Simulation of the fatigue-wear coupling mechanism of an aviation gear  

作　　者：Boyu ZHANG Huaiju LIU Caichao ZHU Yibo GE 

机构地区：[1]State Key Laboratory of Mechancial Transmissions,Chongqing University,Chongqing 400044,China [2]Shanghai Peentech Equipment Tech.Co.Ltd.,Shanghai 201800,China

出　　处：《Friction》2021年第6期1616-1634,共19页摩擦（英文版）

基　　金：The work was supported by the National Key R&D Program of China(Grant No.2018YFB2001300).

摘　　要：The contact fatigue of aviation gears has become more prominent with greater demands for heavy-duty and high-power density gears.Meanwhile,the coexistence of tooth contact fatigue damage and tooth profile wear leads to a complicated competitive mechanism between surface-initiated failure and subsurface-initiated contact fatigue failures.To address this issue,a fatigue-wear coupling model of an aviation gear pair was developed based on the elastic-plastic finite element method.The tooth profile surface roughness was considered,and its evolution during repeated meshing was simulated using the Archard wear formula.The fatigue damage accumulation of material points on and underneath the contact surface was captured using the Brown-Miller-Morrow multiaxial fatigue criterion.The elastic-plastic constitutive behavior of damaged material points was updated by incorporating the damage variable.Variations in the wear depth and fatigue damage around the pitch point are described,and the effect of surface roughness on the fatigue life is addressed.The results reveal that whether fatigue failure occurs initially on the surface or sub-surface depends on the level of surface roughness.Mild wear on the asperity level alleviates the local stress concentration and leads to a longer surface fatigue life compared with the result without wear.

关 键 词：gear contact fatigue tooth wear surface roughness damage accumulation 

分 类 号：TH117.1[机械工程—机械设计及理论] V215.5[航空宇航科学与技术—航空宇航推进理论与工程]