复合载荷作用下矿用定向钻杆接头的三维力学特性分析  

Three-dimensional mechanical characteristics of mining directional drill pipe joints under composite loading

作　　者：王帮文 赵宽[1] 薛河[1] 李金平[2] 崔强 WANG Bangwen;ZHAO Kuan;XUE He;LI Jinping;CUI Qiang(College of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;College of Engineering Machinery,Chang'an University,Xi'an 710054,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]长安大学工程机械学院,陕西西安710054

出　　处：《煤炭工程》2024年第3期167-173,共7页Coal Engineering

基　　金：高速公路筑养装备与技术教育部工程研究中心(长安大学)开放基金资助(300102253512)。

摘　　要：煤矿钻杆在严苛的服役环境和复杂的受力状态下易失效,不仅影响正常生产,而且还因打捞困难致使事故恶化。针对上述问题,以煤矿φ73 mm外平定向钻杆为研究对象,对不同载荷下钻杆接头进行了受力分析,并通过单轴拉伸试验获得了接头材料的力学性能参数,构建了接头材料的本构模型。在此基础上,应用虚功原理、Von Mises屈服准则和接触非线性理论建立了钻杆接头螺纹的弹塑性有限元分析模型,分析了不同工况载荷作用下接头部位的受力状态及应力场分布规律。研究结果表明:在预紧扭矩为2000 N·m时,该钻杆接头具有良好的密封性能和联接强度;单扭和拉扭载荷下,靠近主台肩的第一螺纹牙为主要失效部位;在压、弯、扭载荷下,主台肩为主要失效部位;在钻机最大扭矩与推进力的作用下,接头的抗弯能力达到3°/3 m。Due to the harsh service environment and complex stress state,mining drill pipe is prone to failure,which seriously affects normal production and worsens the accident due to salvage difficulties.The forces on theΦ73 mm outer-flat directional drill pipe joints were analyzed under different loads.The mechanical property parameters of the joint material were obtained through uniaxial tensile tests,and the constitutive model of the joint material was constructed.Then,the elastic-plastic finite element analysis model of the drill pipe joint thread was established,applying the virtual work principle,Von Mises yield criterion,and contact nonlinear theory to analyze the stress state and stress field distribution of the joint under the action of loads in different working conditions.It was demonstrated that the drill pipe joint exhibits satisfactory sealing performance and connection strength at a preload torque of 2000 N·m.The first thread tooth near the main shoulder is the primary failure site under both single torsion and tension torsion loads.Meanwhile,the main shoulder is the principal failure location under compression,bending,and torsion loads.Moreover,under the combined effect of the maximum torque and thrust of the drilling rig,the joint's bending resistance is up to reach 3°/3 m.

关 键 词：钻杆接头 井眼曲率 复合载荷 三维有限元分析 

分 类 号：TD421[矿业工程—矿山机电]