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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 27
SUMMARY:Determination of fracture criterion limits for EA1T railway steel
DESCRIPTION:The prediction of cracks in metal forming processes is a very important issue. It is very important from the point of view of designing the technologies in which these cracks may occur. One such manufacturing technology in which material cracking is very common is cross wedge rolling process. A rotary compression test was used to determine the limits of the fracture criterion. In order to determine the values needed to describe the fracture criterion, it was necessary to carry out laboratory tests and numerical simulations of the in-channel pressing process for discs made of EA1T steel under hot forming conditions. Experimental tests were carried out for forming processes at 950°C, 1050°C and 1150°C. The material tested was a disc shape with a diameter of 40 mm and a length of 20 mm; during pressing, the disc diameter was reduced to a diameter of 38 mm. The increase in forming temperature resulted in a significant increase in the forming path until fracture occurred. Numerical investigations were carried out in the finite element calculation environment Simufact.Forming 2021. Computer simulations were carried out for boundary conditions corresponding to laboratory rolling. Stress and strain distribution maps in the specimen axis were analysed during the study, which were then used to calculate the limit value of the hybrid fracture criterion dedicated to cross wedge rolling processes. After calculations according to the hybrid criterion and after statistical analysis, the limiting values of the fracture criterion were obtained, which are equal for a forming temperature of 950 °C - 0.7463; 1050 °C - 0.8936; 1150 °C - 3.1942.
CLASS:PUBLIC
DTSTART:20230614T092000
DTEND:20230614T094000
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