Feasibility analysis of functionally gradient material used on gear

LV Tian-jie， LI Qiang
（School of Transportation Science and Engineering， Beijing University of Aeronautics and Astronautics，
Beijing 100191， China）

Abstract：In order to solve the problems of distortion，the tooth root bending stress increase，the life of the gear reduction and other issues in gear heat treatment process，functionally graded material（FGM）was used on gear working surface. Firstly，the common gear performance and heat treated gear performance comparison analysis was made；then a common cylindrical involute gear model and a functionally graded material cylindrical involute gear model were created，the finite element calculation of bending stress and analysis of the two models were made. Based on the relationship with the no heat treated common gear，the relationship between the performance of heat treated gear and the performance of FGM gear was established. The FGM gear not only has better performance on the hardness of the working surface and the root bending stress，but also can avoid disadvantages about distortion and uniform carburized layer which might happened in heat treatment process. The experimental results show that FGM can be used on gear.
Key words： functionally graded material（FGM）；tooth root bending stress；spur gear；finite element analysis