Abstract
This article discusses the causes of fatigue cracks in the crane girders of overhead cranes that work with heavy loads, high speeds, and a large number of inclusions within an hour. The main defects and damages of crane beams are shown. As a result of repeated exposure to loads on crane beams, fatigue failures and stress redistribution occur, which can lead to complete destruction. The article focuses on determining the regularity of fatigue crack growth under various material properties and loads, as well as the possibility of using semi-empirical theory. At the end of the article, the ways of changing the fastening of the rail to the crane beam are given as an additional measure when strengthening structures with a reduced resource.
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