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RISS 인기검색어
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- 저자 : Wenxian Tang (검색결과 3 건)
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Qiang He,Wenxian Tang,Jian Zhang,Xiaorong Wang 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
Hexagonal honeycombs have exhibited significant advantages in energy absorption and they are increasingly used as absorbers under crush conditions. The in-plane crushing process of imperfect hexagonal honeycombs with concentrated rigid inclusions defects is simulated using finite element simulations. In each case, a constant velocity is applied to an impact plate which then crushed the honeycomb. Simulation results indicate that the defect location has a great influence on the deformation modes, especially at low and moderate velocity. After analyzing the apparent reflection about dynamic response at the impact end, the respective influences of local fraction of inclusions and foil thickness (relative density) on the crushing plateau stress on account of the crushing velocity are further discussed. Furthermore, the energy absorption capacity under constant velocity loading is studied. Due to the distribution of the concentrated rigid inclusions defects, the energy absorption can be controlled effectively.
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Polymerization of Vinyl Acetate Initiated by Hydrosilane in the Presence of Platinum Complex
Ming Yuan,Wenxian Zhu,Jiaxing Lv,Panpan Zhang,Huadong Tang 한국고분자학회 2021 폴리머 Vol.45 No.3
In this work, a series of hydrosilanes including phenylsilane, diphenylsilane, triethylsilane (TES), and tris(trimethylsilyl)silane combined with catalytical amount of platinum complex such as dichloro(1,5-cyclooctadiene) platinum (COD) and dichloro(dicyclopentadienyl)platinum have been used to initiate the polymerization of vinyl acetate (VAc) at 70-95 ℃. An ultrahigh molecular weight PVAc with number-average molecular weight (Mn) up to 1.17×10<SUP>6</SUP> Da and polydispersity index (PDI) of 2.59 has been synthesized using TES as an initiator in the presence of 9.7 ppm of COD. A kinetic study indicates that the polymerization at VAc/TES/COD molar ratio = 3.0×10<SUP>5</SUP> : 60 : 1 smoothly reached 81.0% conversion in 28.0 h at 85 ℃, producing PVAc with Mn increasing linearly from 1.41×105 to 6.01×10<SUP>5</SUP> Da with the increase of monomer conversion. A mechanistic investigation revealed that COD was firstly reduced by reductive TES, producing Pt nanoparticles and corresponding silane radicals to initiate the polymerization of VAc.
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The Research of Platform Vibration Characteristics based on Numerical Wave Simulation
Zhang, Huixia,Huang, Weiqing,Yang, Quan,Lu, Long,Tang, Wenxian,Lyu, Sungki 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.3
Fluent and ANSYS Workbench platfrom are applicated to make a research on the time course of jack-up drilling platform under extreme wave load. Track free surface with UDF macro and VOF method. Establish numerical wave flume with the function of wave generation and wave absorbing to simulate limit value linear wave and third order Stokes wave. Flow field physical model of jack-up drilling platfrom and trussed legs are established to study the time course of wave load under wave impact. Analyze wave pressure and speed distribution of the field around trussed legs and platform and calculate the stress distribution of platform structure under wave load. The calculating results of wave load will provide a basis for evaluating the influence of wave load to drilling platfrom and designing drilling platfrom rationally.
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