Effect of the Slenderness Relation on In-Plane Deformation in Stack Compression Tests

• Published in: Acta materialia transylvanica Vol. 7; no. 1; pp. 24 - 28
• Main Authors: Kölüs, Martin László, Borbély, Richárd, Béres, Gábor József
• Format: Journal Article
• Language: English
• Published: 2024
• ISSN: 2601-8799; 2601-8799
• DOI: 10.33924/amt-2024-01-05

In forming technologies and their simulation, knowing the flow curve characteristic of the material is an essential parameter. Acquiring this knowledge is particularly challenging for sheet materials in high strain ranges. It is well-known that friction and geometric relationships have a distorting effect on the flow curves, thus compensation is necessary. However, the geometric ratio can not only influence the formation of the flow curve, if our material shows anisotropic behaviour. In our research, using compression tests, we examined the deformation relations of deformed specimens through digital imaging methods. The stack compression test is widely used to determine the flow curve in a broad range of large deformation. During the test, several disk specimens with the same geometric characteristics were stacked on top of each other to form a final test piece, and then compression tests were conducted on these assemblies. We found that at low values of the geometric ratio (0.1 in our study), the proportion of plastic, planar principal strains indicating anisotropic behaviour is greater than at higher geometric ratios (0.5 and 1.0 in our study).