A Simulation Method for Predicting Connecting Rod Buckling Stress and Fatigue Safety Factor of a Four-Cylinder Small Displacement Engine

摘要

The buckling results showed an improved parity with the analysis predicting using this three-dimensional simulation, 22 kN improvement from simulation, but the rig test is performed with the rod essentially at TDC, whereas peak buckling load in the engine occurs 15 degrees after TDC, which reduces the buckling strength and would give the rig a greater value. This simulation method basically should show a well match with the test results considering this difference. Regarding the fatigue results, the connecting rod showed acceptable durability in agreement with this analysis method. Test returns a safety factor of 1.18, similar to the 1.16 predicted by the simulation analysis. The failure initiation points showed decent agreement with the simulation analysis. A method for three-dimensional connecting rod strength simulation has been developed that makes it possible to calculate buckling cover factor and fatigue safety factor of connecting rod. This simulation method can predict the buckling load and high cycle safety factor accurately which was verified by connecting rod experiment.