3D Finite Element Modeling of Molybdenum Equal Channel Angular Pressing

2008 ◽  
Author(s):  
Royi Padan ◽  
David Gorni ◽  
Leonid Rubinson ◽  
Eilon Faran ◽  
Ilan Gilad ◽  
...  
Keyword(s):  
Finite Element ◽  
Elevated Temperature ◽  
Equal Channel Angular Pressing ◽  
Effective Strain ◽  
Hard Metal ◽  
Work Piece ◽  
Element Analysis ◽  
Cross Sectional ◽  
Angular Pressing ◽  
Ecap Process

Equal-channel angular pressing (ECAP) is a manufacturing process in which a material is subjected to a severe plastic shear strain with negligible change in the cross-sectional dimensions of the work-piece. Due to the severe plastic deformation, the ECAP process was investigated experimentally mainly on ductile materials such as Cu-99% and Al-4%Cu. Application of ECAP to harder metals (such as CP-Ti or Mo) imposes several problems due to the elevated temperature involved, cracks that may appear in the material and the large forces required. Furthermore, several cycles of the ECAP are required to obtain a uniform residual strain field in the workpiece. To optimize and gain scientific insight into the ECAP process of a Mo workpiece, a combined experimental–numerical investigation was conducted. A three dimensional finite element analysis (FEA) that simulates an ECAP BC4 process of hard metal at elevated temperature was performed. Both quantitative (final simulated geometry was compared to the shape of the workpiece after ECAP) qualitative (hardness and grain size were compared to effective-strain) methods were used for FE results validation.

Analytical and Numerical Analysis Comparison of Equal Channel Angular Pressing for Al5083 Alloy

2019 ◽  
Vol 11 (11) ◽  
pp. 1100-1103 ◽  
Author(s):  
Mehmet Şahbaz ◽  
Hasan Kaya ◽  
Aykut Kentli ◽  
Mehmet Uçar ◽  
Serkan Öğüt ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Equal Channel Angular Pressing ◽  
Effective Strain ◽  
Element Analysis ◽  
Angular Pressing ◽  
Ecap Process ◽  
Design Software ◽  
Strain Increase

In this study, the equal channel angular pressing (ECAP) process was modeled by using computeraided design software. Then, it was numerically analyzed by the help of specific finite element analysis (FEA) software. Therefore, effective strain increase in each step of the four passing was obtained. Besides this, the strain increase also was calculated for every step of passing by using the analytical method, and the results of the methods were compared. Moreover, the required load for each passing was determined and the increase of it with the increase of passing was presented.

Optimization of the Equal Channel Angular Pressing (ECAP) Process for Strain Homogeneity

2007 ◽  
Vol 539-543 ◽  
pp. 3655-3660 ◽  
Author(s):  
B. Cherukuri ◽  
R. Srinivasan
Keyword(s):  
Equal Channel Angular Pressing ◽  
Large Deformations ◽  
Work Piece ◽  
Element Analysis ◽  
Angular Pressing ◽  
Ecap Process ◽  
Strain Homogeneity ◽  
Inner Radius ◽  
Dimensional Finite Element ◽  
Inside Radius

Two-Dimensional finite element analysis was carried out to optimize the equal channel angular pressing process (ECAP) for strain homogeneity under frictionless and frictional conditions. The effect of outside corner angle (Ψ), inner radius (r) and shear friction (m) on the strain homogeneity was investigated. The strain homogeneity can be increased by correcting the outside corner to eliminate the corner gap between the sample and the die at the expense of average strain. Small inside radius and outside corner radius would provide large deformations without much loss in the strain homogeneity under frictionless conditions. The work piece deformation is by bending if the inner radius exceeds a critical value. No improvement in strain homogeneity was observed under frictional conditions.

Influence of Rolling Reduction Ratio on Continuous Confined Strip Shearing Deformation Procedure Using Finite Element Analysis

2011 ◽  
Vol 284-286 ◽  
pp. 913-917
Author(s):  
Zi Hao Zhao ◽  
Xiao Jing Xu ◽  
Hai Zhou ◽  
Xin Dong Zhu ◽  
Cheng Cheng ◽  
...  
Keyword(s):  
Finite Element ◽  
Energy Consumption ◽  
Effective Strain ◽  
Reduction Ratio ◽  
Rolling Reduction ◽  
Work Piece ◽  
Element Analysis ◽  
Angular Pressing ◽  
Shearing Deformation ◽  
Deform 3D

The severe plastic deformation (SPD) procedure designated continuous confined strip shearing (CCSS/C2S2) technique based on rolling, equal channel angular pressing (ECAP) and Conform principle was simulated numerically by using finite element code DEFORM-3D. The influences of rolling reduction ratio on restoration ratio of work-piece geometry, effective strain, output velocity of processed work-piece, torque of rollers, and energy consumption feature for the C2S2 procedure were investigated. The results show that rolling reduction ratio has significant influences on C2S2 procedure. With the increase of rolling reduction ratios (5%, 10% and 20%), the restoration ratio of work-pieces geometry reduced, the magnitude of effective strain kept almost unchanged, the output velocity of processed work-piece increased, the total torque of rollers decreased, and the energy consumption used for making unit volume work-piece subjected to unit straining reduced considerably. It was found that the optimal rolling reduction ratio was about ~10 %, where the energy consumption reduced by 8.16 %, whereas the restoration ratio of work-piece geometry was almost the same as constrasting with the rolling reduction ratio of 5 %.

Finite Element Analysis of Optimum Back Pressure during Equal Channel Angular Pressing

2008 ◽  
Vol 575-578 ◽  
pp. 311-315
Author(s):  
Feng Jian Shi ◽  
Lei Gang Wang
Keyword(s):  
Finite Element ◽  
Equal Channel Angular Pressing ◽  
Effective Strain ◽  
Back Pressure ◽  
Material Behavior ◽  
Element Analysis ◽  
Die Geometry ◽  
Fine Grained ◽  
Finite Element Software ◽  
Angular Pressing

Equal channel angular pressing (ECAP) is one of the most promising processes to fabricate ultra-fine grained materials. The material deformation is affected by die geometry, material behavior, friction and back pressure. The optimum back pressure for 1100Al during ECAP was studied. The effect of back pressure on deformation behavior, effective strain and deformation load were analyzed by using finite element software. The results show that the corner gap between the billet and the die in the external part of the deformation zone decreases and even disappears with the increase of back pressure, which can produce more uniform and larger strain in the billet. The deformation load enhances with the increase of back pressure. From the simulation results, it can be found out that the optimum back pressure for 1100Al pressed in the die of Φ=90° is about 30MPa.

Numerical Simulation of Microstructure Evolution in AZ31 Magnesium Alloy during Equal Channel Angular Pressing

2014 ◽  
Vol 609-610 ◽  
pp. 495-499
Author(s):  
Guo Cheng Ren ◽  
Xiao Juan Lin ◽  
Shu Bo Xu
Keyword(s):  
Finite Element ◽  
Magnesium Alloy ◽  
Equal Channel Angular Pressing ◽  
Microstructure Evolution ◽  
Element Model ◽  
Az31 Magnesium Alloy ◽  
Angular Pressing ◽  
Ecap Process ◽  
Element Simulation ◽  
3D Software

The microstructure and material properties of AZ31 magnesium alloy are very sensitive to process parameters, which directly determine the service properties. To explore and understand the deformation behavior and the optimization of the deformation process, the microstructure evolution during equal channel angular pressing was predicted by using the DEFORM-3D software package at different temperature. To verify the finite element simulation results, the microstructure across the transverse direction of the billet was measured. The results show that the effects strain and deformation temperatures on the microstructure evolution of AZ31 magnesium during ECAP process are significant, and a good agreement between the predicted and experimental results was obtained, which confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructure evolution of ECAP process for AZ31 magnesium.

Finite Element Analysis of the Evolution of Damage during Equal Channel Angular Pressing of a Mg–3Al–1Zn Alloy

2012 ◽  
Vol 482-484 ◽  
pp. 2418-2423
Author(s):  
Feng Kang ◽  
Jing Tao Wang ◽  
Ping Cheng ◽  
Hai Ying Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Equal Channel Angular Pressing ◽  
Initial Crack ◽  
Flow Localization ◽  
Element Analysis ◽  
Fracture Characteristics ◽  
Angular Pressing ◽  
Tension And Compression ◽  
Simulation Results

Finite element analysis was used to simulate the evolution of damage in a Mg–3Al–1Zn alloy processed by equal channel angular pressing (ECAP). Oyane criterion for damage was selected to evaluate the fracture characteristics. Finite element modeling was used with experimental data obtained from tension and compression testing. The results show that initial crack may form in severe flow localization (i.e. in the inner corner) and these cracks may propagate, leading to billet segmentation. The flow grid in the simulation results is similar to that in the previous experimental results.

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