Expert drawbead models for finite element analysis of sheet metal forming processes

Keum, Y.T.; Kim, J.H.; Ghoo, Bonyoung

doi:10.1016/s0020-7683(00)00342-5

Cited by 25 publications

(14 citation statements)

References 8 publications

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“…The vertical component of the friction force, B, acting on the upper drawbead die during the pulling through of an elliptical/circular drawbead can be obtained as follows [14]: (13) where ρ is the loading angle of pressure distribution acting on the drawbead surface, F I is the tensile force when ρ=0, 2θ is the contact angle between the sheet and the upper die, and µ is the friction coefficient.…”

Section: Elliptical/circular Drawbeadmentioning

confidence: 99%

“…Assuming the rigid perfectly plastic behavior of the sheet and quoting Dieter's estimation [23] of a force required to bend a sheet length L about a radius R, F b (R): (14) where σ 0 , t, and θ are sheet yield stress, sheet thickness, and a half of the contact angle, respectively. Now, the recovery force F e caused by the springback is calculated by considering the bending forces before and after springback as follows: (15) where R i and R f are the sheet radii before and after springback, respectively.…”

Section: Elliptical/circular Drawbeadmentioning

confidence: 99%

“…Meinder et al [10] introduced a 2-dimensional equivalent drawbead model based on a penalty constraint method in a contact algorithm, and Lee et al [11,12] calculated drawbead forces considering an isotropic-kinematic hardening rule and anisotropic constitutive equations. Recently, Keum et al [13][14][15][16] announced experiments for determining drawbead forces and drawbead models for finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Equivalent drawbead models for sheet forming simulation

Moon

Lee

et al. 2010

Met. Mater. Int.

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Equivalent drawbead models associated with drawbead types, with which the geometrical modeling of drawbeads can be replaced in a numerical simulation of the stamping process, are introduced. The accuracy of the equivalent drawbead models rapidly computing the drawbead restraining and opening forces, based on the hybrid membrane/bending method accommodating Barlat's anisotropic yield function for the plane stress state and the modified Chaboche model considering the Bauschinger effect and transient behavior under the plane strain condition, is verified by comparing the equivalent drawbead forces with those obtained from the finite element simulation. Moreover, the drawbead forces computed by equivalent drawbead models are employed in a finite element simulation of the automotive fender stamping process, from which the effectiveness and applicability of equivalent drawbead models are observed by comparing strains and draw-ins with those measured in the tryout panel.

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Section: Elliptical/circular Drawbeadmentioning

confidence: 99%

Section: Elliptical/circular Drawbeadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Equivalent drawbead models for sheet forming simulation

Moon

Lee

et al. 2010

Met. Mater. Int.

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“…Sunaga et al [7] proposed an efficient method to determine the DBRF, which was calculated only from the contact angle between the sheet and drawbead, for arbitrary drawbead dimensions without real and experiment. Keum et al [8] proposed expert drawbead model which provides the drawing characteristics of the drawbead used in the finite-element analysis of sheet metal forming process to overcome the limitations of previous equivalent drawbead model positioned in the direction of normal to the sheet movement. Naceur et al [9] presented an optimization procedure of drawbead restraining forces in order to improve the sheet metal formability in deep drawing process.…”

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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“…several decades [1][2][3][4]. Recent researches have been focused on the optimum die design incorporated with prediction of DBRF.…”

Section: Introductionmentioning

confidence: 99%

Simulation-based prediction model of the draw-bead restraining force and its application to sheet metal forming process

Bae

Song

Huh

et al. 2007

Journal of Materials Processing Technology

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Draw-bead is applied to control the material flow in a stamping process and improve the product quality by controlling the draw-bead restraining force (DBRF). Actual die design depends mostly on the trial-and-error method without calculating the optimum DBRF. Die design with the predicted value of DBRF can be utilized at the tryout stage effectively reducing the cost of the product development. For the prediction of DBRF, a simulation-based prediction model of the circular draw-bead is developed using the Box-Behnken design with selected shape parameters such as the bead height, the shoulder radius and the sheet thickness. The value of DBRF obtained from each design case by analysis is approximated by a second order regression equation. This equation can be utilized to the calculation of the restraining force and the determination of the draw-bead shape as a prediction model. For the evaluation of the prediction model, the optimum design of DBRF in sheet metal forming is carried out using response surface methodology. The suitable type of the draw-bead is suggested based on the optimum values of DBRF. The prediction model of the circular draw-bead proposes the design method of the draw-bead shape. The present procedure provides a guideline in the tool design stage for sheet metal forming to reduce the cost of the product development.

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Expert drawbead models for finite element analysis of sheet metal forming processes

Cited by 25 publications

References 8 publications

Equivalent drawbead models for sheet forming simulation

Equivalent drawbead models for sheet forming simulation

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

Simulation-based prediction model of the draw-bead restraining force and its application to sheet metal forming process

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