Abstract: This paper introduces a new fork-type universal joint on the turbodrill and presents a finite element analysis for the upper joint to determine its.stress distribution and to locate the maximum stress point.On a NJ-100R torsion tester,resistance measurement was run on a 1:2 steel model.By measuring the stress on some surface points and using the freezing slice method of threedimensional photoelasticity,the stress distribution accuracy of finite element ean be obtaived Improved structures of fork-type universal joint are suggested and are used in tool design.

摘要： 用有限元法对涡轮钻具上使用的新型叉口式万向节结构及其上接头进行了分析:确定其应力分布形式,找出应力最大点的位置,同时,在NJ-100B型扭转试验机上,对1∶2的钢件模型进行电测实验,测出了表面一些点的应力;用三维光弹冻结切片实验,测出万向节的应力分布,证明有限元计算结果的正确性.最后,根据分析结果提出改进现有叉口式万向节结构的措施,并在实际设计中得到应用.

关键词: 涡轮钻具, 万向节, 有限元法, 扭矩作用, 轴向应力作用