INFLUENCE OF DIFFERENT GEAR LOAD MODELS ON CRACK PROPAGATION PREDICTIONS
In conventional fatigue models of the gear tooth root it is usual to approximate actual gear load with pulsating force acting in the highest point of the single tooth contact. However, in actual gear operation, the magnitude as well as the position of the force, changes as the gear rotates through the mesh. A study to determine the effect of moving gear tooth load on crack propagation predictions was performed. Finite element method and linear elastic fracture mechanics theories are used. Moving load produces a non-proportional load history in a gear's tooth root, consequently the maximum tangential stress theory will predict a unique kink angle for each load increment, but herein crack’s trajectory is computed at the end of the load cycle.