PREDICTING THE TOPOLOGY OF THE BENDING CORNER IN BENDING OF ULTRA HIGH STRENGTH STEELS THROUGH FINITE ELEMENT ANALYSIS

1 ÇETİN Barış
Co-authors:
2 BİLLUR Eren 3 BARANOĞLU Besim 4 TOPTAŞ Uğur 4 ALIÇ Özgür
Institutions:
1 FNSS Defense Systems Co. Inc., Engineering and Research Department, Ankara, Turkey, cetin.baris@fnss.com.tr
2 Billur Metal Form Ltd., Ankara, Turkey, eren@billur.com.tr
3 Atılım University, Metal Forming Center of Excellence Ankara, Turkey, besim.baranoglu@atilim.edu.tr
4 Nurol Makina ve Sanayi A.S., Ankara, Turkey, ugur.toptas@nurolmakina.com.tr
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
242-247
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
86 views / 24 downloads
Abstract

In bending of plates, unlike the case of sheet metal forming, a 3-D stress state is valid. Moreover, apart from the some very specific cases, the plane strain assumption is not appropriate either. Therefore; bending of thick ultra-high strength steel (UHSS) plates is a deformation process where 3-D stress and strain states exist in general. This study basically focuses on the prediction of the bending corner topology with non-linear finite element analysis method, since the laser-cut edges of the UHSS are particularly prone to edge cracking during bending operation. Within the scope of this study, an experimental set-up is designed which consists of bending tools and a servo mechanical press. The samples were bent by means of this set-up in an air-bending operation up to 90°. This experimental work was followed by optical scanning measurements. And finally, the FEA results and the scanning data were compared in 3-D space. The results showed good correlation. As a future study, the 3-D strain field of the bending corner will be tried to be measured by a professional digital image correlation (DIC) system which could probably give more precise data when combined with the data from FEA.

Keywords: Metallurgy, steel, properties, applications, testing methods
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