MATERIAL MODELLING FOR ACCURATE SPRINGBACK PREDICTION
Journal article, 2009

The magnitude of the springback depends mainly on the residual stresses in the work piece after the forming stage. An accurate prediction of residual stresses puts, in turn, high demands on the material modelling during the forming simulation. Among the various ingredients that make up the material model, the hardening law is one of the most important ones for an accurate stress distribution prediction. The hardening law should be able to consider some, or all, of the phenomena that occurs during bending and unbending of metal sheets, such as the Bauschinger effect, the transient behaviour, permanent softening and work-hardening stagnation. Five different hardening models and four different steel grades have been evaluated in the present investigation. The unknown material parameters were identified by inverse modelling of a three point bending test. The model's ability the reproduce experimental force-displacement relationships were evaluated. A simple springback experiment was performed for confirmation.

Hardening law

Inverse modelling

Springback

Bauschinger effect

Three point bending

Author

Per-Anders Eggertsen

Chalmers, Applied Mechanics, Material and Computational Mechanics

Kjell Mattiasson

Volvo Cars

International Journal of Material Forming

1960-6206 (ISSN) 1960-6214 (eISSN)

Vol. 2 Suppl. 1 793-796

Subject Categories

Mechanical Engineering

DOI

10.1007/s12289-009-0507-8

More information

Latest update

11/26/2018