Long term, his scientific and research activities are oriented to the field of technological prediction of formability of steel sheets with higher strength properties, testing of material properties of steel sheets, simulation of stamping processes, the evaluation of the technical-economic level of production and engineering products. Prof. Evin was the principal investigator of 4 VEGA and 1 APVV projects, co-partner of several national VEGA, APVV and international scientific research projects and dozens of projects for practice. B.Sc. and M.Sc. degree in the field of Mechanical Technologies at the same university in 2010 and 2012. His current field of interest is focused on the area of sheet metal forming, such as measurement and evaluation of deformation, simulation of sheet metal forming processes.Abstract: This In order to define the friction coefficient the simulator of strip drawn test between flat dies and cup test were applied. To evaluate the coefficient between flat dies the modified Coulumb law was used and for defining the friction at drawing edge of die the modified Ouehler formula was applied. Due to these both evaluation processes it was enabled to point out the difference of friction coefficient values in various contact areas of rolling product and the tool. In his paper there are presented the measurement and evaluation processes of friction coefficient by applying the cup test. For experimental research the following types of materials are suitable: DC 05-extra deep drawable steel sheet, DX 54D -extra deep drawable Zn coated steel sheet, austenitic steel sheet DIN 1.4301.
In the automotive industry considerable attention is paid to innovations oriented especially to meeting safety and environmental requirements. Concepts of vehicle safety focus on resistance of deformation zone components to impact and resistance to intrusion of undesirable fragments into the passengers´ space. In terms of these aspects the samples of the base materials from micro-alloyed steels HSLA - H220PD, DP 600 and TRIP - RAK 40/70 and also welded by solid-state fibre laser YLS-5000 were analysed. Multi-phase structure materials TRIP - RAK 40/70 and DP 600 showed considerably higher values of absorption capacity, strength, and stiffness than in case of single-phase structure material HSLA - H220PD. The greatest values of absorption capacity, strength, and stiffness were recorded in material TRIP - RAK 40/70 with ferritic matrix and a certain fraction of residual austenite, bainite, and martensite. Absorption capacity, strength, and stiffness have strong correlation with material constant K and strain hardening exponent.
This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expressed or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed In this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission, or employee of such contractor, to the extent that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employment or contract with the Commission, or his employment with such contractor.
In terms of the current trend of research and development of new materials and optimization of current materials in the automotive industry, the greatest attention is paid to progressive high-strength dual-phase (DP) steels with increased stampability, which are designed for cold stamping for specific internal car body components of the current market. New grades of DP steels provide a combination of high strength and good formability and contribute to the weight savings of vehicle parts by 10 to 20 %, compared to current DP grades. Thanks to their top properties, DP steels with increased formability can absorb more crash energy using less steel. As a result, high-strength DP780GI and DP780GI-HF materials of first generation (hereinfater DP780GI-HF) were analyzed. The stampability improvement of DP steels was demonstrated by the experimentally determined Forming Limit Curves for both steels.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.