Analysis of Material-Specific and Geometric Influences on the Numerical Springback Prediction

Funding: AiF/EFB
Project: 11/215/17613N
Contact: Heinrich Traphöner M. Sc.
Status: Completed

This project is conducted in cooperation with the Institute of Manufacturing Technology in Erlangen.

The focus is on the evaluation of the springback behavior of sheet metal materials. The following knowledge was obtained in the project: It could be shown that the dependence of the rolling direction of the Bauschinger effect is negligible for the investigated materials and does not have to be considered in the modelling step. A load path-dependent local assignment of material parameters leads to a slightly better springback prediction, but this is disproportional to the increased effort that is caused by the characterization and the increased simulation time. For the analyzed load change indicators (LWI) a qualitative correlation between the amount of the indicator and the difference between isotropic and isotropic-kinematic material modeling could be determined. Under certain circumstances processes with a low value of the LWI can also be simulated with isotropic hardening and processes with a high LWI only with isotropic-kinematic hardening.
 

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Load change indicator and areas of comparable load paths on the modular demonstrator