An experimental analysis of drawing characteristics of a dual-phase steel through a round drawbead

Livatyalı, Haydar; Fırat, Mehmet; Gürler, Burak; Özsoy, Murat

doi:10.1016/j.matdes.2009.08.030

Cited by 12 publications

(11 citation statements)

References 7 publications

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“…The values of shear stress for Hill's yield functions are considerably lower than other models and are more uniform, especially in the middle part of the analysed width of the sample. The dominant factors in determining both restraint force and blank thinning of dual-phase steel are bead penetration, flow stress and strain hardening [24]. In contrast, the effects of anisotropy and strip drawing direction with respect to the rolling direction are found to be relatively less influential.…”

Section: Discussion Of Numerical Resultsmentioning

confidence: 87%

Frictional Conditions of AA5251 Aluminium Alloy Sheets Using Drawbead Simulator Tests and Numerical Methods

Trzepieciński¹,

Lemu²

2014

SV-JME

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This article presents research results on the effect of sheet metal surface roughness, lubricant conditions and sample orientation on the value of friction coefficient in the drawbead region of sheet metal-forming processes. Aluminium alloys with different temper conditions were used as test materials. The experimental results have ascertained several relationships showing the effect of surface profile and lubrication on the value of the friction coefficient. Based on experimental measurements, it may be concluded that the sample orientation and the lubrication conditions are crucial variables influencing the value of the coefficient of friction. Furthermore, a numerical model of the drawbead has been created in Msc.MARC Mentat software, and several simulations have been performed to study the stress/strain state in stretched sample during drawbead simulator tests. Both isotropic and anisotropic material models were used in the simulations taking into account the sample orientation with respect to the rolling direction of the sheet.

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Section: Discussion Of Numerical Resultsmentioning

confidence: 87%

Frictional Conditions of AA5251 Aluminium Alloy Sheets Using Drawbead Simulator Tests and Numerical Methods

Trzepieciński¹,

Lemu²

2014

SV-JME

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“…More efficient fuel consumption could be accomplished by reducing car body weight. Higher crash worthiness is required at the same time for new cars, and for this purpose, advanced lightweight materials have been intensively developed . Dual phase (DP) steels belong to advanced high strength (AHS) steel grade, which is very important for car structural components.…”

Section: Introductionmentioning

confidence: 99%

“…Such steel grade as DP steel has been widely applied because it exhibits a light‐weight design, high strength with high fracture strain, and accordingly good formability . The advantageous mechanical properties of DP steels for the sheet metal forming process were their continuous yielding behavior and high work‐hardening rate, which are the results of their microstructure characteristics . The microstructure of the DP steels basically consisted of martensite islands embedded in a ferritic matrix.…”

Section: Introductionmentioning

confidence: 99%

Influences of Microstructure Characteristics on Forming Limit Behavior of Dual Phase Steels

Sirinakorn

Sodjit

Uthaisangsuk

2015

steel research int.

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In the automotive sector, dual phase (DP) steel grades have been increasingly used for various car body parts due to their good combination of strength and formability. To control mechanical and fracture characteristics of the DP steels, effects of martensitic phase fraction, morphology, and phase distribution must be understood. In this work, DP steel sheets with different martensitic phase fractions and ferritic grain sizes were produced through the intercritical annealing process. Likewise, FE simulations of 2D representative volume elements (RVEs) based on real micrograph were performed for all generated DP microstructures. Flow behaviors of single individual phases in the DP steels were described by a dislocation theory and local chemical compositions. Calculated stress–strain responses were verified with experimental results from tensile tests. Subsequently, stretch‐forming tests under different states of stress using the Nakajima samples were carried out for the examined DP steels. Micromechanics RVE models were then applied to predict failure occurrences in the DP microstructures by considering plastic strain instability. Influences of morphologies and properties of constituent phases on localization due to incompatible deformation between martensite and ferrite were discussed with regard to governing stress states.

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“…Han et al [10] suggested a computational inverse technique to identify geometric parameters of drawbead using a NN combined with GA. The sheet drawing characteristics of a dual-phase steel (DP600) through a round drawbead were determined by Livatyali et al [11] using strip drawing tests. A new design methodology for complex sheet metal stamping processes was presented by Ingarao and Lorenzo [12].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Sheet Drawing Characteristics with Square Drawbead Elements Using Response Surface Methodology

2015

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Drawbeads are often used in the sheet metal forming processes to provide a better control of the material flow into the die cavity. The drawbead restraint force (DBRF) and the exit thickness are two important sheet drawing characteristics to be determined for the selection and installation of the drawbead elements. This study presents the effects of drawbead geometry and sheet material on drawbead restraining force and thinning. Mathematical correlation between the drawbead geometry, sheet material and drawing characteristics was investigated by using Response Surface Methodology (RSM), which is a global approximation method ideally suited for solving highly nonlinear optimization problems. The proposed response surface model for DBRF and thinning showed a good correlation with the experimental data available in the literature. RSM could be considered as an alternative and practical technique to evaluate the sheet drawing characteristics. The method can also be applied to other sheet metal forming issue.

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An experimental analysis of drawing characteristics of a dual-phase steel through a round drawbead

Cited by 12 publications

References 7 publications

Frictional Conditions of AA5251 Aluminium Alloy Sheets Using Drawbead Simulator Tests and Numerical Methods

Frictional Conditions of AA5251 Aluminium Alloy Sheets Using Drawbead Simulator Tests and Numerical Methods

Influences of Microstructure Characteristics on Forming Limit Behavior of Dual Phase Steels

Prediction of Sheet Drawing Characteristics with Square Drawbead Elements Using Response Surface Methodology

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