Application of an expert drawbead model to the finite element simulation of sheet forming processes

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

doi:10.1016/s0924-0136(01)00501-5

Cited by 14 publications

(10 citation statements)

References 4 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%

“…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%

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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: Elliptical/circular Drawbeadmentioning

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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“…According to the theory put forth by Keum et al (2001), therefore, the tensile force in region ab is given as follows:…”

Section: Theorymentioning

confidence: 99%

A new experimental test apparatus for angle binder draw bead simulations

Smith

Zhou

et al. 2009

Journal of Materials Processing Technology

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“…Cao and Boyce 10 showed that the restraining force reached its steady state when a part of the sheet was pulled entirely through the drawbead with their finite element simulations. More recently, Keum et al 11 proposed expert drawbead model which provided 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. Meinders 12 and Carleer et al 13 used the success of plain-strain numerical models in the analysis of sheet metal deformation both in transient and steady-state conditions when representative test conditions were simulated with the FEM.…”

Section: Introductionmentioning

confidence: 99%

Drawbead geometric parameters using an improved equivalent model and PSO-BP neural network

Xie

Xiong

Zhuo

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part L:

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To improve the simulation accuracy in sheet metal forming, an improved equivalent drawbead restraining force model is proposed considering the offset of the neutral layer and Bauschinger effect. It is validated with Nine's experimental data. BP neural network is optimized by the regularization and pruning theory to decrease neural network redundancy. The weights and threshold values of BP network are optimized by dynamic Particle Swarm Optimization (PSO) algorithm to reduce the possibility of local values. The surrogate mapping model of input-output variables is obtained from the improved PSO-BP model. The fender from NUMISHEET'93 is selected as case study. The main factors are sampled making use of Latin hypercube. The Latin hypercube sampling is optimized by simulated annealing algorithm. Based on the improved PSO-BP neural network, the metamodel between drawbead forces and forming objectives is established. Based on the multi-objective PSO optimization method, the mapping model is optimized to obtain the optimum drawbead restraining forces. The inverse model of drawbead is established based on the proposed drawbead force model to obtain its geometric parameters. The actual drawbeads based on the inversed parameters are simulated to verify the feasibility of the method. The results show that proposed method can significantly improve the forming quality.

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Application of an expert drawbead model to the finite element simulation of sheet forming processes

Cited by 14 publications

References 4 publications

Equivalent drawbead models for sheet forming simulation

Equivalent drawbead models for sheet forming simulation

A new experimental test apparatus for angle binder draw bead simulations

Drawbead geometric parameters using an improved equivalent model and PSO-BP neural network

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