Abstract
The paper provides examples of negative changes of mechanical properties of metals, including 20L cast steel, that are used in manufacturing of bearing elements of bogies for freight cars, which are manifested with growth of cyclic operating time. In order to study relationship of mechanical properties the authors have carried out a mathematical description of processes occurring at uniaxial quasi-static stretching in representative volume of fragile and viscous steel for car manufacturing with various cyclic operating time. Well known models of structural steel are supplemented by the Mironov - Yakushev model that considers a softening stage in separate microstructural seeds and that is useful for studying fragile and viscous steel. The authors have studied damage of steel by a method of preventive unloading on a stage of poet-failure deformation with a construction of full tensile stress-strain diagrams at stretching of studied volume of metal and have compared with results of tests of full-scale samples. Results of modeling show a decrease of all mechanical properties of metals after operating time and an interaction with the tensile stress-strain diagram.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
