Characterization of surface defects after flanging of metallic sheets

Port, A. Le; Thuillier, Sandrine; Manach, Pierre‐Yves

doi:10.1016/j.jmatprotec.2011.07.004

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…However, the identified anisotropic parameters result in slightly larger surfaces than the reference one. Nevertheless, these are bounded by the surfaces identified by Zhang et al() and Le Port et al,() using the Hill anisotropic model. This figure illustrates the problem of non‐unique solutions.…”

Section: Resultsmentioning

confidence: 84%

“…Projection of the Yld2004 yield surface in the plane ( σ x x / σ Y (0), σ y y / σ Y (0)) for the previous studies() and for the identified material parameters sets…”

Section: Resultsmentioning

confidence: 99%

“…Projection of the Yld2004 yield surface in the plane ( xx ∕ Y (0), yy ∕ Y (0)) for the previous studies [3,12,32] and for the identified material parameters sets anisotropic parameters result in slightly larger surfaces than the reference one. Nevertheless, these are bounded by the surfaces identified by Zhang et al [3] and Le Port et al, [32] using the Hill anisotropic model. This figure illustrates the problem of non-unique solutions.…”

Section: Figure 15mentioning

confidence: 87%

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Design of heterogeneous mechanical tests: Numerical methodology and experimental validation

Aquino

Andrade‐Campos

Martins

et al. 2019

Strain

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Standard material parameters identification strategies for constitutive equations generally use an extensive number of classical tests for collecting the required experimental data. Recently, new specimen geometries for heterogeneous tests were designed to enhance the richness of the strain field and capture supplementary strain states using full-field measurement techniques. The butterfly specimen is an example of such a geometry, designed through a numerical optimization procedure where an indicator capable of evaluating the heterogeneity and the richness of strain information is used. The aim of this work is to experimentally validate the heterogeneous butterfly mechanical test in the parameter identification framework. Blanks of mild steel DC04 are cut with the butterfly geometry, and specific grips are designed. Tests are performed with Digital Image Correlation technique, and a Finite Element Model Update inverse strategy is used for the parameter identification, as well as the calculation of the indicator. The identification strategy is accomplished with the data obtained from the experimental tests, and the results are compared with quasi-homogeneous tests. KEYWORDSheterogeneous tests, mechanical behaviour, parameters identification, shape design optimization, sheet metal Strain. 2019;55:e12313.wileyonlinelibrary.com/journal/str

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Section: Resultsmentioning

confidence: 84%

“…Projection of the Yld2004 yield surface in the plane ( σ x x / σ Y (0), σ y y / σ Y (0)) for the previous studies() and for the identified material parameters sets…”

Section: Resultsmentioning

confidence: 99%

Section: Figure 15mentioning

confidence: 87%

See 1 more Smart Citation

Design of heterogeneous mechanical tests: Numerical methodology and experimental validation

Aquino

Andrade‐Campos

Martins

et al. 2019

Strain

Self Cite

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“…2 shows the blank used in the analysis. It is a laboratory scale profile which assimilates a front fender part [5] adjoining the head light, and similar to the one used in [3]. Fig.…”

Section: Methodsmentioning

confidence: 99%

“…By locally affecting the deformation mode during flanging, the springback mechanism that leads to the overcrown is mitigated. Le Port et al [3] investigates the surface defects of automobile door upper corner in stretch-flanging with concave depression of small amplitude over the convex shape of the part. Their result shows that the flanging height does not influence significantly the surface defect geometry whereas the flanging radius and the corner radius modify the defect depth.…”

Section: Introductionmentioning

confidence: 99%

Compensation of Contour Distortion in Stretch-Flanging Metal Sheets

Lin

et al. 2020

KEM

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Stretch-flanging commonly appears at the concave edge of the panel part. Sheet thickness tends to decrease at the center of flange attributed to the outflow of metal flow, and hence causes a radial shrinking of the material. This shrinking pulls the ends of the flange and makes the adjacent surface overcrown. In this paper the effect of punch profiles on a laboratory scale profile, which assimilates the front fender part adjoining the head light, was investigated for the stretch-flanging process. Both the concave and convex punch profiles were considered. SUS 304 stainless steel sheet of 0.6 mm thick was used as the model metal sheet. DynaForm software was used in simulating the stretch flanging process and followed by experimental verification. The results show that a depression angle of 4.4° and an elevation angle 2.6° can produce lowest crown-contour for the concave and convex punches, respectively. The concave punch also causes less thinning at the flange center which makes it a favorable solution than that of the convex punch.

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Non-linear Correlation Between Uniaxial Tensile Properties and Shear-Edge Hole Expansion Ratio

Paul

2014

J. of Materi Eng and Perform

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Stretch flanging of steel sheets is an important formability issue for automobile industry. Finite element simulation study confirms that the edge of the hole deforms in a uniaxial tensile manner during the hole expansion process. To understand the effect of various tensile properties on hole expansion ratio, current experimental data and collected data from published work have been used. Yield stress, ultimate tensile stress, coefficient of normal anisotropy, total elongation, and post uniform elongation are closely related to hole expansion ratio. A non-linear relationship between hole expansion ratio and tensile properties (ultimate tensile stress, coefficient of normal anisotropy, and total elongation) is developed in the present investigation.

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Characterization of surface defects after flanging of metallic sheets

Cited by 12 publications

References 9 publications

Design of heterogeneous mechanical tests: Numerical methodology and experimental validation

Design of heterogeneous mechanical tests: Numerical methodology and experimental validation

Compensation of Contour Distortion in Stretch-Flanging Metal Sheets

Non-linear Correlation Between Uniaxial Tensile Properties and Shear-Edge Hole Expansion Ratio

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