Failure Analysis with Material Variations in Rocker Arm using Finite Element Method

摘要

Rocker arm is one of the important components in an internal combustion engine. The rocker arm is driven by a camshaft which functions to push and open the inlet and exhaust valves. This allows fuel and air to be drawn into the combustion chamber during suction steps and exhaust steps. During the working process the rocker arm receives a force from the valve due to the valve spring-back force, so that at one time the rocker arm has a failure of both fatigue and component cracks. In this article the material used is titanium alloy which is usually used for racing vehicles, the method used for testing is FEM. The maximum stress value in red is 227.74 MPa. The maximum deformation is 0.28267 mm, while the result of the crack test is the largest SIFS (K) value in the horizontal crack, which is -65.869 MPa.mmO.5. Maximal J-Integral is found on horizontal crack that is equal to 0.083512 mJ/mm2. From the results above the rocker arm crack occurs due to design errors and material failure