The process,impacting concrete slab with tungsten carbide button of DTH hammer bit,was simulating calculated by non-linear finite element software LS-DYNA3D on concrete model,the effects of different target mesh sizes of concrete on impaction force,impact velocity and penetration depth was discussed.
潜孔锤钻头冲击钻进的过程是一个高度非线性、大变形、破坏的过程。
shoulder dressing tool
钻杆接头端面整形工具
hard banding of tool joint
钻杆接头表面加硬圈
hard facing of tool joint
钻杆接头表面加硬层
tool joint for well-drilling machines
工具接头,钻井机用
Finite element analysis of the screw structure of the drill-stem junction
钻杆接头螺纹结构形式的有限元分析
Defects Analysis on 37CrMnMo4 Drill Pipe Joints
37CrMnMo4钻杆接头缺陷分析
A tool used for drilling.
钻头用于钻孔的工具
tools to tubing substitute
钻具连接油管的接头
Research and Application of the Techinic of Bridge Floor Treatment by Helicoid Hydraulic Motor
螺杆钻具处理塞面工艺技术研究及应用
A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.
钻头曲柄、钻柄或钻床之上用于钻孔的尖头工具
A study of the surface crack at thread root of tool joint pins by the aid of finite element method.
石油钻杆公接头螺纹牙根部表面裂纹有限元计算
Threads on rotary shouldered connections for petroleum industry
GB/T9253.1-1999石油钻杆接头螺纹
Petroleum equipment--Thread gages for rotary shouldered connections
GB/T4749-1993石油钻杆接头螺纹量规
Longitudinal-cracking Failure Analysis of Box
φ139.7mm钻杆内螺纹接头纵向开裂失效分析
Cause Analyses of Pin Joint Fracture of 139.7 mm Heavy Weight Drill Pipe
139.7mm加重钻杆外螺纹接头断裂原因分析
Failure Analysis on Tool Joint Expansion of φ88.9mm×9.35mm G105 Drill Pipe
φ88.9mm×9.35mm G105钻杆内螺纹接头胀扣失效分析
Analysis on balling up caused by helicoid hydraulic motor bypass valve failure in combined drilling technology
复合钻井过程中螺杆钻具旁通阀刺漏造成钻头泥包分析
Lighting pole welding deformation control in beacon engineering at Baotou Stadium
包头市体育场灯塔工程灯杆焊接变形控制