Experimental analysis and theoretical predictions of the limit strains of a hot-dip galvanized interstitial-free steel sheet

Freitas, M.; Moreira, Luciano Pessanha; Velloso, Renata Garcez

doi:10.1590/s1516-14392013005000015

Cited by 13 publications

(9 citation statements)

References 31 publications

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“…The near plane strain data are also smaller than the FLC 0 value derived from Nakazima's tests, but in this case the difference is smaller compared with the case of the AISI 1050 steel. These results are consistent with the ones obtained by Freitas et al 24 in a hot-dip galvanized IF steel, which were based on the conventional FLC determination (using Marciniak's test). These authors report a high susceptibility of the test to the lubrication conditions.…”

Section: Resultssupporting

confidence: 92%

Uniaxial near plane strain tensile tests applied to the determination of the FLC0 formabillity parameter

Xavier

Plaut

Schön³

2014

Mat. Res.

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An alternative procedure for the determination of the FLC 0 value, the limit strain value corresponding to the plane strain mode of the Forming Limit Curves (FLC), a critical parameter in the sheet formability analysis, is suggested and compared with conventional Nakazima simulation tests. The procedure was tested using two different materials: interstitial-free quality steel (IF) and a spheroidized SAE 1050 steel. The intrinsic tensile test, in a near plane strain state, was performed using a small number of samples, with dimensions suggested by the literature. The results were checked against Nakazima test results using the same materials. The plane strain test was reliable in determining consistent FLC 0 values and should be preferred since it is not affected by the geometric aspects and by friction, which do affect the Nakazima test. The reliability of the FLC 0 values obtained by near plane strain was also corroborated through comparison with literature data.

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Section: Resultssupporting

confidence: 92%

Uniaxial near plane strain tensile tests applied to the determination of the FLC0 formabillity parameter

Xavier

Plaut

Schön³

2014

Mat. Res.

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“…Also, the elastic properties of both steels are defined by the Poisson's ratio ν = 0.29 and Young modulus E = 207,000 MPa. For AISI 1012 steel sheet numerical simulations, the plastic anisotropy was described by Ferron's orthotropic plane-stress yield criterion [8] with the isotropic work-hardening assumption, as detailed elsewhere [5]. Hill's quadratic [9] yield criterion was adopted to describe the plastic anisotropic behavior of BH steel sheet.…”

Section: Resultsmentioning

confidence: 99%

“…are then numerically calculated from the stress and strain states in the homogeneous zone "a". The solution is obtained by rewriting the equilibrium force conditions as a set of two nonlinear equations [5]: are satisfied. Then, the limit strains are obtained as the corresponding accumulated principal strains in the homogeneous zone "a" ( * * ε ε…”

Section: St Brazilian Conference On Materials Science and Engineeringmentioning

confidence: 99%

Elasto-Plastic Modeling of the Limit Strains in Metallic Sheets

Cardoso¹,

Moreira²,

Freitas³

2016

MSF

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In this work, the model of Marciniak and Kuczynski, hereafter referred to as the M-K model, was extended to account for the elastic strains to forecast the Forming Limit Curve (FLC) of metallic sheets. The return mapping algorithm is adopted where an elastic predictor step is performed with the generalized Hooke’s law and the plastic correction step is performed assuming the isotropic work-hardening together with the associated flow rule. The current M-K model predicted quite well both experimental and rigid-plastic results obtained for an IF steel sheet. Also, the principal stresses predicted by the elasto-plastic M-K model provided a good agreement with the experimental Forming Limit Stress Diagram (FLSD) of a Bake-Hardening steel sheet. Therefore, the elastic strains should be taken into account in the modeling of limit strains in metallic sheets, especially in the case of advanced high strength steels for which the Young modulus decreases with the plastic strain.

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“…Thus, it is an intrinsic to find out the process parameter which can lead defect-free product. To evaluate the formability of sheet metal in condition of bi-axial tension, Keeler proposed the idea of the Forming Limit Diagram (FLD) [5][6][7][8] . The Nakajima experiment is an approach to find out the Forming Limit Curve of sheet metal that based on the principle of deformation on blank sheet and combination of a lot kinds of testing specimens that was deformed by a hemispheri-cal punch until detecting the fracture 9 .…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Stamping Speed for Sheet Metal Forming of Aluminum Alloy 5052-H112

Vu²

2021

Sci.Tech.Dev.J.-Eng.Tech.

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Deep drawing is the most advanced sheet metal forming technique. In today’s demanding environment is the global environment and energy saving, the process has been supposed to play a vital role in light-weight component industry. Light-weight, high strength, low density and extreme corrosion aspects must be almost guaranteed in a deep drawn product. However, due to those requirements, thinning and wrinkling and other defects will be increased also. Numerous elements such as blank-holder pressure, punch force, speed of punch, blank shape, thickness variation, surface-to-surface friction coefficient, material characteristic,…influenced to the success of methods as well as the quality of the products. In addition, worldwide manufacturers keep getting the most goods done in less time. Indeed, the increasing of productivity should be also dealt because it proportionally relates to the stamping speed. This paper investigates the influence of punch velocity on deformation behavior of aluminum alloy 5052–H112. Finite Element Method was used to perform Nakajima test at several of punch velocities of specimen widths and monitor fluctuations in magnitude of von Mises stress, the major strain and minor strain. Forming Limit Curve (FLC) was obtained at different velocities and almost uniform. Stretching and sliding across the top of the punch resulted in thinning of sheet metal. Beside this, the action of punch stroke resulted in the production of more von Mises concentrated stress and the largest specimen in widths had shown the peak value of von Mises stress compared with the other specimens at all different velocities. Furthermore, the ratio of the major strain to the minor strain is influenced by the mass of material at the contact area and keeps consistent over the variation in velocities of punch. This will pave the way for future studies of the optimization of the stamping speed in deep drawing.

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Experimental analysis and theoretical predictions of the limit strains of a hot-dip galvanized interstitial-free steel sheet

Cited by 13 publications

References 31 publications

Uniaxial near plane strain tensile tests applied to the determination of the FLC0 formabillity parameter

Uniaxial near plane strain tensile tests applied to the determination of the FLC0 formabillity parameter

Elasto-Plastic Modeling of the Limit Strains in Metallic Sheets

Analysis of the Stamping Speed for Sheet Metal Forming of Aluminum Alloy 5052-H112

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