Modeling and prediction of mechanical behavior of plastic gears in simulated wear situation

The present work shapes a normal plastic gear and simulates the corresponding worn one in order to predict its mechanical behavior in operation depending on the wear. To predict the mechanical behavior of plastic gears, a modeling of the gears has been done under SOLIDWORKS. Then with ALGOR, which uses the FEM, we studied two types of gear. A normal tooth of each type of gear has been net as well as the corresponding worn tooth. We opted for the study of two cases of charge. The first (case 1) corresponds to the application of strength to the head of the tooth (Fig. 2) and the second (case2) at the pitch point of the tooth (Fig. 3). We noticed the stresses and deformations on the nodes located on the right profile of the tooth, the first node is taken at the head of the tooth. The wear has been assumed uniform on the right profile from the head to the root. The tooth has been assumed embedded at the root. We obtained some results which could allow the prediction of the number of revolutions to breaking off, knowing the wear according to this cycle.