Mechanical Response Characteristics and Crack Treatment Methods of CN1/18 Turnout Frog Rail Components
A finite element model of the CN1/18 turnout frog rail component was established to address the potential issues such as damage of the center rail,wing rail,and fork heel switch rail of CN series turnouts under unfavorable conditions.The mechanical response characteristics were calculated and analyzed,and the allowable stress method was used to analyze and verify the causes of the diseases.Corresponding treatment measures were proposed based on the stress state of the rail components.The results indicate that the weak sections of the center rail and fork heel switch rail have high stress,and stress concentration may occur under conditions of processing defects or scratches and abrasions.Under quasi-static loading,the strength of the wing rail meets the requirements,but the safety margin is small.Under long-term service conditions,rail damage may occur due to external environmental changes,leading to crack initiation and fracture.For center rails,visual inspection and eddy flaw detection of the intersection angle between the flange and the rail bottom should be strengthened,and manual polishing or rail replacement should be carried out in a timely manner.For wing rails,special flaw detection should be carried out in a timely manner to check and adjust the internal inclination.For fork heel pointed rails,magnetic particle flaw detection should be carried out in a timely manner,and rail replacement should be carried out when cracks are found.
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