Development of a predictive model for draw bead restraining force utilizing work of nine and wang

Lévy, Bernard

doi:10.1007/bf02833875

Cited by 43 publications

(13 citation statements)

References 3 publications

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“…While the sheet passes through the drawbead, the yield behavior of the sheet is depicted by the anisotropic function proposed by Barlat et al [21] for the plane stress state as follows: (2) where m is a material coefficient and λ 1 and λ 2 are, respectively, the principal values of the matrices, λ' and λ", represented by Cauchy stress, σ, as follows: (3) and (4) In the above equations, the components of C' and C'' are, respectively, defined as follows:…”

Section: Equivalent Drawbead Modelsmentioning

confidence: 99%

“…After Nine [1,2] carried out a pulling test through the circular drawbead, Wang [3] proposed a mathematical model for a circular drawbead, and Levy [4] introduced the principle of virtual work for predicting drawbead forces. In addition, Triantafyllidis et al [5,6] compared the drawbead forces obtained by analyzing the drawing process with 2-dimensional shell elements with those found by experiment, and Stoughton [7] announced a mathematical model of the drawbead considering various forming parameters.…”

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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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: Equivalent Drawbead Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Equivalent drawbead models for sheet forming simulation

Moon

Lee

et al. 2010

Met. Mater. Int.

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show abstract

“…Using Levy's model as a first approach (Levy (1983); Levy (1985)), Stoughton (1988) has developed an analytical model to preestimate the DBRF. The basic idea from his model was to integrate the deformation work through the sheet thickness and across the drawbead geometry, based on the virtual work principle.…”

Section: Testing With An Analytical Solutionmentioning

confidence: 99%

“…In the present study, Nine's results were used as a part of the validation. Levy (1983) and Levy (1985) developed a semi-empirical procedure to establish a closed formula for DBRF. In his equation, parameters of material properties and geometrical forms of the sheet and the drawbeads were considered.…”

Section: Introductionmentioning

confidence: 99%

A hybrid approach for estimating the drawbead restraining force in sheet metal forming

Duarte¹,

Oliveira²,

Weyler³

et al. 2010

J. Braz. Soc. Mech. Sci. & Eng.

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“…Wang [3] proposed a mathematical model of the drawbead forces for calculating the force required to draw sheet metal past a drawbead of constant cross section. Levy [4] had improved Wang and Nine's study on drawbeads in 1983. A theoretical model based on virtual work principle was proposed by Chen [5] to calculate the restraining force produced by the drawbead located on a stamping die surface.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Influence of Draw Bead Location and Profile in Hemispherical Cup Forming

G.¹,

M.²,

A³

2010

IJET

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Abstract-The quality of sheet metal part is secured by the material flow into the die cavity. Drawbeads are often used in sheet metal forming to restrain the sheet from flowing freely into die cavity. In this paper, finite element method was used to optimize the location of a circular and rectangular drawbeads and analyse the strain and thickness variations during the cup drawing process. DYNAFORM and LS-DYNA, a commercially available explicit FEA code were used to model and analyze the forming process respectively. In simulation, a hemispherical cup of diameter 100mm was considered and simulation studies were carried out for all possible locations of drawbead-, and location which gave minimum Vonmises stress and maximum thickness was taken as the optimized location. Experiments were conducted using a die block of 102mm inner diameter and punch of 100mm diameter on cold rolled steel of thickness 1.02mm. Circular drawbead of specific height was made on the binder surface at the optimized location corresponding groove was machined on the die surface and forming of cup was completed.The experiment was repeated with rectangular drawbead also. Strain and thickness variations were measured for the cup drawing process. The results show good agreement between numerical method and experiment. On comparison, rectangular drawbeads restrain the material more than circular drawbead.Index Terms-Drawbead, LS-DYNA, Plastic strain, Sheet metal forming.

show abstract

Development of a predictive model for draw bead restraining force utilizing work of nine and wang

Cited by 43 publications

References 3 publications

Equivalent drawbead models for sheet forming simulation

Equivalent drawbead models for sheet forming simulation

A hybrid approach for estimating the drawbead restraining force in sheet metal forming

Analysis of Influence of Draw Bead Location and Profile in Hemispherical Cup Forming

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