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Axle box spring is one of the key parts of the rolling stock , it can ease the uneven track , rail joints , turnouts wear and uneven subsidence , and abrasions wheels , the wheel is not round , journal eccentricity causes vehicle vibration and impact and improve the stability and comfort of the vehicle running , and to extend the service life of the vehicle parts and the rail . As trains run speeds increase , the locomotive spring susceptible to a high - speed collision of the vehicle body of an external object , and will damage the surface of the spring , so that the surface cracks which lead to fracture , and ultimately affect the fatigue life of the spring . Research vehicle collision damage of the spring on the fatigue life has important practical significance . In view of this situation , this article to a locomotive spring model , 60Si2CrVAT spring steel as raw materials , and to LS-DYNA MSC.fagtiue of finite element software platform , simulation and analysis of the spring by the collision damage the surface damaged spring fatigue life prediction . Works as follows : set the shape of the impactor for the cube , the material is granite , cast iron and aluminum , respectively, in 50 m / s , l00m / s , 150m / s , 200m / s , 250m / s , a speed of 300 m / s under impact, spring , observe the spring surface conditions , and analysis of the impact of materials on the scar length, width and depth . Set impactor material is cast iron , and remain unchanged , changing the geometry of the impactor . Impact, spring sphere at different speeds , the observation of surface deterioration and analysis of the impactor geometry scar length, width and depth . Spring cast iron sphere impactor speed of 150m / s , the impact damage fatigue life prediction , and comparative analysis of the fatigue life of the intact spring . Finally, by analyzing the results of spring protection is suggested.
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