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Numerical investigation of low cycle fatigue life for channel wall nozzles

航空动力学报 2018年第7期33卷 1553-1565页

作者： CHENG Cheng WANG Yibai LIU Yu LIN Qingguo Research and Development Center Shanghai Institute of Space Propulsion Shanghai 201112 China Shanghai Engineering Research Center of Space Engine Shanghai 201112 China School of Astronautics Beijing University of Aeronautics and Astronautics

The thermal-structural response and low cycle fatigue life of a three-dimensional(3D)channel wall nozzle with regenerative cooling were numerically investigated by coupling the finite volume fluid-thermal method,nonlinear finite element thermal-structural analysis and local strain *** nozzle had a high area ratio(nozzle exit area divided by throat area)under cyclic working *** studies were carried out to evaluate the effects of channel structural parameters such as channel width,channel height,liner thickness and rib *** showed that the integrated effects of three-dimensional channel structure and load distribution caused serious strain,which mainly occurred at the intersectant regions of liner wall on the gas side and the symmetric planes of channel and *** cooling effect and channel structural strength were significantly improved as the channel width and height decreased,leading to substantial extension of the nozzle service *** the other hand,the successive decrease in liner thickness and rib width apparently increased the strain amplitude and residual strain of channel wall nozzle during cyclic work,significantly shortening the service *** present work is of value for design of the channel wall nozzle to prolong its cyclic service life.

关键词： liquid propellant rocket engine low cycle fatigue channel wall nozzle regenerative cooling nonlinear structural analysis finite element method

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Load Distribution on the Hull-Leg Connection Components of a Jack-Up

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Journal of Shanghai Jiaotong university(Science) 2015年第6期20卷 721-728页

作者：郑轶刊张世联赖蕾 School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University

The jacking pinions and rack chocks of the fixation system of a jack-up sustain tremendous load in the elevated condition, especially when there exists a remarkable non-uniformity of the load distribution. Failures of these structural components may lead to disastrous consequence of the jack-up. Despite the importance of these components, it is difficult to give an accurate prediction of the load distribution on these components in engineering application due to the complex nonlinear interaction mechanism, which is influenced by the relative stiffness of the components, leg-guide clearance and backlash. Previous studies mainly focus on the global performance of the jack-up and pay little attention to the load distribution on the pinions and chocks. The strength of the jacking system is often guaranteed by the manufacturer for an estimate load level, which brings in uncertainty to the safety of the jack-up. The characteristics of the hull-leg interaction are discussed in this paper, and a simplified method using gap elements is proposed. The nonlinear structural analyses are carried out for a specific jack-up using the proposed method and the three-dimensional finite element method(FEM) with contact algorithm. The proposed method is proved accurate and effective for the engineering application. The characteristics of the load distribution of the specific jack-up are discussed, and the conclusions are presented.

关键词： jacking pinions rack chocks load distribution hull-leg interaction nonlinear structural analysis

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