Analysis of roping in an AA6111 T4P automotive sheet in 3D deformation states

Shi, Yucai; Jin, H.; Wu, Peidong; Lloyd, D. J.

doi:10.1016/j.actamat.2016.11.028

Cited by 23 publications

(16 citation statements)

References 18 publications

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“…Different comparison strategies were used to try to assess roping magnitude. As an example, Shi et al [ 8 ] developed a three-dimensional crystal plasticity model based on finite elements to simulate sheet surface roughening after different tensile strain levels. In particular, they assessed the role of the banding of Cube and Goss texture components on roping in AA6111 sheets by examining the roughness profiles given by their model.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

2020

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Roping or ridging is a visual defect affecting the surface of ferritic stainless steels, assessed using visual inspection of the surfaces. The aim of this study was to quantify the morphological signature of roping to link roughness results with five levels of roping identified with visual inspection. First, the multiscale analysis of roughness showed that the texture aspect ratio Str computed with a low-pass filter of 32 µm gave a clear separation between the acceptable levels of roping and the non-acceptable levels (rejected sheets). To obtain a gradation description of roping instead of a binary description, a methodology based on the use of the autocorrelation function was created. It consisted of several steps: a low-pass filtering of the autocorrelation function at 150 µm, the segmentation of the autocorrelation into four stabilized portions, and finally, the computation of isotropy and the root-mean-square roughness Sq on the obtained quarters of function. The use of the isotropy combined with the root-mean-square roughness Sq led to a clear separation of the five levels of roping: the acceptable levels of roping corresponded to strong isotropy (values larger than 10%) coupled with low root-mean-square roughness Sq. Both methodologies can be used to quantitatively describe surface morphology of roping in order to improve our understanding of the roping phenomenon.

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Section: Introductionmentioning

confidence: 99%

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

2020

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“…Deformation-induced surface roughening is a common feature for many materials (Raabe et al, 2003;Stoudt et al, 2011;Yoshida, 2014;Shi et al, 2017;Ma et al, 2019a,b). Being flat in the undeformed state, the material free surface roughens under deformation in the absence of external forces applied across its plane.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, roughening develops throughout all length scales from micro to macro (Anongba et al, 1993;Raabe et al, 2003) with roughness characteristics depending on many factors (crystal lattice, grain size and shape, texture, interface geometry, loading conditions, mechanical properties, etc.) (Raabe et al, 2003;Stoudt et al, 2011;Yoshida, 2014;Shi et al, 2017;Ma et al, 2019a,b;Solhjoo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…For the most part, deformation-induced roughening is thought to be undesirable feature impairing cosmetic and functional material properties, such as reflectivity, lubricant transport, wear resistance, yield strength and the like (Raabe et al, 2003;Stoudt et al, 2011;Yoshida, 2014;Shi et al, 2017;Ma et al, 2019a,b;Cinat et al, 2020;Joe et al, 2020;Ozaki et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Aspects of Deformation-Induced Surface Roughening in the Presence of Inclusions in a Subsurface Layer. Numerical Modeling

et al. 2020

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The mechanical aspects of deformation-induced surface roughening inherent in microstructural inhomogeneity are studied numerically using single inclusion models. Three-dimensional finite-element calculations of uniaxial tension are performed for a set of single inclusion models where a cubic-shaped inclusion is embedded into a homogeneous matrix. The inclusion-to-surface distance, tilt angle about the axis of tension, and the ratio between the matrix and inclusion elastic-plastic properties are varied in different combinations to study the effects which these parameters have on the development of out-of-plane surface displacements under uniaxial tension. It has been shown that all stress and strain tensor components in the vicinity of inclusions take on non-zero values, including those directed across the load axis. Thus, the free surface becomes rough under the action of internal forces originated from the inhomogeneous stress-strain fields. Some illustrative examples of surface roughening under uniaxial tension are shown for multiple ellipsoidal inclusions periodically arranged in a subsurface layer of an elastic-plastic material.

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“…Plastic deformation, impact toughness and crack resistance of materials can be enhanced significantly under loading applied after the DNP [21,22,23]. In addition, with further cyclic loading it is also possible to extend the fatigue life of materials [24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading

et al. 2019

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It was shown previously that cyclic loading can be used to extend the fatigue life of sheet plastic materials subjected to the preliminary impact-oscillatory loading. This type of loading causes dynamic non-equilibrium processes (DNP) in materials, which lead to the formation of dissipative structures in materials and on their surface. The density of these dissipative structures is less than that of the base metal. In this paper, the results of investigations into the relief and hardness of surface layers modified by impact-oscillatory loading are analyzed on the example of five structural materials. The signs of a regular, orderly system of microextrusions formed on flat surfaces of all materials due to DNP are considered along with the alignment of roughness parameters Rz and Ra of relief profiles. The effect of impact-oscillatory loading is one of the main causes that lead to the extension of the fatigue life of materials.

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Analysis of roping in an AA6111 T4P automotive sheet in 3D deformation states

Cited by 23 publications

References 18 publications

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

Mechanical Aspects of Deformation-Induced Surface Roughening in the Presence of Inclusions in a Subsurface Layer. Numerical Modeling

Variation of Relief Topography and Hardness of Surface Layers of Materials Due to Impact-Oscillatory Loading

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