弾塑性 FEM による板材成形時のスプリングバック解析

概要

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This paper shows how the prediction of springback is influenced by the description of the Bauschinger effect in constitutive models. Constitutive models describing both the texture-induced anisotropy and the Bauschinger effect were derived on the basis of Hill's quadratic yield function and some kinematic hardening rules. Springback in V-bending was simulated by using the developed elastic-plastic finite element code incorporating three different types of constitutive models : (A) an isotropic hardening model, (B) a model of combined linearly kinematic hardning and isotropic hardening, (C) a model of combined linearly and non-linearly kinematic hardening and isotropic hardening. From the simulated results, it is concluded that the Bauschinger effect must be taken into account for the accurate prediction of the springback.
1998-02-27