Quantification of roping intensity on aluminium sheets by Areal Power Spectral Density analysis

Guillotin, Alban; Guiglionda, Gilles; Maurice, Claire; Driver, J.H.

doi:10.1016/j.matchar.2010.07.005

Cited by 10 publications

(15 citation statements)

References 12 publications

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“…The effect of stoning can be further amplified or replaced by special inking or painting techniques, as shown in Fig. 1a [16,17,20].…”

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

“…A more objective assessment of surface quality with the possibility for a quantification of the degree of roping requires an experimental determination of the full 3D surface topography. Among the possible techniques for surface measurements, including tactile roughness measurements [6,7], laser-scanning confocal microscopy [10,17] or white-light interferometry [6,11,12,16], the latter stands out due to a large measured area in combination with sufficient spatial resolution to assess roping of Al sheet.…”

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

“…Therefore, the greyscale data of the corrected 3D surface profiles are transformed into Fourier space by means of a discrete fast Fourier transformation, FFT, which is basically a representation within frequency space. For a quantification of the degree of roping the corrected data set is then analysed by the use of the integrated intensities of the amplitudes spectrum of the FFT, in the style of the work by Guillotin et al [17,19]. Figure 2b shows the roping surface of Fig.…”

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

“…For the isotropic component the wavelengths are k = 0.8 mm to 4.7 mm along RD and k = 1 mm to 6.2 mm along TD. Finally, an overall roping grade (ORG) may be obtained by dividing the integrated intensities of the unidirectional component by those of the isotropic component [17]. This point will be addressed later in this paper.…”

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

“…The final definition of the overall roping grade is still subject to debate and needs to be adjusted in cooperation with automotive customers. [17,20], as well as iFFT images (comprising the unidirectional + isotropic part) and the corresponding ORG (e-h).…”

Section: Analysis Of the Four Examples Presented Inmentioning

confidence: 99%

See 4 more Smart Citations

Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysis

Schäfer

Brinkman

Engler

et al. 2015

International Journal of Materials Research

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Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysisThe present study introduces a new method to characterise and evaluate the roping behaviour of aluminium sheet alloys of the AA 6xxx series for car body applications. The new approach combines two known methods into a novel powerful tool, (i) the measurement of a 3D surface topography with a white-light interferometer and (ii) the subsequent data analysis by means of Fourier analysis. Use of the white-light interferometer allows analysing roping of deformed samples without the need of additional surface preparation steps, e. g. inking, stoning, etc., which may falsify the surface appearance. The use of data analysis by means of fast Fourier transform allows differentiating between different surface phenomena, e. g. unidirectional component versus isotropic components. It was found that the new approach is capable of giving reliable and reproducible data, which qualifies this method to study roping in aluminium car body sheets in an objective manner.

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“…The effect of stoning can be further amplified or replaced by special inking or painting techniques, as shown in Fig. 1a [16,17,20].…”

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

Section: Tool For Quantitative Roping Analysismentioning

confidence: 99%

Section: Analysis Of the Four Examples Presented Inmentioning

confidence: 99%

See 3 more Smart Citations

Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysis

Schäfer

Brinkman

Engler

et al. 2015

International Journal of Materials Research

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Correlation of Surface Roping with Through-Thickness Microtextures in an AA6xxx Sheet

Guillotin

Guiglionda²,

Maurice

et al. 2011

Metall Mater Trans A

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Strain-induced surface roughness was quantitatively correlated with microtexture spatial distributions from the surface to the midthickness of a strongly roping AA6016 sheet. The microtexture variations through the sheet were measured by acquiring a series of large area electron backscatter diffraction (EBSD) scans at intervals of about the grain size. The orientations of the different layers were translated into out-of-plane strains using a crystal plasticity model for comparison with the surface roping. The spatial distributions (particularly the characteristic wavelengths) of the microtexture layers were determined by areal auto-correlation functions, and quantitatively compared to the surface appearance by correlation coefficients. The results show that texture banding of Cube/Goss components along the rolling direction is present from the surface to midthickness but with significant variations from one grain layer to another. The wavelength correlation coefficient exhibits a maximum at about 55 lm, or 2 grain thicknesses, below the surface. It is shown that the spatial distribution of Cube/Goss components of the first three or four surface grain layers plays an important role in strong roping of AA6016 sheets.

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Deep learning methods for roping defect analysis in aluminum alloy sheets: prediction and grading

Hu,

Liu,

et al. 2024

Adv. Manuf.

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Quantification of roping intensity on aluminium sheets by Areal Power Spectral Density analysis

Cited by 10 publications

References 12 publications

Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysis

Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysis

Correlation of Surface Roping with Through-Thickness Microtextures in an AA6xxx Sheet

Deep learning methods for roping defect analysis in aluminum alloy sheets: prediction and grading

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