A study on the computation of the redundant deformation factor in wire drawing of austenitic 304 stainless steel

A study on the redundant deformation factor in wire drawing process of an austenitic 304 stainless steel is carried out. Utilizing the upper bound methods based on the trapezoidal and spherical velocity fields, the redundant deformation factors in different deformation conditions are calculated and the achieved results are compared with the results of the FEM and superposition method presented by other researchers. From the results it is concluded that when Δ values are lower than 5, the redundant deformation factors calculated from the spherical and trapezoidal velocity fields with angle β of 80–90° are valid. Also, the results of the trapezoidal velocity field with angle β of 90° are the same as those of the spherical velocity field. Moreover, the difference between the redundant deformation factors obtained from the trapezoidal velocity field and other methods is increased with decreasing angle β.