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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 RolfeThe 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°.
History
Event
International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes (7th : 2008 : Interlaken, Switzerland)Pagination
539 - 544Publisher
ETH Eidgenössische Technische HochschuleLocation
Interlaken, SwitzerlandPlace of publication
Zurich, SwitzerlandStart date
2008-09-01End date
2008-09-05ISBN-13
9783909386802Language
engNotes
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E1 Full written paper - refereedCopyright notice
2008, ETH Eidgenössische Technische HochschuleEditor/Contributor(s)
P HoraTitle of proceedings
NUMISHEET 2008 : Proceedings of the 7th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming ProcessesUsage metrics
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