A finite element model is developed to assess the effects of the TiSiCN thin film coating of the piston ring on the structural strength of the piston subsystem. The complex, cyclically variable forces are considered in load and boundary conditions. The model included combustion dynamics, contact kinetics, piston subsystem primary and secondary motions, and lubricated contact conditions to evaluate the applied forces. A comparative analysis is performed for coated and uncoated cases. Four different crown geometries are tried for selecting the best case of crown design for coated piston subsystem components. The analysis predicts better strength in coated cases compared to uncoated ones. The type-A crown design develops less stress, while the compression ring suffers the most due to elastic deformation and is more prone to fatigue failure.

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-Suspension systems serve to keep the car wheels in contact with the road, while also providing comfort for the driver and passengers. An important part of some suspension systems are helical springs that compress and elongate to support the vehicles movement. Like any other part of the car wear and tear is common in springs as well and it reduces service life and often causes spring failure. This paper studies the effect of providing an electroless nickel coating on helical springs by comparison of coated and uncoated springs through CAD modelling and static stress analysis using FEA. The results show reduction in overall stress values for coated spring.