Abstract
In this study, a method for analyzing the fatigue strength of a bogie frame under a random load was proposed. Based on the geometric features, a welded joint coordinate system was established to compute the stress components of each node in this coordinate system. With the influence of small amplitude cycles included, based on the corrected S–N curve and a method for calculating the equivalent constant amplitude stress, the node and comprehensive degree of utilization were calculated based on the anti-fatigue design grade of welded joints to evaluate the fatigue strength of a structure under a given lifespan. The FKM and International Institute of Welding methods were used to evaluate the fatigue strength of typical welded joints of a bogie frame. The characteristics of the node degree of utilization under different analytical methods were compared, and the results showed that when the time histories of the three stress components of the nodes had significant non-proportional features, the FKM method obtained conservative results. When the time histories of the three stress components of the nodes were synchronized, the criterion value specified by the International Institute of Welding method was the main factor affecting the distribution characteristics of the node degree of utilization. The analysis based on the International Institute of Welding method can effectively balance the lightweight design and reliability of the structure.
Highlights
The welding frame is an important bearing component of a bogie and its fatigue strength has attracted considerable attention
The characteristics of the node degree of utilization under different analytical methods were compared, and the results showed that when the time histories of the three stress components of the nodes had significant non-proportional features, the FKM method obtained conservative results
Considering the limitations of currently available engineering analysis methods and based on the results of fatigue tests of typical welded joints, the contribution of small amplitude cycles to structural fatigue damage was taken into account, and the influence of the stress characteristics under random loads was fully considered to study a method for evaluating the fatigue strength of a bogie frame, which is of great significance for ensuring its structural reliability
Summary
The welding frame is an important bearing component of a bogie and its fatigue strength has attracted considerable attention. Considering the limitations of currently available engineering analysis methods and based on the results of fatigue tests of typical welded joints, the contribution of small amplitude cycles to structural fatigue damage was taken into account, and the influence of the stress characteristics under random loads was fully considered to study a method for evaluating the fatigue strength of a bogie frame, which is of great significance for ensuring its structural reliability.
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