Dr Yevgen Gorash works as a Research Fellow at the Department of Mechanical & Aerospace Engineering in the University of Strathclyde (Glasgow, Scotland, UK). He obtained his PhD degree with distinction in Mechanical Engineering at Martin Luther University Halle-Wittenberg (Germany) in 2008. Then worked for three years as a lecturer in the National Technical University "Kharkiv Polytechnic Institute" (Kharkiv, Ukraine). In 2011, Yevgen joined the University of Strathclyde as a postdoc. He has been working on the variety of industry-funded research projects related to structural integrity and equipment reliability improvement. Research interests are non-linear mechanics of materials, Finite Element Analysis and Computer Aided Design. He is an author of 72 publications including 18 papers in international peer-reviewed journals, 2 book chapters and 35 international conference papers. Last three years, Yevgen has been focussed on the experimental-based research related to accelerated fatigue testing using ultrasonic technique in application to structural steels.
AbstractThere is very limited fatigue data over 10 million cycles for structural steel welds. Unalloyed low-carbon steels according to EN 10025 are dominant structural materials of the heavy machinery for minerals and mining applications. The main purpose of this research is a fatigue performance comparison of the welds made of currently preferred steel S355JR and the candidate steel S275JR. Welded machinery assemblies are designed to work for several years at typically 16-20 Hz frequencies of loading under low stress amplitudes. In order to reach a few billion cycles within a practically sustainable testing time, an accelerated fatigue testing is required. The goal of reaching gigacycle fatigue domain is achieved using the ultrasonic fatigue testing approach with Shimadzu USF-2000A system. The fatigue samples for S275JR and S355JR steels have a standard tapered shape are cut out of the welded plates to have a HAZ in the middle. The fatigue samples are prepared to investigate the influence of two surface conditions – polished and pre-corroded. In the polished samples, fatigue failures are driven primarily by the welding porosity with the fatigue life duration dependent on the size and location of pores. In the pre-corroded samples, fatigue failures are driven primarily by the corrosion pitting with the fatigue life duration dependent on the amount of corrosion damage to the surface. Visual comparison of fatigue data for S275JR and S355JR steels poses a challenge, because of the massive scatter of experimental data points making the determination of SN curves impossible. Therefore, statistical approach is used.
|Room 10||Wednesday 29th November||15:30-16:00||Yevgen Gorash|
S09-1 Fatigue of assemblies
116 - Ultrasonic fatigue testing of welds made of structural steels S355JR and S275JR