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R. COMANECI1,* , L. G. BUJOREANU1, C. BACIU2, A. M. PREDESCU2, D. SAVASTRU3
Equal channel angular pressing (ECAP) is a well-established method for grain refinement in metallic materials by large shear. ECAP is a discontinuous process, so a new sample pushes out the previous sample. As a result, the head and the tail of the sample become strongly distorted, and they must be removed for the next pass, leading to a smaller work piece, pass by pass. To avoid the decreasing in length of the work piece, a multi-pass ECAP without removing the work piece from the die was investigated. Experimental ECAP using a special die having 5 orthogonal channels and dedicated hydraulic pistons was performed successfully. A complete processing cycle consisting of 4 passes via route BC balanced the wellknown nonuniformity of the strain during ECAP. To get the overall behavior of the material and the accumulated strain distribution history, a 3D finite element analysis was performed. Experimental tests and hardness measurements using tracking point method were conducted in order to validate the simulation, thus completing the study. The results create opportunities in developing integrated systems designed to perform different ECAP routes for any imposed number of passes..
Equal channel angular pressing, Finite element analysis, Strain, Aluminum.
R. COMANECI, L. G. BUJOREANU, C. BACIU, A. M. PREDESCU, D. SAVASTRU, Finite element analysis of equal channel angular pressing by using a multi-pass die, Optoelectronics and Advanced Materials - Rapid Communications, 9, 9-10, September-October 2015, pp.1322-1327 (2015).
Submitted at: June 6, 2015
Accepted at: Sept. 9, 2015
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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