Numerical Study of Metal Forming Simulation Using Elasto-Plastic and Rigid-Plastic Meshfree Analysis

Volume 2: Computer Technology ◽

10.1115/pvp2005-71006 ◽

2005 ◽

Cited By ~ 1

Author(s):

Young H. Park

Keyword(s):

Metal Forming ◽

Reproducing Kernel ◽

Numerical Study ◽

Plastic Material ◽

Meshfree Method ◽

Material Model ◽

Reproducing Kernel Particle Method ◽

Rigid Plastic ◽

Plastic Model ◽

Forming Simulation

In this paper, material processing simulation is carried out using a meshfree method. The domain of the workpiece is discretized using the Lagrangian Reproducing Kernel Particle Method (RKPM) where no external meshes are used. The meshfree method is formulated for elasto-plastic material model as well as rigid-plastic model. For elasto-plastic model, a finite plasticity theory is formulated based on the multiplicative decomposition to handle large deformation problems. A rigid-plastic material model is also employed using flow formulation based on the assumption that elastic effects are insignificant in the metal forming operation. A comparative study between elasto-plastic and rigid-plastic RKPM methods was conducted to demonstrate consistency of the results from elasto-plastic and rigid-plastic simulations for a metal forming application.

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Rigid-Plastic Meshfree Method for Metal Forming Simulation

Computer Technology and Applications ◽

10.1115/pvp2003-1907 ◽

2003 ◽

Cited By ~ 3

Author(s):

Young H. Park

Keyword(s):

Metal Forming ◽

Plastic Material ◽

Meshfree Method ◽

Large Plastic Deformation ◽

Rigid Plastic ◽

Mesh Distortion ◽

Forming Simulation ◽

Rigid Plastic Material ◽

Plastic Analysis ◽

Main Variable

In this paper, material processing simulation is carried out using a meshfree method. With the use of a meshfree method, the domain of the workpiece is discretized by a set of particles without using a structured mesh to avoid mesh distortion difficulties which occurred during the course of large plastic deformation. The proposed meshfree method is formulated for rigid-plastic material. This approach uses the flow formulation based on the assumption that elastic effects are insignificant in the metal forming operation. In the rigid-plastic analysis, the main variable of the problem becomes flow velocity rather than displacement. A numerical example is solved to validate the proposed method.

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An Unexpected Feature of a Class of Damage Evolution Models

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.713.195 ◽

2016 ◽

Vol 713 ◽

pp. 195-198

Author(s):

Sergei Alexandrov

Keyword(s):

Metal Forming ◽

Damage Evolution ◽

Plastic Material ◽

Closed Form Solution ◽

Material Model ◽

Form Solution ◽

Friction Condition ◽

Rigid Plastic ◽

Damage Evolution Equation ◽

Rigid Plastic Material

The main objective of the present paper is to demonstrate, by means of a boundary value problem permitting a closed-form solution, that no solution exists under certain conditions in the case of a rigid/plastic material model including a damage evolution equation. The source of this feature of the solution is the sticking friction condition, which is often adopted in the metal forming literature.

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Simulation of Bulk Metal Forming by Means of Finite Integral Mesh Free Methods

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/095440605x31797 ◽

2005 ◽

Vol 219 (9) ◽

pp. 949-963 ◽

Cited By ~ 2

Author(s):

C. S. Li ◽

S. W. Xiong ◽

J. M. C. Rodrigues ◽

P. A. F. Martins

Keyword(s):

Metal Forming ◽

Reproducing Kernel ◽

Particle Method ◽

Reproducing Kernel Particle Method ◽

Rigid Plastic ◽

Bulk Metal ◽

Bulk Metal Forming ◽

Mesh Free ◽

Wide Range ◽

Finite Integral

This paper draws from the fundamentals of the finite integral mesh free representation methods and of the rigid-plastic formulation for slightly compressible materials to the main aspects of computer implementation and modelling of bulk-metal forming processes. Fundamental research and development is based on the reproducing kernel particle method (RKPM) and the corrected smoothed particle hydrodynamics (CSPH) method. Special emphasis is placed on a wide range of theoretical and numerical subjects such as discretization procedures, numerical integration of the system matrices derived from the weak form, relief of volumetric locking, geometrical update of the deforming workpiece, and treatment of the frictional contact interface between the workpiece and tooling.

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Rigid-plastic analysis for metal forming processes using a reproducing kernel particle method

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2006.08.032 ◽

2007 ◽

Vol 183 (2-3) ◽

pp. 256-263 ◽

Cited By ~ 7

Author(s):

Young H. Park

Keyword(s):

Metal Forming ◽

Reproducing Kernel ◽

Particle Method ◽

Reproducing Kernel Particle Method ◽

Rigid Plastic ◽

Plastic Analysis ◽

Reproducing Kernel Particle

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Comparison Between Numerical Simulation and Experimentation of Asymmetrical Three-Roll Bending Process

Volume 3: Design and Manufacturing, Parts A and B ◽

10.1115/imece2010-38961 ◽

2010 ◽

Author(s):

Zhengkun Feng ◽

Henri Champliaud

Keyword(s):

Structural Dynamics ◽

Metal Forming ◽

Plastic Material ◽

Time Integration ◽

Material Model ◽

Rigid Bodies ◽

The Finite Element Method ◽

Shell Elements ◽

Roll Bending ◽

Bending Process

Three-roll bending processes are widely used in metal forming manufacturing due to simple configurations. Asymmetrical three-roll bending is one of the processes. This paper deals with the simulation analyses based on the finite element method for cylindrical production. The components of the roll bending machine, such as the rolls were assumed to be rigid bodies and the 4-node shell elements were used in the modeling. The tensile test of the material was simulated to determine the elasto-plastic material model of the plate. Automatic node-surface contacts were chosen for the interfaces between the plate and the rigid bodies. The nonlinear equations which represent the structural dynamics with large displacement were resolved using explicit time integration. The simulations were performed under the well-known ANSYS/LS-DYNA environment. The numerical results agree well with the experimental ones.

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A Theoretical Analysis of the Bending into Cylindrical Dies of Metal Strips

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/pime_proc_1984_198_095_02 ◽

1984 ◽

Vol 198 (2) ◽

pp. 99-108 ◽

Cited By ~ 1

Author(s):

T X Yu ◽

W Johnson

Keyword(s):

Theoretical Analysis ◽

Metal Forming ◽

Plastic Material ◽

Forming Process ◽

Rigid Plastic ◽

Rigid Plastic Material ◽

Punch Load ◽

Theoretical Predictions ◽

Metal Forming Process ◽

Good Agreement

Based on experiments on the bending of metal strips into cylindrical dies using a semi-circular ended punch (1) a theoretical analysis of this metal forming process is presented to predict the punch load—punch travel characteristic and the clearance between the punch pole and the mid-point of the strip. Elastic/plastic and rigid/plastic material idealizations are employed, and the effect of friction between the strip and the die is also considered. The theoretical predictions show good agreement with the experimental results and are useful for designers.

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Study on Drilling Force of Pore for Hard-to-Cut Material

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.455.521 ◽

2010 ◽

Vol 455 ◽

pp. 521-524

Author(s):

Yong Tang ◽

Bang Yan Ye ◽

X.F. Hu ◽

Qiang Wu

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Metal Cutting ◽

Plastic Material ◽

Material Model ◽

Element Model ◽

Drilling Process ◽

Drilling Force ◽

Rigid Plastic ◽

Key Techniques

This paper studies drilling force of pore for hard-cutting material based on theoretical and experimental investigation during pore drilling process. A coupled thermo-mechanical finite element model of metal pore drilling process was established. Some key techniques such as material model, chip separation and damage criteria and dynamic mesh self-adapting technology in the finite element simulation of metal cutting process were discussed in details. The paper simulated dynamically the chip formation of the twist drilling process in which rigid plastic material model was selected for workpieces and thermal rigid models for tools. The results indicate that the proposed finite element model is not only correct but also feasible in the prediction of the variations of drilling force and torque with amount of feed.

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