Design and Fabrication of Equal Channel Angular Extrusion Process Analysis for Non-Ferrous Materials
(Sprache: Englisch)
"Equal Channel Angular Extrusion" (ECAE) is a significant method in industrial forming applications, which is the most important method for the production of ultrafine grained bulk samples, where plastic strains are introduced into the bulk material without...
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"Equal Channel Angular Extrusion" (ECAE) is a significant method in industrial forming applications, which is the most important method for the production of ultrafine grained bulk samples, where plastic strains are introduced into the bulk material without any changes in the cross section. ECAE has different die channel angles from which an optimum die channel angle should be identified so that efficient mechanical properties will be obtained.This study is focused on the plastic deformation behavior of Al alloys by modeling ECAE with experimental and finite element software. A solid model was generated using CATIA. The STL files of ECAE die generated in CATIA were used in DEFORM-3D for simulations. The experiments are performed by designing the ECAE tools such as die, punch and billet. A series of numerical experiments were carried out for the die angles of 115°, 125°and 135° and outer corner angle of 6°, using a billet diameter of 9mm and a height of 70mm. A detailed analysis of the strains introduced by ECAP ("Equal Channel Angular Pressing") in a single passage through the die is noted. The experiments are conducted by attaching the ECAE tools to the Universal Testing Machine on aluminum alloy. The dimensions are followed for ECAE by taking considerations from the existing literature into account. On the basis of the experiment and simulation results, load, displacement, and punch force are evaluated and compared with each other.
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Text Sample:Chapter 2.3 Finite Element Analysis of Equal Channel Angular Extrusion Process:
Kim et al (2000) studied about the die corner gap formation in equal channel angular extrusion. The finite element analysis DEFORM 2D code was used to investigate the corner gap formation between die and workpiece during plain strain ECAP process. The comparison of the deformation and die corner gap formation behavior between strain hardening material and quasi perfect plastic material was made. The result found, the larger gap formation was formed in the material with higher strain hardening rate because the softer outside part of the workpiece in the deforming region flows faster in the strain hardening material. The corner gap formation reduced the strain in the outside region of the workpiece, increased the strain in the inside region and decreased the average strain. The strain distribution of the workpiece with larger die corner gap becomes more inhomogeneous. Li et al (2004) analyzed the formation of the plastic deformation zone (PDZ) and evolution of the working load along with the ram displacement in a single pass of equal channel angular extrusion (ECAE) with an intersection angle of 90°. This study explored systematically coupled with the effects of material response, outer corner angle ( = 0°, 45°, or 90°), and friction on ECAE deformation. Effective strain calculations are compared with various analytical models and it is directly an account for the PDZ tends to perform better. Nagsekhar et al (2004) studied about the optimal tool angle for equal channel angular extrusion of strain hardening materials by finite element method. This deformation technique was imported the large amount of plastic strain in to the bulk material through the application of uniform simple shear. This process can be carried out by finite element code ABAQUS/explicit. This analysis was used to analyze the deformation behavior of extruded materials and strain homogeneity was studied for
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different tool angles. By considered, the influence of realistic parameters like, strain hardening behavior and frictional contact between the die and sample. The result found, the optimal strain homogeneity in the sample with lower dead zone deformation, without involving any effects, can be achieved with channel angle of 900 and outer corner angle of 10°.
Nagasekhar et al (2005) investigated about the stress and strain histories in equal channel angular extrusion/pressing. In this analysis several plastic strains were induced in the material through multiple equal channel extrusion. It can produce bulk ultrafine grains and it was suitable for structural applications. In this study to design an optimized ECAE die, the stress-strain histories, and punch force requirements are very important. This work was carried out by the finite element analysis code was ABAQUS/Explicit for a range of different channel angles. The result found, the peak punch force decreased gradually with the increase in channel angle. Son et al (2006) studied about the finite element investigations of friction condition in equal channel angular extrusion. This study was mainly focused on the investigation of contact phenomenon at the interface between dies and the work piece. In this, the material flow and forming load were main requirement. In this used methodology was numerical simulation of an ECAE with a CP-TiGr-1 cylindrical specimen were carried out by applying the mixed finite element formulation with tetrahedral elements under non isothermal condition. Compression test was used to determination of material data. The result found from the analysis, the forming loads varied very sensitively depending on the friction conditions. Luri et al (2006) studied about the new configuration for equal channel angular extrusion dies. This process was used to impart severe plastic deformations to processed the material and improving the properties of the materials and reducing the grain size. In
Nagasekhar et al (2005) investigated about the stress and strain histories in equal channel angular extrusion/pressing. In this analysis several plastic strains were induced in the material through multiple equal channel extrusion. It can produce bulk ultrafine grains and it was suitable for structural applications. In this study to design an optimized ECAE die, the stress-strain histories, and punch force requirements are very important. This work was carried out by the finite element analysis code was ABAQUS/Explicit for a range of different channel angles. The result found, the peak punch force decreased gradually with the increase in channel angle. Son et al (2006) studied about the finite element investigations of friction condition in equal channel angular extrusion. This study was mainly focused on the investigation of contact phenomenon at the interface between dies and the work piece. In this, the material flow and forming load were main requirement. In this used methodology was numerical simulation of an ECAE with a CP-TiGr-1 cylindrical specimen were carried out by applying the mixed finite element formulation with tetrahedral elements under non isothermal condition. Compression test was used to determination of material data. The result found from the analysis, the forming loads varied very sensitively depending on the friction conditions. Luri et al (2006) studied about the new configuration for equal channel angular extrusion dies. This process was used to impart severe plastic deformations to processed the material and improving the properties of the materials and reducing the grain size. In
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Bibliographische Angaben
- Autoren: Perumalla Janaki Ramulu , A. Lavanya
- 2017, 56 Seiten, 20 Abbildungen, Masse: 15,5 x 22 cm, Kartoniert (TB), Englisch
- Verlag: Anchor Academic Publishing
- ISBN-10: 3960671067
- ISBN-13: 9783960671060
Sprache:
Englisch
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