@misc{ErmilovaKazakWeiss, author = {Ermilova, Evgeniia and Kazak, Fedor and Weiß, Sabine}, title = {Stability of structured sheet metals during buckling}, series = {Materials Testing}, volume = {61}, journal = {Materials Testing}, number = {10}, issn = {2195-8572}, doi = {10.3139/120.111403}, pages = {929 -- 935}, abstract = {Structured materials can be a progressive alternative to commonly used flat sheets. There is an enormous range of possibilities for using structured sheet metals due to their better stability. However, the effective use of these materials as well as their implementation in production requires precise knowledge about specific properties of structured sheet metals. The aim of this work is to obtain new knowledge about stiffness and stability during the deformation of this material. The structured sheet metals were investigated by means of buckling tests. The steel type investigated is a commonly used deep-drawing steel DC04. Six types of structure arrangements were compared to non-structured (flat) specimens as a reference. The influence of the type of structure arrangement as well as the deformation speed on the mechanical properties was investigated.}, language = {en} } @misc{ErmilovaNikitinWeiss, author = {Ermilova, Evgeniia and Nikitin, Alexander and Weiß, Sabine}, title = {The Local Strain Evolution for Structured Sheet Metals During Uniaxial Deformation}, series = {Forming the Future : Proceedings of the 13th International Conference on the Technology of Plasticity}, journal = {Forming the Future : Proceedings of the 13th International Conference on the Technology of Plasticity}, editor = {Daehn, Glenn and Cao, Jian and Kinsey, Brad and Tekkaya, A. Erman and Vivek, Anupam and Yoshida, Yoshinori}, edition = {1}, publisher = {Springer, Cham}, isbn = {978-3-030-75381-8}, issn = {2367-1696}, doi = {10.1007/978-3-030-75381-8_143}, pages = {1701 -- 1711}, abstract = {Structured materials can be progressive alternatives to commonly used flat sheets because of their higher bending stiffness and stability compared to flat sheet metals, made of the same alloy. The application of sheet metals requires accurate information regarding their strength and deformation behavior. Such data are not commonly available and have to be measured by specific test setups and implementation of tests. The aim of this work is to obtain new knowledge about deformation mechanisms of structured sheet metals. Structured sheet metals (SSM) made of conventional deep-drawing steel DC04 were investigated by means of tensile tests. The influence of the structure type arrangement on the deformation behavior was analyzed. The evolution of local strains was analyzed by means of strain gauge measurements as well as 3D-displacement measurements with an ARAMIS highresolution camera system. Local orientation changes in different structural elements were measured using the electron backscatter diffraction technique.}, language = {en} } @misc{NikitinTurabovErmilovaetal., author = {Nikitin, Alexander and Turabov, Dashqin and Ermilova, Evgeniia and Evdokimov, Anton and Ossenbrink, Ralf and Seidlitz, Holger}, title = {Using dynamic resistance to predict electrode surface degradation in resistance spot welding of 5182 aluminum alloy}, series = {Welding in the World}, volume = {69}, journal = {Welding in the World}, doi = {10.1007/s40194-024-01872-9}, pages = {449 -- 458}, abstract = {In this study, the correlation between dynamic resistance during the first 10 ms of welding time and the electrode surface condition in resistance spot welding of 5182 aluminum alloy has been investigated. The electrode surface rapidly degrades due to contamination and morphological changes, adversely affecting the weld spot surface. The accumulation of Cu-Al intermetallic phases on the electrode surface alters its roughness, leading to variations in dynamic resistance. By analyzing this correlation, optimal electrode milling intervals were identified to extend electrode life. This work focused on detecting crater formation on the electrode surface through dynamic resistance monitoring. The results indicate that resistance measurements provide a reliable approach for evaluating electrode wear, optimizing maintenance schedules, and reducing material removal during milling.}, language = {en} }