Experimental Study And Simulation Analysis Of Fatigue Performance Of Metallurgical Crane Bridge Frame Material In Thermal Radiation Environment

Metallurgical bridge crane is mainly used for the transportation of molten metal which is one of the indispensable heavy equipment for the metallurgical industry.Fatigue damage accidents occasionally occur in the production process due to the metallurgical bridge cranes are often used in the high temperature environment,large dust and bad working environment in the metallurgical workshop.Therefore,it is an important guarantee for maintaining its safe operation and predicting its service life to study the fatigue performance of metallurgical casting crane bridge structure.In this paper,the tensile fatigue tests are conducted firstly to study the fatigue characteristics of Q345 B steel under moderate temperature radiation environment.The temperature setting is obtained based on the filed test temperature.Hence,the influence of temperature and load on the fatigue performance of Q345 B steel can be analyzed through data processing,S-N curve fitting and observing fatigue fractures under different temperature conditions.Secondly,a finite element model of the steel structure of the bridge has been established to study the perform static analysis of 200/63T×23.5m-A7 metallurgical casting crane in a steel-making plant at room temperature.And the temperature distribution in the finite element model is the same as the actual temperature data of each part of the bridge structure provided by a steel plant.The stress distribution of the steel structure of the bridge under the heat radiation environment can be obtained through the thermo-mechanical coupling analysis combining with the static results.Moreover,the position of the fatigue vulnerable points of the bridge structure model was analyzed by finite element analysis,which is consistent with the location of the dangerous points of the historical fault records of the metallurgical casting crane bridge structure of the steel plant.Besides,the fatigue life of the steel structure of the bridge was calculated based on the S-N curves,measured time-load spectra and static analysis results of the samples under different temperature environments.The influence of temperature on the fatigue life of the metallurgical casting crane bridge structure was analyzed.