Engineering Transactions, 55, 3, pp. 197–216, 2007

Finite Element Analysis of Strain Non-Uniformity in Two Processes of Severe Plastic Deformation

J. MACIEJEWSKI
Institute of Fundamental Technological Research Polish Academy of Sciences

H. KOPEĆ
Institute of Fundamental Technological Research Polish Academy of Sciences

H. PETRYK
Institute of Fundamental Technological Research Polish Academy of Sciences

Two severe plastic deformation (SPD) processing techniques, namely equal-channel angular
pressing (ECAP) and cyclic extrusion-compression (CEC), are investigated by using the finite
element method. The major aspect examined is the non-uniformity of the accumulated, equivalent
plastic strain after processing with the use of different shapes of the die. The quantitative
effect of several parameters on the plastic flow is determined. It is found that the diameter ratio
of the chambers and narrower channel in the CEC method, and also the inclination angle of
connecting conical parts, can affect strongly the degree of strain non-uniformity. Comparison
is made of distributions of equivalent strain after two passes of ECAP for two different routes
and with two die profiles.
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