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EXPERIMENTS AND SIMULATIONS OF A NEW DEVELOPED FORMING TECHNOLOGY-SHEAR-EXTRUSION PROCESS OF COMPONENTS WITH BRANCHES

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Acta Metallurgica Sinica(English Letters) 2001年第3期14卷 212-218页

作者： H.L. Yang, D.C. Kang, Z.L. Zhang, X.H. Piao and Z.D. Shi (National Die and Mold CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China) (School of Materials Sci. & Eng., Harbin Institute of Technology, Harbin 150001, China) National Die and Mold CAD Engineering Research Center Shanghai Jiaotong University School of Materials Sci. & Eng. Harbin Institute of Technology

Shear-extrusion process and its forming parameters are proposed, whilst its laborsaving characteristic is utilized to forge large-size shutoff valve bodies on the middle-due press. This new process is intended for the manufacture of large-size forged tubular components with branches on the middle-due press. Experiments are carried out and processing parameters are obtained regarding the shear- extrusion process of a large-size shutoff valve body. Deformation and metal flow in the shear- extrusion process are investigated. In order to verify the laborsaving characteristic of this new process, some contrast experiments of extrusion force are performed between shear-extrusion and upsetting-extrusion for forming tubular components with branches. Based on rigid-plastic FEM, a plane-strain model is established to analyze shear-extrusion process of tubular components with branches. The analysis results by 2-dimensions FEM are comparatively well consistent with experimental results. Both simulated and experimental results show that this new forming process is feasible for forging large-size tubular components with branches on the middle-due press.

关键词： Metal extrusion Shearing Simulation tubular steel structures

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Flexural Capacity Formula of Diaphragm-Through Joints of Concrete-Filled Square steel tubular Columns

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Transactions of Tianjin University 2017年第3期23卷 258-266页

作者： Bin Rong Rui Liu Zhenyu Li Changxi Feng Guangchao You Fafitis Apostolos School of Civil Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Coast Civil Structure Safety Ministry of EducationTianjin 300072China Department of Civil and Environmental Engineering Arizona State UniversityTempe 85287USA

Finite element analysis and parametric studies were performed to investigate the flexural capacity of the panel zone of diaphragm-through joints between concrete-filled square steel tubular columns and H-shaped steel beams. Through the comparisons of failure modes, load–displacement curves, and bearing capacity, it was found that the flexural capacity of the panel zone of diaphragm-through joints was determined by the tensile action and influence of the web of H-shaped steel beams, and the axial load should be taken into account. The steel tube and the diaphragm were the major parts of the joint that resisted the bending moment. The contribution of in-filled concrete had little influence on the flexural capacity of the panel zone of the joint and could be neglected. According to the results of these numerical studies, a formula that considered the influence of the web of H-shaped steel beams and the axial load was developed based on the yield lines in the diaphragm and the steel tube. The results of the proposed formula were in good agreement with the numerical data of this investigation. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg.

关键词： Axial loads Concretes Diaphragms steel beams and girders tubular steel structures Web crawler

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