Determination of Forming - Limit Diagrams Considering Various Models for Steel Sheets

Abstract

He is graduated on Faculty of Mechanical Engineering, TU in Košice, where he received also scientific degree PhD and where he habilitated at the field of mechanical engineering processes and materials. From 2004, he has been head of section of Computer Aided of Production Engineering on the Department. His research works are mainly focused on the area of computer simulations in deep-drawing processes. He is a member of International Deep-Drawing Research Group. He is author of three university textbooks and more than 70 publications in journals and conference proceedings at Slovakia and abroad. He has been worked on several grant projects, research tasks and many projects solved for industry. prof. Ing. Emil Spišák, CSc. (born 1955) is professor of Department of Technologies and Materials, Faculty of Mechanical Engineering, Technical University of Košice. He is head of the Department of Technologies and Materials and Vice-Rector for Development and Construction of the University. He served as Vice-Dean for 4 years and Vice-Rector for 8 years. He works in the area of evaluating of material properties, material failures, analysis and quantification of production factors influence in production of thin steel sheet stamping parts, modelling and simulation of technological processes, mainly forming processes. He is national secretary and a member of International Deep-Drawing Research Group. He is author of 5 monographs and more than 200 publications in journals and conference proceedings at Slovakia and abroad. His published works were cited 115 times. He has been worked on 60 grant projects, research tasks and 47 projects solved for industry.

Properties assessment of the first industrial coils of low-density duplex δ-TRIP steel

“…The left side of duplex δ-TRIP steel FLD was created by the NADDRG model which assumed that the slope of left-side FLD was about 45°. 26,27 The FLD did not show an optimistic global formability, which was in accordance with what a low R -value suggested. One of the interesting observations is that the difference of LDH between δ-TRIP and DP780 (Fig.…”

“…8b) increases from plane strain state to biaxial tension state (except Number 9), which is consistent with the general conclusion that R-value has practically little effect in the plane strain region but a maximum effect in biaxial tension region. 27…”

Optical Measuring of 3D Deformation in Sheet Metal Forming

“…Thus, the forming process can directly be evaluated with respect to the material limits. [9,10] The FLD shows clearly that a few measurement points are above the forming limit curve (Fig. 10) of the used material.…”

Effect of heat treatment temperatures on formability of SS 304 during tube hydroforming process

“…10 Critical thickness based on TGNC of the bulged tube Fig. 11 Effect of heat treatment temperatures on FLD literature [50]. All the NADDRG models are over predicted the FLD when compared to the numerical predicted FLD.…”