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International Journal of Forming Processes
1292-7775
Publication suspended
 

 ARTICLE VOL 4/3-4 - 2001  - pp.395-411  - doi:10.3166/ijfp.4.395-411
TITLE
Identification of non-linear Kinematic Hardening with Bend-reverse Bend Experiments in Anisotropic Sheet-metals

ABSTRACT

An inverse identification technique is proposed based on bending-unbending experiments on anisotropic sheet-metal strips. The initial anisotropy theory of plasticity is extended to include the concept of combined isotropic and non-linear kinematic hardening. This theory is adopted to characterise the anisotropic hardening due to loading-unloading which occurs in sheet-metals forming processes. To this end, a specific bending-unbending apparatus has been built to provide experimental moment-curvature curves. The constant bending moment applied over the length of the specimen allows to determined numerically the strain-stress behaviour without Finite Element Analysis. Four constitutive parameters have been identified by an inverse approach performed simultaneously on the bending and tensile tests. Our results show that bending-unbending tests are suitable to model quite accurately the constitutive behaviour of sheet metals under complex loading paths. As an example, a F.E. spring-back analysis of a U-shape deep-drawn sheet strip shows the influence of the non linear kinematic hardening.

AUTEUR(S)
Michel BRUNET, Fabrice MORESTIN, Francis SABOURIN, Stéphane GODEREAUX

Reçu le 1 juillet 2001.    Accepté le 25 octobre 2001.

KEYWORDS
Sheet-metals, anisotropy, kinematic-hardening, inverse-method, bending-unbending, spring-back.

LANGUE DE L'ARTICLE
Anglais

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