Entity

Time filter

Source Type


Chen S.,East China University of Science and Technology | Li Q.,East China University of Science and Technology | Zhang Y.,Wuxi Seamless Oil Pipe Co. | An Q.,East China University of Science and Technology
International Journal of Pressure Vessels and Piping | Year: 2011

Based on elastic mechanics and by use of thick cylinder theory, this paper presents a finite element analysis model with interference fit and axial load on P-110S conic threaded connections and the tooth load distributions on contact threaded surfaces were investigated. A 2D finite element model with elastic-plastic axisymmetric contact threaded surfaces was established and the tooth load distributions on its thread teeth were analyzed under different interference fit and axial load. Results for the loads on every engaged tooth are obtained. These indicate that the load distribution on the engaged teeth is not uniform, with the maximum tooth load concentrated on the first three pairs or the farthest two pairs of engaged teeth from the pin end and the middle teeth only bear a very small load. Such results are identical to the practical situation and indicate that the finite element model proposed in this paper is reasonable. © 2011 Elsevier Ltd. Source


Man J.,East China University of Science and Technology | Man J.,Shanghai University of Electric Power | Zhou Q.,East China University of Science and Technology | Tao Z.,East China University of Science and Technology | And 2 more authors.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science | Year: 2014

Metal contact seals are widely used in mechanical equipment, and such sealing performance is directly influenced by the interfacial micro-contact state. In this paper, the surfaces with random roughness are simulated by an exponential autocorrelation function and root-mean-square roughness. The model of metal surface micro-contact is established. The influences of the external loads on the interfacial separation, contact area and maximum interfacial stress are investigated by means of Hertz contact theory. Calculations and investigations are carried out for a concrete sealing interface. The variations of the interfacial separation, contact area and interfacial stress with the external applied loads are investigated with the two surfaces of the same and different root-mean-square roughness, respectively. Meanwhile, the concrete variation curves are obtained. Furthermore, the obtained variation curves are analysed in detail. © IMechE 2013. Source


Zhou Q.,Lanzhou University of Technology | Jia J.-G.,Lanzhou University of Technology | Zang S.-J.,Lanzhou University of Technology | Zhao H.-S.,Wuxi Seamless Oil Pipe Co. | Wu H.-T.,Lanzhou University of Technology
Cailiao Gongcheng/Journal of Materials Engineering | Year: 2012

Based on the modification principle and adjustment of materials order degree, four kinds of Fe 3Si based ordered alloys alloyed with Cr and Al were prepared by vacuum arc melting and annealing. Meanwhile, the alloys were characterized by XRD, SEM, EPMA, and the degree of ordering of the ordered phase was evaluated by the long range order (LRO) parameter. The result shows that four kinds of ordered intermetallics have different microstructure. With the decrease of Si content, the degree of order decreases. The effect of Al and Cr alloying plays a promoting roles in the decreasing tendency of degree of order. At the same content of Si, the order degree of Fe 65Si 25Cr 5Al 5 is lower than that of Fe 3Si. The order degrees of Fe 65Si 25Cr 5Al 5 and Fe 3Si are 0.658 and 0.796 respectively. Source


Chen S.,East China University of Science and Technology | Li Q.,East China University of Science and Technology | Zhang Y.,Wuxi Seamless Oil Pipe Co. | An Q.,East China University of Science and Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2010

Based on elastic mechanics and by means of thick-walled-cylinder theory, this paper established a calculating model with interference fit on conic thread connections and the radial stress and deformation on contact tooth surface were obtained. As a calculation example of P-110S and using the large finite element analysis software ABAQUS, a finite element model with elastic-plastic axisymmetric contact problem was built up and the stress distribution and deformation on thread teeth were analyzed under different kinds of conditions, such as interference and interference fit with tensile load process. Source


Zhou Q.,Lanzhou University of Technology | Jia J.,Lanzhou University of Technology | Zhao H.,Wuxi Seamless Oil Pipe Co. | Zhang X.,Lanzhou University of Technology
Advanced Materials Research | Year: 2011

In the present work, intermetallics Fe3Si and Fe3 (Si1-xAlx) (x=0.33, 0.67, 0.80) produced by arc melting, were evaluated regarding the oxidation at 900°C in air. The test preformed was the isothermal and cyclic oxidation. The microstructures of oxide films were analyzed by XRD, SEM, EDS, EPMA. The result showed that the four kinds of intermetallics had good oxidation resistance at 900°C. The addition of Al element can increase the oxidation resistance of Fe3Si based intermetallics. The oxidation kinetics of the four intermetallics follows the rule of the parabola. The main oxidation product of Fe3Si is SiO 2. The kinetics of oxidation reaction is mainly controlled by Si diffusion. The oxidation product of three Al alloying Fe3Si based intermetallics is Al oxide. Al moves outward from the substrate to form a protective oxide film which restrained the diffusion of Si and Fe outward. Source

Discover hidden collaborations