An Upper Bound Solution Analysis of Equal Channel Angular Pressing
The purpose of this study is to obtain an upper bound solution of ECAP at 0 = ψ and φ=90 deg, which aims at analysis of the relations between ECAP upper bound pressure and the die angles of φ and ψ. The results show that the value of pressing load and the equivalent strain, e ε , decreases as the angle ψ increases at φ=90 deg, but the equivalent strain, e ε , decreases rapidly and no less than 0.90. The measured maximum load required for ECAP is in good agreement with the values obtained from the upper bound solution.
M. Gupta and Christina Y.H. Lim
W. Wei and G. Chen, "An Upper Bound Solution Analysis of Equal Channel Angular Pressing", Journal of Metastable and Nanocrystalline Materials, Vol. 23, pp. 109-112, 2005