Thermo-Mechanical Modeling and Analysis of Equal Channel Angular Pressing

2005 ◽  
Vol 23 ◽  
pp. 263-266 ◽  
Author(s):  
Qing Xiang Pei ◽  
B.H. Hu ◽  
C. Lu
Keyword(s):  
Equal Channel Angular Pressing ◽  
Temperature Rise ◽  
Flow Behavior ◽  
Material Model ◽  
Workpiece Material ◽  
Element Analysis ◽  
Modeling And Analysis ◽  
Die Geometry ◽  
Angular Pressing ◽  
Good Agreement

Thermo-mechanical finite element analysis was carried out to study the deformation behavior and temperature distribution during equal channel angular pressing (ECAP). The material model used is the Johnson-Cook constitution model that can consider the multiplication effect of strain, strain rate, and temperature on the flow stress. The effects of pressing speed, pressing temperature, workpiece material and die geometry on the temperature rise and flow behavior during ECAP process were investigated. The simulated temperature rise due to deformation heating was compared with published experimental results and a good agreement was obtained. Among the various die geometries studied, the two-turn die with 0° round corner generates the highest and most uniform plastic strain in the workpiece.

scholarly journals Deformation Heterogeneity Study of a 6061-T6 Aluminum Alloy Processed by Equal Channel Angular Pressing

2017 ◽  
Vol 905 ◽  
pp. 40-45 ◽  
Author(s):  
Carlos Reyes-Ruiz ◽  
Igniasio A. Figueroa ◽  
Chedly Braham ◽  
Jose Maria Cabrera ◽  
Olivier Zanellato ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Equal Channel Angular Pressing ◽  
Bulk Material ◽  
X Ray Diffraction ◽  
Synchrotron Diffraction ◽  
Element Analysis ◽  
Angular Pressing ◽  
Strain Oscillations ◽  
Good Agreement

Among the severe plastic deformation techniques, the equal channel angular pressing (ECAP) has drastically improved the mechanical properties of the processed alloys. However, information regarding friction phenomenon, which modifies the deformation at the surface and the heterogeneity microstrain state produced by the process itself, is still scarce. In the present work, the deformation heterogeneity and the friction effect, at the surface in the bulk material of the 6061-T6 aluminum alloy processed by ECAP, is presented and discussed. The residual stress (RS) measurements were performed by means of X-Ray diffraction. By means of synchrotron diffraction, volumetric sections of the ECAPed samples were characterized. Finite element analysis showed a good agreement with the experimentally obtained residual stress and microhardness mapping results. The study also showed that the highest deformation zones were located at the outer parts of the deformed samples (top and bottom), while the inner zone showed strain oscillations of up to 49±2 MPa.

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.

scholarly journals Finite Element Analysis of Aluminum Alloy at Many Die Channel Angles Using DEFORM-3D

2019 ◽  
Vol 8 (2) ◽  
pp. 58-61
Keyword(s):  
Equal Channel Angular Pressing ◽  
Strain Distribution ◽  
Dead Zone ◽  
Fem Simulation ◽  
Friction Reduction ◽  
Element Analysis ◽  
Channel Angle ◽  
Angular Pressing ◽  
Deform 3D ◽  
Good Agreement

Equal channel angular pressing (ECAP) is a technique used to impose strain in material which helps to increase the mechanical properties of a material. It is generally used to refine grain size of the material by passing sample through equal channel. In this study, analysis on frictional effect in equal channel angular pressing using aluminum 1100 has been done by using FEM software DEFORM-3D version 10.1. Dies with different channel angle were designed with the help CATIA. This study shows the effect of friction with different die channel angle. It has been found that with the increase in friction, reduction in corner gap is found (dead zone), which may cause material damage and improve strain distribution homogeneity. The result obtained with FEM simulation are compared to those obtained theoretically, thus it is found that the current study is in good agreement to the theoretically result

Effects of die geometry on variation of the deformation rate in equal channel angular pressing

2009 ◽  
Vol 15 (3) ◽  
pp. 439-445 ◽  
Author(s):  
Jun-Hyun Han ◽  
Hyung-Jun Chang ◽  
Kwang-Koo Jee ◽  
Kyu Hwan Oh
Keyword(s):  
Equal Channel Angular Pressing ◽  
Deformation Rate ◽  
Die Geometry ◽  
Angular Pressing

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.

Multiphysics Analysis for Temperature Rise of Electronic Connectors Using a Multiscale Model

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
K.-C. Liao ◽  
H.-L. Lu
Keyword(s):  
Temperature Rise ◽  
Three Dimensional ◽  
Electrical Current ◽  
Multiscale Model ◽  
Surface Topology ◽  
Thermal Camera ◽  
Universal Serial Bus ◽  
Crucial Issue ◽  
Element Analysis ◽  
Good Agreement

Temperature rise could be a crucial issue for some electronic connectors subjected to the relative large electrical current. A nonstatistical multiscale sinusoidal rough surface (MSRS) model is adopted to estimate the contact area between matched metallic terminals as a function of contact load. A fast Fourier transform (FFT) is conducted to characterize the measured surface topology of the terminals. Multiphysics three-dimensional (3D) finite element analysis (FEA) is then carried out to evaluate the temperature rise of mated micro-universal serial bus (USB) connectors. Temperature distributions of the terminal based on the numerical simulations are in good agreement with those based on the measurements using a thermal couple and an infrared thermal camera as well.

Sign in / Sign up

Export Citation Format

Share Document