SPLIT SLEEVE COLD EXPANSION OF BOLT-HOLE FOR IMPROVEMENT IN MODIFICATION OF RAIL JOINT
Keywords:
Fatigue, Residual Stresses, Split-Sleeve ProcessAbstract
This paper focuses on the Mandrellizing i.e. the cold expansion process of the rail bolt-hole joint which induces compressive residual stress around the holes, thereby enhancing the service life of it. Rail joint is the critical section where induced fatigue stresses are maximum due to the presence of bolt holes where the cross-sectional area is minimum. These holes may cause a major source of fatigue cracking when high shear loads are transferred through the joint. This makes the joint weak and ultimately the critical site for failure. Therefore it is imperative to pay attention towards improvement of fatigue life of rail joint. Residual stress is having a significant effect on fatigue life of the structural engineering components. Mandrellizing expands the hole diameter by means of the radial interference pressure to allow radial plastic flow of material and some elastic recovery after the removal of mandrel.
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