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Finite element synthesized analysis of the forming process of spiral welded pipe 被引量:2
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作者 俞建荣 吴波 +3 位作者 赵增慧 凌星中 肖云峰 陈海洋 《China Welding》 EI CAS 2006年第4期71-74,共4页
Numerical simulation concerning the forming and welding process of spiral welded pipe was conducted, which included three steps : the first step was the stress analysis when the spiral was formed, and then the stress... Numerical simulation concerning the forming and welding process of spiral welded pipe was conducted, which included three steps : the first step was the stress analysis when the spiral was formed, and then the stress was regarded as initial condition of melding during the temperature field analysis in the process of welding, the last step was the thermal stress analysis of the weld seam after the welding was over. Moreover, when the steel strip was pushed, the stress was also calculated by non-linearity contact technology using Abaqus Software. By finite element modeling and calculating of the forming and welding process of the spiral welded pipe, the key points of the multi-fields synthetic simulating were studied and discussed. 展开更多
关键词 spiral welded pipe contact effect stress field temperature field finite element analysis
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The MFL Testing Methods for Welded Pipes
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作者 孙燕华 伍剑波 康宜华 《Journal of Measurement Science and Instrumentation》 CAS 2011年第4期330-332,共3页
Steel pipes are categorized into seamless pipes and welded pipes,and particularly the welded pipes’ NDT(Non-Destructive Testing)has been a challenging problem.In the case,on the basis of the presentation of welded pi... Steel pipes are categorized into seamless pipes and welded pipes,and particularly the welded pipes’ NDT(Non-Destructive Testing)has been a challenging problem.In the case,on the basis of the presentation of welded pipes,the analysis of its relevant testing key is carried out.Afterwards,the MFL(Magnetic Flux Leakage)methods for longitudinally welded line-pipes and for helically welded pipes are respectively proposed.Meanwhile,their relevant experiments are conducted,and finally the two technologies for the two types of welded pipes are verified well. 展开更多
关键词 NDT (Non-Destructive Testing MFL (Magnetic Flux Leakage welded pipe longitudinallywelded pipe spirally welded pipe
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OPTICAL TELEPHONE CORD PASSING THROUGH LONG PIPE WITH SPIRAL FLOW
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作者 K.Horii Y.Matsumae +3 位作者 Cheng Xiaoming M.Takei E.Yasukawa B.Hashimoto 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1991年第2期133-140,共8页
A new effective technique, useful in telecommunications industry for passing an optical telephone cord attached to a connector through pipeline,has been developed using the spiral flow. Using this technique, the cord ... A new effective technique, useful in telecommunications industry for passing an optical telephone cord attached to a connector through pipeline,has been developed using the spiral flow. Using this technique, the cord could be passed through a straight pipeline 150 meters long and a roll of vinyl tube 50 meters long. However, under the same condition, the cord could not pass through when using the turbulent flow. To obtain a high speed stable spiral flow, a nozzle with an annular slit connected to a conical cylinder was used. A pressurized fluid with no tangential flow was supplied through this slit and the fluid, passing through the conical cylinder, was deformed into spiral flow with the steeper axial velocity distribution compared to that of turbulence pipe flow due to Coanda effect and instability. As a result, the cord was attracted to the axis area of the pipe, which effectively increased the ability for the work of cord passing. This high ability for cord passing is attributed mainly to the reduction of the friction made between the cord and the pipe wall, caused by the deformation to spiral flow. 展开更多
关键词 PIPE OPTICAL TELEPHONE CORD PASSING THROUGH LONG PIPE WITH spiral FLOW
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TRANSPORT EFFICIENCY OF THE SPIRAL FLOW IN CIRCULAR PIPE
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作者 Peng Long-sheng, Lu Zhun-wei Taiyuan University of Technology, Taiyuan 030024, China 《Journal of Hydrodynamics》 SCIE EI CSCD 2001年第4期119-122,共4页
A concise definition of Transport Efficiency (TE) was given to examine the amount of transported grains in the pipe flow with certain energy consumption. The transport characteristics and the so-called 'roto-float... A concise definition of Transport Efficiency (TE) was given to examine the amount of transported grains in the pipe flow with certain energy consumption. The transport characteristics and the so-called 'roto-floating' characteristics were studied from the tests of sediment transport in the normal pipe flow and the spiral pipe flow, and hereby the energy gradients of the two kinds of pipe flows were obtained. By comparing the mean concentrations at the same gradient, it was concluded that the TE of the latter is several times to over ten times higher than that of the former, and the lift of the latter is 200 times larger than that of the former for the nearly same TE. The spiral flow in circular pipe is suitable for transporting fine grains of high concentration, and with sedimentation trend and coarse grains. 展开更多
关键词 spiral flow in circular pipe transport efficiency transport characteristics roto-floationg characteristics LIFT energy gradient
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