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The crash behaviour of hot stamped components – the effect of tailoring conditions

conference contribution
posted on 2015-01-01, 00:00 authored by Amir Abdollahpoor, X J Chen, Michael PereiraMichael Pereira, N Xiao, Bernard RolfeBernard Rolfe
It is known that tailoring a hot stamping part, to achieve locally graded properties, can improve the crash behavior. Depending on the role of the structural part (carrying either bending or axial crash load), the best position for the local regions with lower strength and higher ductility can be different. The distribution of these local regions and their mechanical properties affects the crash behavior of the part in each loading case and therefore can be effectively designed to improve the crash performance. To investigate these effects and examine the improvement possibilities, a numerical thermalmechanical-metallurgical model of a hot stamping process and a representative side impact crash model were created and analysed. The hot stamping model was used to predict the consequent phase fractions and mechanical properties of tailored hot stamping parts produced with different tailoring scenarios. In the metallurgical model, a modified phase transformation model based on Scheil’s additive principle was incorporated. The geometry and mesh of the stamped part was exported to a crash numerical model with a 3-point bending configuration. A constitutive model was used to define
the plastic behavior of the stamped part corresponding to different hardness values. Various possibilities in locally positioning the high strength or high ductility zones of material were examined.
The results show that the positioning of the soft zones has a more significant effect on the crash performance than the variation in their mechanical properties of these soft zones.

History

Event

Hot Sheet CHS2 Metal Forming of High Performance Steel. Conference (5th : 2015 : Toronto, Canada)

Pagination

591 - 599

Publisher

Verlag Wissenschaftliche Scripten

Location

Toronto, Canada

Place of publication

Auerbach, Germany

Start date

2015-05-31

End date

2015-06-03

Language

eng

Publication classification

E Conference publication; E1 Full written paper - refereed

Copyright notice

2015, Verlag Wissenschaftliche Scripten

Title of proceedings

CHS2 2015 : 5th International Conference on Hot Sheet Metal Forming of High-Performance Steel

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