期刊
APPLIED MATHEMATICAL MODELLING
卷 34, 期 7, 页码 1901-1917出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.apm.2009.10.008
关键词
Equal channel angular extrusion (ECAE); Kinematically admissible velocity field; Upper-bound analysis; Strain inhomogenity; Bezier formulation
资金
- Iran National Science Foundation (INSF)
- Sharif University of Technology, Tehran, Iran
In this research in order to predict the strain distribution and extrusion load in equal channel angular extrusion (ECAE) process of circular cross section a new three dimensional kinematically admissible velocity field has been developed based on Bezier formulation. The strain distribution in deformation zone and the effects of various terms on extrusion load were determined. The results were compared both with the experimental and numerically predicted results reported in the literature. It was found that extrusion pressure decreases with increasing both the die angle and the outer curved corner angle and increases with increasing the friction coefficient. Also, it was exhibited that increasing the angle of outer curved corner increases the inhomogeniety of strain field of deformation zone. The predictions were in a good agreement with the FEM and experimental results reported by previous researchers for different die angles and frictional conditions. (C) 2009 Elsevier Inc. All rights reserved.
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