MECHANICAL STRESSES ANALYSIS IN CYLINDER LINER FOR PERKINS 1306 DIESEL ENGINE

A cylinder liner is defined as a cylindrical part that is fitted inside the engine block to form a cylinder. It is a vital component of cylindrical engine. The most important functions of cylinder liner are to form a sliding surface for the piston to obtain a smoothly reciprocating motion, resist the wear form the piston and piston rings and sustain high pressure and high temperature. However, continuous exposure to high thermal stress, mechanical stress and friction inside combustion chamber may cause failure and reduce cylinder liner life cycle. Therefore, the main objective of this research is to study the stresses due to action of gas pressure, major thrust force of the piston, and thermal load in wet cylinder liner of Perkins 1306 diesel engine as a real case. Two materials namely cast iron, grades C4 28-48 and cast alloy steel, C4 35-56, grade 38XMIOA with three different thicknesses (t1= 13.13, t2= 9.2 and t3= 6.93) mm are considered. The finite element package ANSYS (19.1) has been used as a numerical method to calculate the stresses and deflection in 3D liner model for the three parts of cylinder sleeve. The PTC MATHCAD 4 is used to formulate the analytical solution of the selected case and the results are compared to the numerical results obtained from ANSYS. The numerical results show that the maximum deflection occurs at a point of applied piston load in which it is 0.135 mm for cast iron and 0.109 mm for steel. The deflection in circumferential is very small varied in range (-0.9 to 0.9) % of maximum deflection, and the maximum axial deflection for cast iron and steel are 0.66 mm and 0.67 mm, respectively. In addition, confirming the reliability of developed PTC MATHCAD 4 program by consider one verification case. These results show that a good agreement between the numerical and analytical methods.