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Patrick Mountapmbeme Kouotou,Guan-Fu Pan,Jun-Jie Wenga,Shi-Bin Fan,Zhen-Yu Tian 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
The effective evaluation of the catalytic performance of Co3O4 supported on an inert carrier wasinvestigated toward the deep oxidation of light olefins. Thin Co3O4 films were deposited on grid mesh ofstainless steel using one-step chemical vapor deposition method. The as-deposited materials werecharacterized in terms of structure, morphology and composition. Co3O4 crystals with cubic spinelstructures composed of Co2+, Co3+ and nucleophilic oxygen species (O2 ) were obtained. The catalyticresults indicated that Co3O4 supported on steel mesh was highly active to enable the completeconversion of C3H6 and n-C4H8 with a Mars-van Krevelen type mechanism.
High Precision FE Modeling for Predicting Inner Polygon Defect of Hot Rolled Seamless Steel Tubes
Yong-Zheng Jiang,Yong-Zheng Jiang,Xiao-Ping Zhang,Kuan-Fang He,Guan-Fu Bin 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.11
A high precision FE model is the key basis for cause analysis and overcoming of inner polygon defect of hot rolled seamless steel tubes. In this paper, the viscoelastic-plastic FEM is adopted in order to develop a high precision FE model for predicting the defect of inner polygon. Mechanical properties of tube material under rolling environment is obtained through five sets of high temperature compression tests, thus the viscoelastic-plastic constitutive equation of tube material is regressed and agrees with the tests results. Heat transfer boundary conditions, roll constant speed and contact friction boundary conditions are applied simultaneously on the FE model and thermo-mechanical coupled explicit algorithm is adopted for solution. The precision of the FE model is verified through industry experiments. Results shows the simulated inner wall shape is in good accordance with the experiment results, and the friction force, stress, strain and temperature distribution in the deformation zone are also discussed. It can be concluded that the viscoelastic-plastic FE model is of high precision and can be applied for better analysis of the hot rolling results.