Durability Analysis And Optimization Of Aero-Engine Gears Considering Surface Strengthening

Aeroengines are the main source of power for the development of China’s aviation aircraft,and their safety is also a key factor in ensuring China’s aviation safety.With the rapid development of the aviation manufacturing industry,the development and production process of aero-engines will gradually change to the goal of high standard and high performance,so the requirements for the use of aero-engines will become more and more stringent,and the requirements for reliability technology higher.As one of the most critical components of aero-engines,gears are the main way to transmit power in aeroengine transmissions.Therefore,the aeroengine gear transmission system requires high durability and reliability.Aeroengine gear transmission system has complex working conditions,often bears multi-axis loads,and is prone to fatigue failure.At the same time,the consequences of fatigue failure are particularly serious,which also highlights the important research value of the durability and reliability analysis of aeroengine gear transmission system.and engineering application prospects.This article focuses on a particular type of aircraft engine transmission gear and analyzes the impact of shot peening on gear transmission durability.The research objectives are as follows:(1)Use the finite element method to simulate and analyze the shot peening process,exploring the effects of different shot peening process parameters on different material performance parameters.Investigate the residual stress,surface morphology,and strengthening layer hardness of the target after shot peening under different process parameters,as well as the effects of these factors on gear durability.(2)Add residual stress to the gear surface through a new method when establishing the gear model.In the transient simulation analysis of gear meshing,residual stress is added to each layer of tooth surface through APDL(ANSYS parametric design language)commands to simulate the residual stress introduced by shot peening.Investigate the effects of residual stress on gear transmission durability through simulation analysis.(3)Predict the contact fatigue life and root bending fatigue life of shot peened and unpeened gears based on the Matake high-cycle fatigue criterion and the R-S-N curve obtained from gear bending fatigue tests,respectively.These predictions are based on the transient simulation results of gear meshing.(4)Consider the influence of surface condition on the fatigue performance of gear structures,and optimize the process parameters of shot peening by taking into account the effects of residual stress,surface morphology,and hardness of the strengthened layer on the surface condition coefficient.