. 2014

Proceedings of the 2014 International Conference on Quantitative InfraRed Thermography

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This work presents a method to determine material parameters of pulse thermography data transformed form the time domain into the frequency domain. The procedure for determining the material parameters is based on a 1D solid model. At first a physically correct and piecewise continuous trial function is fitted to the measured temperature curve in the time domain. At next the trial function is transformed in the frequency domain by Integral Fourier transformation. In the frequency domain the Green's function method is used to solve the heat conduction equation analytically. To determine material parameters of the inspected specimen, the phase curve of the analytical solution of the heat conduction equation is fitted to the phase curve of the transformed trial functions. Using this method, the parameters ω0, B1 and H can be determined which correspond to the material parameters L,  and k as well as the heat transfer coefficients h1 and h2.

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Section: Measurementsmentioning

confidence: 99%

Quantitative application of pulse phase thermography to determine material parameters

Stotter¹,

Gresslehner²,

Mayr³

et al. 2014

Proceedings of the 2014 International Conference on Quantitative InfraRed Thermography

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“…This approach is advantageous as compared to fitting procedures because it is very fast and allows usage of analytical formulas. The analysis of that approach, which is described in detail in reference (Hendorfer et al, 2006), yields the thermal diffusivity as a quantity averaged over the sample thickness. In all cases, presented in the following chapter images of the thermal diffusivity are given.…”

Section: Thermal Diffusivity Imagingmentioning

confidence: 99%

Characterization of defects in curved carbon fiber reinforced plastics using pulsed thermography

Mayr

Hendorfer

2010

Quantitative InfraRed Thermography Journal

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Results obtained from pulsed thermography on curved specimens made out of carbon fiber reinforced plastics are presented. In the specimens, inclusions of Teflon stripes with different sizes and orientation are positioned at different depths. Especially in the curved regions, it is important to separate defect-related effects on the surface temperature from effects due to the complex sample shape like curvatures or edges. The usage of 3D finite element simulation, taking into account anisotropic heat conduction and inhomogeneous heat excitation as well as orientation dependent heat absorption, makes it possible to interpret the thermographic result in order to reduce geometry effects.

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“…Many techniques have been investigated for estimation of porosity in fiber reinforced composites [5][6][7][8][9][10][11][12][13]. Some are destructive like the acid digestion [5,10], which can supply information only by statistical inference and so has to be regarded as a reference rather than a quality assessment method.…”

Section: Introductionmentioning

confidence: 99%

Porosity Distribution in Composite Structures with Infrared Thermography

Toscano

Meola

Carlomagno

2013

Journal of Composites

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Composite structures are increasingly used in the transport industry especially in the aeronautical sector thanks to their favorable strength-to-weight ratio with respect to metals. However, this is true if the final part is defects free and complies with quality requirements. A main weakness in composites is porosity, which is likely to be introduced during manufacturing processes and which may knock down the material characteristics affecting its performance in service. Porosity plays a key role in sandwich structures, which involve novel metal foams as core, since the foam performance strongly depends on size and distribution of pores. The determination of porosity is mostly attained by destructive methods, which supply only a general indication linked to the production part number. Conversely, composites may entail local significant variation of porosity, which may be discovered only with effective nondestructive techniques. The attention of the present work is focused on the possibility to use infrared thermography to get information about the amount and distribution of porosity. In particular, two techniques: flash thermography and lock-in thermography are used to comply with requirements of both monolithic composites and metal foams.

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Quantitative Determination of Porosity by Active Thermography

Cited by 22 publications

References 0 publications

Quantitative application of pulse phase thermography to determine material parameters

Quantitative application of pulse phase thermography to determine material parameters

Characterization of defects in curved carbon fiber reinforced plastics using pulsed thermography

Porosity Distribution in Composite Structures with Infrared Thermography

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