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Cold expansion technology of connection holes in aircraft structures:A review and prospect 被引量:39
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作者 Fu Yucan Ge Ende +2 位作者 Su Honghua Xu Jiuhua Li Renzheng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2015年第4期961-973,共13页
As one kind of key anti-fatigue manufacture approaches with simplicity and effectiveness, the hole cold expansion technology satisfies the increasing needs for light weight and durability of aircraft structures.It can... As one kind of key anti-fatigue manufacture approaches with simplicity and effectiveness, the hole cold expansion technology satisfies the increasing needs for light weight and durability of aircraft structures.It can improve the fatigue life by several times at no additional weight conditions.The hole cold expansion technology has been widely used in manufacturing and repairing of both fighters and commercial aircraft, and has become a research hotspot in the strengthening technology.In recent years, hole cold expansion process methods, residual stress around expanded holes, the behavior of fatigue crack initiation and propagation, and fatigue lives after cold expansion are researched extensively through lots of experiments and finite element simulations.A review on the hole cold expansion technology research status in the last twenty years is presented in this paper.Via the analysis of the current characteristics and defects of the hole cold expansion technology, combined with the actual needs in design and manufacture of new-generation aircraft, development trends and novel research directions are presented for realizing precise and high-efficiency anti-fatigue manufacture. 展开更多
关键词 Aircraft structure Cold expansion connection hole Fatigue life Finite element simulation Residual stress
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Exploration and determination of the principles of rotary-percussive underground slimhole drilling 被引量:1
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作者 Shadrina Anastasija Saruev Lev 《International Journal of Mining Science and Technology》 SCIE EI 2014年第2期245-249,共5页
A possibility of the efficient use of rotary percussive drilling to provide drilling smaller diameter holes(40–70 mm) both in mining and prospecting is disclosed herein. A new construction designed for the nipple thr... A possibility of the efficient use of rotary percussive drilling to provide drilling smaller diameter holes(40–70 mm) both in mining and prospecting is disclosed herein. A new construction designed for the nipple thread connection is described. The relative amplitude variation, change of power pulse time and energy in their propagation throughout the drilling tool are determined. A possibility of the efficient power pulse transfer along the drill string to the rock destruction tools with new nipple connections which allow automating the make-up and breakout system of drill pipe was supported by experiments. 展开更多
关键词 Rotary-percussive drilling Smaller diameter holes Drill string Nipple thread connection Power pulse Percussive energy
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