Comparison of the Continuous Constrained Double Bending process with Equal Channel Angular Extrusion Conform process by simulation modelling

Abstract

This paper investigates the possibility of creating conditions for severe plastic deformation by continuous constrained double bending (CCDB Conform) with a small relative bending radiuses Rb/T of 0.7 to 0.1 in trapezoidal calibers, developed using virtual tools in the CAD/CAE software environment. The CCDB Conform process was analyzed and compared with the ECAE Conform process using the accumulated effective strains, the workability parameter by SPD, the distribution of mean stresses and strain rates determined by simulation modelling. It is found that the equal channel angular extrusion is a special case of the constrained double bending process with a very small relative bending radius ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$R_{b}/T\leq 0.1$</tex> ).