Abstract—Crankshaft is a most critical component in Multi cylinder Engine. The residual stresses induced by the fillet rolling process of ductile cast iron crankshaft. The stress concentration near the fillet of the crankshaft section under bending without concentrations of residual stresses are investigated by a two-dimensional elastic finite element analysis. Effective Residual stress intensity factor ranges are approximately estimated and compared to an assumed threshold stress intensity factor range which determine cracks can continue to propagate for a given crack length. The conventional material such as ductile cast-iron is replaced by Nitride steel for minimizing the residual stress of Multi cylinder crankshaft. The results indicate that the fourbubble failure criterion only determines the crack initiation life for small cracks initiated on the surfaces of fillets. The four-bubble failure criterion does not indicate whether a fatigue crack initiated on the fillet surface can propagate through or arrest in the compressive residual stress zone induced by the rolling process. The remodelled crank shaft shows that the residual stress is less when compared with conventional crankshaft.

Index Terms—Engine, Crankshaft, Residual stress, Nitrite steel, Analysis

Cite: M Manickam, S Prathiban, P Renuka Devi, and P Vijaya Kumar, "Residual Stress Analysis of Nitride Steel Crankshaft for Multi-cylinder Engine," International Journal of Mechanical Engineering and Robotics Research, Vol.3, No.4, pp. 573-577, October 2014.