Physical aspects of improving the fatigue strength of high strength steel welded structures
This project will investigate the physical aspects of improving the fatigue performance (strength) of high-strength steel welded joints, such as for the use in construction equipment,transportation vehicles and lifting devices, in order to obtain significant weight reduction and improved service life.The samples will be manufactured from plate thicknesses of 5-10 mm with yield strengths of 355,700 and 960MPa. We will examine the well-known fatigue strength improvement technique called high frequency mechanical impact (HFMI) treatment. The required beam time will be used in parallel to the approved European project Hi-Life obtained by the applicants;the project is to be conducted at Swiss Federal Institute of Technology EPFL on 10.2017-09.2019.Measurements at ILL will allow mapping the physical characterization of welds through plate thickness,which is currently not possible in Sweden due to lack of such diffraction facilities.We will develop analytical procedures to assess the benefits and limitations of the treatment method.At the end of this research work,physical behaviour of induced stress will be available for selected loading conditions to show limits of improvement method.
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YILDIRIM Halid; NUSSBAUMER Alain and PIRLING Thilo. (2018). Physical aspects of improving the fatigue strength of high strength steel welded structures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-228
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