Analytical and Numerical Modelling of Strain and Strain Rate in Equal Channel Angular Pressing (ECAP)

2006 ◽  
Vol 306-308 ◽  
pp. 965-970
Author(s):  
Hyoung Seop Kim
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Strain Rate ◽  
Equal Channel Angular Pressing ◽  
The Finite Element Method ◽  
Angular Pressing ◽  
Geometric Conditions ◽  
Strain And Strain Rate ◽  
Element Method

Equal channel angular pressing (ECAP) is a convenient forming procedure among various severe plastic deformation processes. It is based on extruding material through specially designed entry and exit channel dies to produce an ultrafine grained microstructure. The properties of the materials obtained depend on the plastic deformation behaviour during ECAP, which is governed mainly by the die geometry, the material itself and the processing conditions. As the mechanical properties of the severely deformed material are directly related to the deformation history, understanding the phenomena associated with strain and strain rate development in the ECAP process is very important. In this study, the results of continuum modelling of ECAP are described in order to understand strain and strain developments. For this purpose, the results of modelling ECAP using the finite element method and analytical solution are presented for various geometric conditions. It was concluded that although deformation is nonuniform due to geometric effects, the strain and strain rate values obtained by the analytical solutions are not much different from the average results of the finite element method.

Analyses of route Bc equal channel angular pressing and post-equal channel angular pressing behavior by the finite element method

2010 ◽  
Vol 45 (17) ◽  
pp. 4682-4688 ◽  
Author(s):  
Eun Yoo Yoon ◽  
Ji Hoon Yoo ◽  
Seung Chae Yoon ◽  
Yong Keun Kim ◽  
Seung Chul Baik ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Equal Channel Angular Pressing ◽  
The Finite Element Method ◽  
Angular Pressing ◽  
Element Method

scholarly journals Optimized Design of an ECAP Die Using the Finite Element Method for Obtaining Nanostructured Materials

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Patricia Ponce-Peña ◽  
Edgar López-Chipres ◽  
Edgar García-Sánchez ◽  
Miguel Angel Escobedo-Bretado ◽  
Brenda Xiomara Ochoa-Salazar ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Tensile Strain ◽  
Fem Analysis ◽  
Optimized Design ◽  
The Finite Element Method ◽  
Angular Pressing ◽  
Cracking Tendency ◽  
Element Method

An alloy type A16060 was exposed to severe plastic deformation to study its reaction using the finite element method (FEM). To perform this, six different configurations were used in the design of the die’s channel for ECAP (equal channel angular pressing) to obtain nanostructure materials and to optimize the process. Thanks to simulation performed with FEM, it is possible to study the homogeneity in the deformation due to the variation of conditions affecting directly the material being processed using the ECAP technique, such as the friction coefficient, extrusion speed, and mainly the die’s channel geometry being utilized in the ECAP process. Due to the tensile strain area being located mainly in the upper part of the deformed test cylinder (plastic deformation area) which increases the fracture and cracking tendency preventing the processing through ECAP the die being utilized was modified to eliminate the tensile strain area favoring the appearance of compressive stress which reduces the cracking tendency and the fracture of the sample being processed. The FEM analysis demonstrated that the strain state changed significantly from tension to compression when the modified die was used, facilitating the processing of the piece by ECAP.

Analysis of Heat Transfer and Straightening of Continuous Casting Slab Using 3D Finite Element Method

2011 ◽  
Vol 418-420 ◽  
pp. 1698-1702
Author(s):  
Qing Guo Liu ◽  
Xing Zhong Zhang ◽  
Zheng Yi Jiang ◽  
Yan Chao Sun ◽  
Bao Jun Shi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Strain Rate ◽  
Three Dimensional ◽  
Three Dimension ◽  
Element Analysis ◽  
Strain And Strain Rate ◽  
Three Dimensional Finite Element ◽  
Element Method

The straightening of curved slab results in a greater straightening strain. During the process of multi-point straightening, the peak value of the straightening strain rate will appear at each straightening point. If the strain rate is too large, the straightening cracks will appear. Solidification and heat transfer of a slab is analyzed and the generation of the solidified shell and the three-dimension temperature field of the slab are calculated by using three-dimensional finite element method (FEM). Based on the finite element analysis of five-point straightening of the curved slab, the strain and strain rate of each straightening point were obtained, which is a base of the analysis of straightening cracks.

Analysis of the Large Plastic Deformation Involved in Wear Processes Using the Finite Element Method With an Updated Lagrangian Formulation

1987 ◽  
Vol 109 (2) ◽  
pp. 330-337 ◽  
Author(s):  
Nobuo Ohmae
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Equivalent Stress ◽  
Lagrangian Formulation ◽  
The Finite Element Method ◽  
Large Plastic Deformation ◽  
Updated Lagrangian Formulation ◽  
Updated Lagrangian ◽  
Element Method

Large plastic deformation caused by friction for high purity copper was investigated using the finite element method with an updated Lagrangian formulation. The phenomenological background of this large plastic deformation was studied with a scanning electron microscope, and the nucleation of voids similar to those obtained for copper rolled to over 50 percent reduction was observed. Void nucleation was found to correlate with the agglomeration of over-saturated vacancies formed under high plastic strains. The computer-simulation analyzed such heavy deformation with an equivalent stress greater than the tensile strength and with an equivalent plastic strain of 0.44. Crack propagation was discussed by computing the J-integrals.

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