中文摘要：

涡轮钻具轴承组在恶劣的工作环境中受到钻压、水力载荷以及钻进冲击与振动的作用，容易发生磨损现象，直接影响涡轮钻具的使用寿命。以够127mm涡轮钻具为例，根据弹塑性力学和赫兹接触理论，运用ABAQUS软件建立定子一滚珠-转子非线性接触问题有限元模型，针对不同磨损程度的滚珠轴承进行了数值模拟分析。研究结果表明，随磨损量的增大，轴承定子、转子与滚珠的接触面积逐渐减小，应力集中现象加剧，接触应力明显增大；最大接触应力出现在滚珠上，且与磨损量呈现非线性关系；相同工况下，磨损2mm后滚珠的最大Mises应力比未磨损时增加了14倍，轴承发生失效。该项研究成果对涡轮钻具设计及寿命预测具有指导作用。

英文摘要：

Under WOB, hydraulic load and drilling impact and vibration, the turbodrill bearing pack is prone to wear, which will directly affect service life of the turbodrill. In this paper, taking 0127 mm turbodrill as an example, a finite element model is built for nonlinear contact of stator-roller-rotor by using ABAQUS software based on elastic-plastic mechanics and Hertz contact theory. Then, the model is used to conduct a numerical simu- lation analysis on the roller bearing subject to different degrees of wear. Research results show that, with wearing extent increasing, the contact of bearing stator and rotor with the roller is reduced, stress concentration is aggrava- ted, and contact stress significantly increases; maximum contact stress occurs on the roller and follows a nonlinear relation with the wearing extent; under the same operating conditions, maximum Mises stress of the roller subject to 2 mm wear depth is 14 times more than that without wear, so the bearing fails. The research results play a role of guideline on turbodrill design and service life prediction.