电磁波电阻率悬挂孔应力集中分析及优化设计

Analysis on Stress Concentration Produced by Hanging Holes for Electromagnetic Wave Resistivity Instrument and the Structure Optimization Design

摘要:

电磁波电阻率钻铤悬挂孔产生的应力集中，是钻铤结构强度最薄弱的环节，最终影响钻铤使用寿命。介绍了电磁波电阻率钻铤结构形式，对钻铤两悬挂孔孔间距离以及在圆周方向上与谐振窗的不同夹角分别进行讨论，利用三维建模软件和有限元分析软件模块分别对设计的钻铤结构进行实体建模，在单独施加扭矩载荷和施加压力、扭矩复合载荷2种情况下进行有限元计算，优选出一种合理结构，为下一步的优化设计和加工新型钻铤提供了理论基础。

关键词:电磁波电阻率;圆孔应力集中;优化设计;有限元计算;钻铤

Abstract:

The stress concentration caused by the drill collar hanging holes for the electromagnetic wave resistivity tool is the weakest strength point of the drill collar, which finally influences the service life of drill collar. The structure of the drill collar with electromagnetic wave resistivity instrument is described in this paper, and the schemes of distance between the hanging holes of drill collar and the different angles with the resonant window in the circumferential directions are discussed. The entity models of drill dollar structures are made by three-dimensional modeling software and finite element analysis software module, the finite element calculations are performed under 2 conditions of imposing single torque load and imposing the compound load of pressure and torque to select a kind of reasonable structure, which can be a theoretical basis for optimal design and manufacture of new drill collar next.

Key words:electromagnetic wave resistivity; round hole stress concentration; optimal design; finite element calculation; drill collar