The effect of height to diameter ratio at stack compression tests on biaxial yield stress
Martin L. Kölüs, Gábor Kalácska, Gábor J. Béres
Abstract. This study presents experimental stack compression test results of samples with different height-to-diameter (aspect) ratios for a simplified calculation of the friction- and the stress state contribution on the flow stress compared to the case of simple tension. Standard uniaxial tension tests formed the basis of the investigations as reference curves, and the stack compression tests were carried out on the same material, on commercially available DC04 steel sheet. The aim was to experimentally observe and possibly separate the anisotropic, pure material behavior from the friction-forced reaction of the material to determine the equi-biaxial yield stress for proper yield surface election. Our results show that with proper lubrication conditions, the stress increase caused by friction can be kept at low value for high aspect ratios, as well as with the comparison of the high and low aspect ratios, the value of the Coulomb friction coefficient, and thus the friction contribution on the flow stress can be calculated. After a stress compensation based on the obtained friction coefficient, the calculated stress ratios led to the monitoring of the goodness of different yield surfaces.
Keywords
Metal Forming, Sheet Metal, Compression Test
Published online 4/1/2025, 8 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Martin L. Kölüs, Gábor Kalácska, Gábor J. Béres, The effect of height to diameter ratio at stack compression tests on biaxial yield stress, Materials Research Proceedings, Vol. 52, pp 220-227, 2025
DOI: https://doi.org/10.21741/9781644903551-27
The article was published as article 27 of the book Sheet Metal 2025
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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