an investigation into the effective parameters in optimal design of ecap-conform process of commercially pure titanium using statistical and numerical approaches

The equal channel angular pressing-conform (ecap-conform) processimproves the mechanical and functional properties of materials and overcomes the disadvantagesof conventional equal channel angular pressing (ecap). the main objective of thisstudy is to investigate the variable in the ecap-conform process of pure titanium grade2. the design of experiments with full factorial technique was implemented in conjunctionwith finite element numerical simulation. the equivalent plastic strain, required torque,applied force on the ecap die, and the warping radius of the product were measured,and the results were interpreted using analysis of variance. it was found that the ecapdie angles and the rod bending angle had the highest eect on both imposed strain andrequired torque. further, the rod bending angle and the rod-die friction had no significanteect on the warping radius. the optimal values were specified for minimizing the requiredtorque, reaction force, and warping radius and maximizing the imposed strain. based onthe optimal estimated parameters, the minimum values of torque, force, and warping radiusand maximum value of equivalent strain were predicted to be 8.4 kn.m, 42 kn, 0.36 m, and1.7, respectively. moreover, compared to the case of numerical simulation, the responseoptimizer obtained the results with less than 8% error.