Keyword: «service life»

In the summer of 2018 in Rostov-on-Don the matches of the World Cup 2018 will be held. To participate in the matches, they will be viewed and broadcasted by tens of thousands of people who are distributed to different client groups. In addition to the guests, it is necessary to transport passengers from Rostov-on-Don. FIFA puts forward special requirements for the design of buses. The statistical analysis of the bus fleet of the Rostov region for the period from 2015 to 2017 is presented in the article: the number, the period of operation, the share of buses in the transport structure.

In this article substantiates the relevance of research into the material of the rim of a locomotive wheel, in particular, the assessment of its cold resistance by the method of determining impact strength. A calculated FE calculation of the sharpness-deformed state of the sample during impact bending testing is carried out, taking into account the sample of plastic hardening of the material. The results of the calculation show that the accumulation and deformation of along the sample notch is contribute a localization of deformation and determinate a more rigid stress-strain state of the pre-damaged material. Thus, the impact strength of a sample made of a material of construction with a long service life decreases due to a more rigid stress-strain state, which contributes to the onset of a ductile-brittle transition at a higher temperature. A method is proposed for assessing the cold resistance of using a numerical FEM calculation of a sample for impact strength, taking into account the actualized movement of the contact samples and the stand. The causes of typical errors in solving such problems are explained.