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RISS 인기검색어
- 검색키워드
- 저자 : Guangyao Cui (검색결과 4 건)
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Cui Xiangyang,Zheng Gang,Li Guangyao 한국소성가공학회 2010 기타자료 Vol.2010 No.6
This paper presents an efficient triangular shell element based on edge-based smoothing technique for sheet forming simulation. The sheet model is first discretized into a set of triangular elements and linear shape functions are used. The smoothing domains associated with the edges of the triangles are then further formed and an edge local coordinate system is introduced for performing strain smoothing operations. The discretized system equations are obtained using the smoothed Galerkin weak form, and the numerical integration is applied based on the edge-based smoothing domains. The smoothing operation can provide a much needed softening effect to the FEM model to reduce the well-known “overly-stiff” behavior caused by the fully-compatible implementation of the displacement approach based on the Galerkin weak form, and hence improve significantly the solution accuracy. There is no extra sampling point introduced to evaluate the stiffness matrix in present formulation. Hence the present method is very simple and can be easily implemented. Some academic examples and benchmark tests show the accuracy and efficiency of the proposed element.
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Junjia Cui,Xushi Huang,Dongying Dong,Guangyao Li 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Magnetic pulse compaction (MPC) technology had unique compaction advantages compared to traditional powder compactionmethods. In this study, the pure copper compacts have been consolidated by MPC technique. The effect of dischargeenergy on the microstructures, relative density, micro hardness, strain and stress of copper compacts were analyzed viaoptical microscopy, scanning electron microscopy, hardness tester and FEM simulation. The relationship between dischargeenergy and spring back was analyzed by numerical calculation. Results showed that the MPC method had the advantages torefine powder particles. The relative density of copper compacts reached 96% when the discharge energy was 9 kJ. Stressconcentration was occurred at the upper edge of the powder body, and propagated to the upper center, lower edge and middleposition of the powder body. The powder body could have a uniform strain distribution in a short period of time whenthe discharge energy was greater than 7 kJ. There was a linear relationship between the relative density and the logarithm ofVickers hardness. The axial and radial spring back both increased with the increase of discharge energy. When the dischargeenergy was 9 kJ, the axial and radial spring back was 2.36% and 0.42%.
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Jianfei Ma,Guangyao Cui,Shaohui He,Xiaokang Ling 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.10
Constructing super-sized quasi-rectangular pipe-jacking tunnels beneath high-speed railways presents a significant risk to both the railways and the tunnels. This paper uses expert inquiry, numerical simulation, fuzzy comprehensive evaluation, and on-site monitoring to assess and control risks for constructing a super-sized quasi-rectangular pipe-jacking tunnel project beneath high-speed railways. An assessment system including 18 factors from 6 aspects is built by integrating existing literature, expert consultation, and causality analysis. As the insufficient number of projects, the Analytic Hierarchy Process (AHP), Fuzzy Comprehensive Evaluation Method (FCEM), Delphi method, and numerical simulation are employed to establish a risk assessment model. The pre-support roof construction (P-SRC) technology is proposed to control tunnel construction risks. The actual scenario on site examines the validity and practicality of the evaluation model and control measures. The results indicate that the super-sized quasi-rectangular pipe-jacking tunnel sections for planned and operational high-speed railways belong to the level I risk, requiring risk reduction measures. The artificial borehole piles + D-shaped beams scheme and pile-plate structure scheme decrease the construction risk from level I to IV, and the evaluated risk results and control effect are in good agreement with actual construction conditions. The proposed risk assessment method and control technology are reasonable and reliable, providing a scientific reference for similar projects.
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Dong An,Zheng Chen,Guangyao Cui 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.7
Due to the space utilization and support requirements of shallow-buried rectangular tunnel in city, special treatment is needed for lining structure. More stable structure should be taken to prevent the influence of strong earthquake on the rectangular section of tunnel. ABAQUS finite element model was established to clarify the influence of fiber-reinforced concrete lining structure on the seismic performance of urban shallow-buried rectangular tunnel. Based on the design and engineering conditions, firstly C25 concrete was applied as lining structural materials. Then, the seismic effects of steel fiber concrete (SFRC) and steel-basalt hybrid fiber concrete (SBHFRC) as the lining structure are compared and analyzed. The influence of internal force is studied and compared by calculating the safety factors of the tunnel lining structure under the above three conditions. The results show that the seismic performance of the lining structure using SFRC is better than that of using SBHFRC. The results have important reference value for the seismic fortification design and related research of urban shallow-buried rectangle tunnels in strong earthquake area.
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