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RISS 인기검색어
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- 저자 : Neng Gan (검색결과 1 건)
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A comprehensive study on a propagating buckle in externally pressurized pipelines
Jianghong Xue,Neng Gan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
Buckle propagation is a unique phenomenon occurring in deep-sea pipelines. In previous works, this phenomenon was investigated usinga ring technique in which the pipeline was assumed to be in plane strain condition and the energies absorbed in membrane stretchingand longitudinal bending were ignored. This paper presents a three-dimensional analysis of the buckle propagation phenomenon with anemphasis to address more complete factors that were not accounted for in the ring analysis. The analyses are based on the available solutionsof the transition zone obtained in our previous works. A comprehensive mechanism for buckle propagation phenomenon is describedfrom the point view of plastic stability theory for shells which enables the incorporation of the effects of transverse and longitudinalbending, membrane stretching and material strain hardening. The nondimensionalized buckle propagation pressure is represented interms of yield coefficient, strain hardening coefficient and membrane stretching factor. It is found that a buckle once initiated in a pipelinemay or may not propagate along the pipeline depending on its radius-to-thickness ratio. By comparing with various experimentalresults the theoretical predictions from this analysis are shown to provide very accurate estimations of the buckle propagation pressure fordifferent materials with diverse geometric parameters and material properties. This paper points to the need for more complete informationregarding the effects of transverse bending, membrane stretching and material strain-hardening on the buckle propagation pressure. Upon the requirement of application variations of the yield coefficient, strain hardening coefficient and membrane stretching factor withrespect to the radius-to-thickness ratio are sketched out. This eliminates the need for recourse the curves and allows a fast and convenientresolution of buckle propagation pressure for certain pipeline. Most importantly, the present analysis offers the potential for future designof pipelines being at once more rationally and parametrically complete, and yet compact and simple to apply.
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