Calculation of drawbead restraining forces with the Bauschinger effect

Abstract

In this paper, a numerical model for the calculation of the drawbead restraining force is described. The model is formulated using an elastoplastic finite deformation, finite element method. Because of the bending, unbending and reverse bending deformation which occurs as the sheet metal passes through the drawbead, a kinematic hardening constitutive law associated with a description of the cyclic property and the Bauschinger effect is considered. In comparison with experiments, the results based on the kinematic hardening material model proved to be better than those based on the usual isotropic hardening material model.

A numerical investigation on the use of drawbeads to minimize ear formation in deep drawing

“…For example, Keum et al [16] have developed expressions for the normal and tangential components of restraining force generated by a drawbead. Other models can be found in Carleer et al [17], Triantafyllidis et al [18], You [19], and Stoughton [20]. Some of these models have been built into commercial finite element codes such as LS-DYNA.…”

Identification of geometric parameters of drawbead in metal forming processes

“…The other is to define the equivalent drawbead instead of the real drawbead. A number of works have been performed with the aim of defining the empirical or analytical formulae for drawbead restraining forces (DBRF) [1][2][3][4][5][6][7]. Other works have also been carried out on the influence of geometric parameters [8] and process parameters [9] of drawbead to sheet metal forming processes.…”