Ebook: Modelling of Metal Forming Processes: Proceedings of the Euromech 233 Colloquium, Sophia Antipolis, France, August 29–31, 1988

The physical modelling of metal forming processes has been widely used both in University and in Industry for many years. Relatively simple numerical models, such as the Slab Method and the Upper Bound Method, were first used and many such models are implemented in the industry for practical design or regulation of forming processes. These are also under investigation in the University, mainly for treat­ models ments which require low cost calculations or very fast answers for on-line integration. More recently, sophisticated numerical methods have been used for the simulation of metal flow during forming operations. Since the early works in 1973 and 1974, mainly in U. K. and U. S. A. , the applications of the finite element method to metal processing have been developed in many laboratories all over the world. Now the numerical approach seems to be widely re­ cognized as a powerful tool for comprehension oriented studies, for predic­ ting the main technological parameters, and for the design and the optlmi­ zation of new forming sequences. There is also a very recent trend for the introduction of physical laws in the thermo-mechanical models, in order to predict the local evolution of internal variable representing the micro­ structure of the metal. To day more and more practicians of the Industry are asking for compu­ ter models for design of their forming processes.

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Content:
Front Matter....Pages i-ix
Front Matter....Pages 1-1
The Description of Yield Surfaces for Cold Prestressed Metals with the Hypothesis of the Isotropy Centers Translation....Pages 3-10
Constitutive Description and Numerical Approach in Modelling for Metal Forming Processes....Pages 11-18
Simulation of Impact Tension Deformation of Metals by Fem....Pages 19-26
Finite Elements Analysis of Large Plastic Deformation in Metals....Pages 27-36
Modelling of Structure Formation and Relation to Mechanical Properties of Nodular Cast Iron....Pages 37-46
Front Matter....Pages 47-47
H and P Mesh Refinement in the Metal-Forming F.E.M. Analysis....Pages 49-56
A Mixed Eulerian-Lagrangian Finite Element Method For Simulation Of Thermo-Mechanical Forming Processes....Pages 57-64
A Method to Reduce Cost of Mesh Deformation in Eulerian-Lagrangian Formulation....Pages 65-74
Error Control, Mesh Updating Schemes and Automatic Adaptive Remeshing for Finite Element Analysis of Unsteady Extrusion Processes....Pages 75-83
Modelling of Frictional Tool Surfaces in Finite-element Metalforming Analyses....Pages 85-92
Numerical Modelling of Friction for Metal Forming Processes....Pages 93-99
Front Matter....Pages 101-101
Modelling of Deep Drawing Processes By Model Testing and Dimensional Analysis....Pages 103-110
A Finite Difference Model as A Basis for Developing New Constitutive Equations for the Sheet Forming Process....Pages 111-121
Influence of Anisotropy in Sheet Metal Forming....Pages 123-130
Experience with Explicit and Implicit Finite Element Programs for Sheet Forming Analysis....Pages 131-138
Influence of Thickness and Curvature on the Formability of Metal Sheets....Pages 139-146
Experimental Analysis of an Axisymmetric Deep Drawing....Pages 147-154
Computer Aided Design of a Progressive Die....Pages 155-162
Finite Element Analysis Of Sheet Metal Forming Problems Using A Viscous Voided Shell Formulation....Pages 163-178
Time Stepping Schemes for the Numerical Analysis of Superplastic Forming of Thin Sheet....Pages 179-186
Front Matter....Pages 101-101
Thin Sheet Forming Numerical Analysis With A Membrane Approach....Pages 187-196
Front Matter....Pages 197-197
Comparison of Simulation Techniques and Industrial Data in Forging Applications....Pages 199-205
Finite Element Calculation of Hot Forging with Continuous Remeshing....Pages 207-216
Finite Element Applications in Forming Billet and P/M Preforms....Pages 217-225
Three Dimensional Finite Element Calculation of the Forging of a Connecting Rod....Pages 227-236
Numerical Identification of Forging Parameters....Pages 237-244
Identification of Defect Locations in Metal Forming Using a Personal-Computer-Oriented Finite Element Method....Pages 245-252
Modelling of Metal Forming Processes....Pages 253-259
Numerical Analysis of Cold Drawing of Tubes....Pages 261-268
Front Matter....Pages 269-269
A Three Dimensional Thermomechanical Analysis of Steady Flows in Hot Forming Processes. Application to Hot Flat Rolling and Hot Shape Rolling....Pages 271-279
Thermal-Mechanical Modelling for Hot Rolling: Experimental Substantiation....Pages 281-288
Simulation of Rolling by Plasticine....Pages 289-294
Simulation of Profile and Flatness in the Cold Rolling of Steel Strip....Pages 297-304
Application of a Mathematical Model for The Cold Rolling Process on Six-High Mills....Pages 305-312
Analysis of Plane Strain Cold Rolling Using a Flow Function and the Weighted Residuals Method....Pages 313-320
Metallographic Verification of Computer Modelling of Hot Rolling....Pages 321-328
Finite Element Analysis of Two-Roll Hot Piercing....Pages 329-336
Modelling the Mechanics of the Longitudinal Tube Rolling Process....Pages 337-345

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Content:
Front Matter....Pages i-ix
Front Matter....Pages 1-1
The Description of Yield Surfaces for Cold Prestressed Metals with the Hypothesis of the Isotropy Centers Translation....Pages 3-10
Constitutive Description and Numerical Approach in Modelling for Metal Forming Processes....Pages 11-18
Simulation of Impact Tension Deformation of Metals by Fem....Pages 19-26
Finite Elements Analysis of Large Plastic Deformation in Metals....Pages 27-36
Modelling of Structure Formation and Relation to Mechanical Properties of Nodular Cast Iron....Pages 37-46
Front Matter....Pages 47-47
H and P Mesh Refinement in the Metal-Forming F.E.M. Analysis....Pages 49-56
A Mixed Eulerian-Lagrangian Finite Element Method For Simulation Of Thermo-Mechanical Forming Processes....Pages 57-64
A Method to Reduce Cost of Mesh Deformation in Eulerian-Lagrangian Formulation....Pages 65-74
Error Control, Mesh Updating Schemes and Automatic Adaptive Remeshing for Finite Element Analysis of Unsteady Extrusion Processes....Pages 75-83
Modelling of Frictional Tool Surfaces in Finite-element Metalforming Analyses....Pages 85-92
Numerical Modelling of Friction for Metal Forming Processes....Pages 93-99
Front Matter....Pages 101-101
Modelling of Deep Drawing Processes By Model Testing and Dimensional Analysis....Pages 103-110
A Finite Difference Model as A Basis for Developing New Constitutive Equations for the Sheet Forming Process....Pages 111-121
Influence of Anisotropy in Sheet Metal Forming....Pages 123-130
Experience with Explicit and Implicit Finite Element Programs for Sheet Forming Analysis....Pages 131-138
Influence of Thickness and Curvature on the Formability of Metal Sheets....Pages 139-146
Experimental Analysis of an Axisymmetric Deep Drawing....Pages 147-154
Computer Aided Design of a Progressive Die....Pages 155-162
Finite Element Analysis Of Sheet Metal Forming Problems Using A Viscous Voided Shell Formulation....Pages 163-178
Time Stepping Schemes for the Numerical Analysis of Superplastic Forming of Thin Sheet....Pages 179-186
Front Matter....Pages 101-101
Thin Sheet Forming Numerical Analysis With A Membrane Approach....Pages 187-196
Front Matter....Pages 197-197
Comparison of Simulation Techniques and Industrial Data in Forging Applications....Pages 199-205
Finite Element Calculation of Hot Forging with Continuous Remeshing....Pages 207-216
Finite Element Applications in Forming Billet and P/M Preforms....Pages 217-225
Three Dimensional Finite Element Calculation of the Forging of a Connecting Rod....Pages 227-236
Numerical Identification of Forging Parameters....Pages 237-244
Identification of Defect Locations in Metal Forming Using a Personal-Computer-Oriented Finite Element Method....Pages 245-252
Modelling of Metal Forming Processes....Pages 253-259
Numerical Analysis of Cold Drawing of Tubes....Pages 261-268
Front Matter....Pages 269-269
A Three Dimensional Thermomechanical Analysis of Steady Flows in Hot Forming Processes. Application to Hot Flat Rolling and Hot Shape Rolling....Pages 271-279
Thermal-Mechanical Modelling for Hot Rolling: Experimental Substantiation....Pages 281-288
Simulation of Rolling by Plasticine....Pages 289-294
Simulation of Profile and Flatness in the Cold Rolling of Steel Strip....Pages 297-304
Application of a Mathematical Model for The Cold Rolling Process on Six-High Mills....Pages 305-312
Analysis of Plane Strain Cold Rolling Using a Flow Function and the Weighted Residuals Method....Pages 313-320
Metallographic Verification of Computer Modelling of Hot Rolling....Pages 321-328
Finite Element Analysis of Two-Roll Hot Piercing....Pages 329-336
Modelling the Mechanics of the Longitudinal Tube Rolling Process....Pages 337-345
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