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Accuracy and precision assesment of stochastic simulation tools for springback variation

conference contribution
posted on 2008-01-01, 00:00 authored by Timothy De Souza, Bernard RolfeBernard Rolfe
The sheet forming industry is plagued by inherent variations in its many input variables, making quality control and improvements a major hurdle. This is particularly poignant for Advanced High Strength Steels (AHSS), which exhibit a large degree of property variability. Current FE-based simulation packages are successful at predicting the manufacturability of a particular sheet metal components, however, due to their numerical deterministic nature are inherently unable to predict the performance of a real-life production process. Though they are now beginning to incorporate the stochastic nature of production in their codes. This work investigates the accuracy and precision of a current stochastic simulation package, AutoForm Sigma v4.1, by developing an experimental data set where all main sources of variation are captured through precise measurements and standard tensile tests. Using a Dual Phase 600Mpa grade steel a series of semi-cylindrical channels are formed at two Blank Holder Pressure levels where the response metric is the variation in springback determined by the flange angle. The process is replicated in AutoForm Sigma and an assessment of accuracy and precision of the predictions are performed. Results indicate a very good correspondence to the experimental trials, with mean springback response predicted to within 1 ° of the flange angle and the interquartile spread of results to within 0.22°.



International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes (7th : 2008 : Interlaken, Switzerland)


539 - 544


ETH Eidgenössische Technische Hochschule


Interlaken, Switzerland

Place of publication

Zurich, Switzerland

Start date


End date







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Publication classification

E1 Full written paper - refereed

Copyright notice

2008, ETH Eidgenössische Technische Hochschule


P Hora

Title of proceedings

NUMISHEET 2008 : Proceedings of the 7th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

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