Sheet-metal forming

Mellor, Phil

doi:10.1179/imtr.1981.26.1.1

Cited by 8 publications

(3 citation statements)

References 60 publications

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“…It consists of deformation processes in which a flat metal blank is shaped by tools or dies under the action of biaxial stretching, deep drawing and bending deformation modes to produce the desired product or piece without ruptures or defects. The main variables affecting the process are: the material elastic and plastic behavior of deformation region, blank material properties before forming, interaction between tools and workpiece, tooling, properties of the final product, machine tool and the production processes [2]. The main problems occurring in sheet metal forming are local necking, shear fracture, buckling, wrinkling, shape distortion, loose metal and undesirable surface textures or defects.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Simulation Study of Deep Drawing Testing and Experimental Results of Steel Sheets, Using a Comercial Software

Bressan

Cieto²,

Vieira³

et al. 2010

Int J Mater Form

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Present work examines the accuracy of numerical simulation results of deep drawing testing of steel sheets through employing the commercial finite element software AutoForm to reproduce the punch force versus displacement. Numerical simulation is nowadays a modern engineering practice for sheet metal product and tooling design developments, using the finite element method. Historically, sheet metal formability has been assessed by tensile testing and biaxial stretching such as the Erichsen simple test. Lately, the concept of experimental Forming Limit Curve for strains, FLC, and the numerical simulations were developed to evaluate sheet metal formability and its forming operations by predicting the onset of local necking and fracture. In the present work, five types of steel sheets and one aluminium alloy AA6022 sheet were employed in the deep drawing tests with the same flat punch and die to obtain the experimental results of force versus punch displacement which were presented by De La Cour. The steel sheets with the same blank diameter utilized in the simulation and experimental testing were DQSK, BH33, HSLA50, TRIP600 and DP600 which different thickness varied from 0.783 mm to 1.601 mm. The experimental curve of punch force versus displacement were compared with the numerical simulation results by AutoForm, using 3D shell elements, hardening law defined by the effective stress n o ) 1 ( ε β + σ = σ and friction coefficient of 0.10 between the blank hold and blank and 0.075 between blank and die. The average experimental hardening law curve for tensile tests at 0 o , 45 o and 90 o and the Hill´s 1948 yield criteria, assuming isotropic plasticity, were used to numerically simulate the plasticity behavior during the deep drawing of steel and aluminium sheets. The simulated curves are situated above the experimental points of punch load for all materials. The calculated error varied from 2% to 8.5% for points near the maximum load. The principal characteristics of reliable software for numerical simulation of deep drawing process are also discussed, considering the actual tendency to use software in the design of dies and sheet metal manufacturing process analysis.

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Section: Introductionmentioning

confidence: 99%

A Numerical Simulation Study of Deep Drawing Testing and Experimental Results of Steel Sheets, Using a Comercial Software

Bressan

Cieto²,

Vieira³

et al. 2010

Int J Mater Form

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“…Several formability tests have been developed [5][6][7]that simulate drawing and/or stretching conditions that exist in press forming operations. Some of these predictive tests are Erichsen test, Olsen test and Fukui cup test [8]. For more complete information on formability, Forming Limit Diagrams (FLDs) are widely used.…”

Section: Introductionmentioning

confidence: 99%

Review of Formability in Relation to Texture

Limbadri¹,

Gangadhar²,

Ram³

et al. 2015

Materials Today: Proceedings

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“…Hill's [2] quadratic yield function is a generalization of the isotropic von Mises yield function for anisotropic materials, and is widely used for analysis of orthotropic metals. However, Hill's yield function has some limitations particularly for aluminum alloys [3,4]. More advanced, non-quadratic anisotropic yield criteria have been developed by many researchers [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Different Constitutive Models in Sheet Metal Forming

Uçan

Darendelıler

2013

KEM

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The effects of different constitutive models in sheet metal forming are investigated by considering the cylindrical and square cup drawing and V-bending processes. Numerical analyses are performed by employing eight different constitutive models. These are elastic plastic constitutive model with isotropic hardening, elastic plastic constitutive model with kinematic hardening, elastic plastic constitutive model with combined hardening, power law isotropic plasticity, piecewise linear isotropic plasticity, three-parameter Barlat, anisotropic plasticity and transversely anisotropic elastic plastic models. The simulations are performed for three different materials, St12 steel, Al-5182 aluminum and stainless steel 409 Ni, by using a commercial finite element code. A number of experiments are carried out and the experimental and analytical results are utilized to evaluate the results of simulations.

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Sheet-metal forming

Abstract: Mellor: Sheet-metal forming prelubrication of the sheet, and the ways in which the sheet is fed and guided into the press. 7

Cited by 8 publications

References 60 publications

A Numerical Simulation Study of Deep Drawing Testing and Experimental Results of Steel Sheets, Using a Comercial Software

A Numerical Simulation Study of Deep Drawing Testing and Experimental Results of Steel Sheets, Using a Comercial Software

Review of Formability in Relation to Texture

Comparison of Different Constitutive Models in Sheet Metal Forming

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