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- 저자 : Peiyao Chen (검색결과 3 건)
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Peiyao Chen,Binghe Chen,Ben Qin,Jiangqiong Wang,Qihuang Deng,Yefeng Feng 한국고분자학회 2021 Macromolecular Research Vol.29 No.9
Present work aimed at studying the effect of montmorillonite (MMT) on dielectric and conductive properties of composites based on polymer/hafnium carbide (HfC) mother composite system. Polymer/HfC/MMT composite films based on double-filler modification strategy were prepared by solution cast. To obtain control group, binary polymer/HfC composite films were prepared. MMT ceramic had excellent insulation property, which could suppress interface leakage current and thus reduce dielectric loss of composites. Compared with binary system, ternary system could show better overall electric features including mildly reduced permittivity, obviously reduced dielectric loss and conductivity. Optimized ternary composite bearing 3 wt% HfC and 3 wt% MMT exhibited a high permittivity of 34, low dielectric loss of 0.33 and low conductivity of 5.5 × 10-7 S m-1 at 100 Hz. This research might enable the fabrication of advanced composite dielectrics.
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Peiyao Zhang,Quanquan Guo,Sen Pang,Yunlun Sun,Yan Chen 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1
The high-temperature gas-cooled reactor pebble-bed module project is the first commercial Generation-IV NPP(Nuclear Power Plant) in China. A new joint is used for the vertical support of RPV(ReactorPressure Vessel). The steel corbel is integrally embedded into the reactor-cabin wall through eightasymmetrically arranged pre-stressed high-strength bolts, achieving the different path transmission ofshear force and moment. The vertical monotonic loading test of two specimens is conducted. The resultsshow that the failure mode of the joint is bolt fracture. There is no prominent yield stage in the wholeloading process. The stress of bolts is linearly distributed along the height of corbel at initial loading. Asthe load increases, the height of neutral axis of bolts gradually decreases. The upper and lower edges ofthe wall opening contact the corbel plate to restrict the rotation of the corbel. During the loading, thepre-stress of some bolts decreases. The increase of the pre-stress strength ratio of bolts has no noticeableeffect on the structure stiffness, but it reduces the ultimate bearing capacity of the joint. A simplifiedcalculation model for the elastic stage of the joint is established, and the estimation results are in goodagreement with the experimental results
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Modulus of Subgrade Reaction for Circular Tunnels considering Bedrock and Ground Surface
Wusheng Zhao,Peiyao Xie,Weizhong Chen,Changkun Qin 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
The modulus of subgrade reaction is a key parameter used in tunnel design. However, the existing analytical relations for determining the modulus mainly focus on deep tunnels in the homogeneous ground. Therefore, the complex variable method was used to develop analytical solutions for calculating the modulus of subgrade reaction for deep circular tunnels close to bedrock and shallow circular tunnels under uniform and oval deformation patterns. Subsequently, the analytical solutions were validated by comparing them with numerical solutions. At last, parametric studies were conducted to analyze the impacts of the bedrock and ground surface on the modulus of subgrade reaction. The results show that the modulus increases substantially near the bedrock and decreases slightly away from the bedrock, while the ground surface has the opposite effect. In addition, the effects of the bedrock and the ground surface on the radial modulus are more significant than that on the tangential modulus. Furthermore, the results confirm the effect of the tunnel deformation pattern on the modulus of subgrade reaction. The analytical solutions may be used for obtaining the approximate magnitude of the modulus of subgrade reaction in the structure design of shallow tunnels and deep tunnels close to bedrock.
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