Abstract: The deformation of sheet flowing through drawbead is of obvious cyclic loading deformation feature. As the influence of Bauschinger effect in the reverse loading the deformation in different reverse loading stage is not clear now. To investigate the cyclic deformation mechanism of sheet flowing through drawbead, make clear the deformations of different loading stage and the behavior of Bauschinger effect a material model based on Hill yield criterion and Ziegler kinematic hardening rule is built with consideration of the directivity of sheet, work hardening and Bauschinger effect. The numerical simulation comparative analysis of the cyclic plastic deformation process of sheet flowing through semi-cycle drawbead is carried out with two material models, isotropic hardening of Mises yield condition and kinematic hardening of Hill yield condition respectively, and the effectiveness of the material models being built are verified by experiment. The cyclic deformation features of sheet flowing through drawbead and the stress-strain relations at each loading stage are analyzed, and the influence law of Bauschinger effect on the stress-strain relation is revealed. The analysis of the curve of stress-strain relationship shows that sheet through semi-cycle drawbead undergoes twice bending, unloading and reverse bending in the plastic deformation process which is different from the existing results. And the Bauschinger effect factors of different integration points on the same cross section under the same loading branch are different, and so as the factors of the same integration points under different loading branch, What’s more the tangent modulus corresponding to hardening situations of different loading branch decrease significantly with the increase of cyclic loading numbers

Key words: Bauschinger effect, Cyclic loading, Drawbead, Kinematic hardening model, Tangential modulus