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RISS 인기검색어
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- 저자 : Lipo Yang (검색결과 3 건)
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Anisotropy evolution of wide magnesium alloy foils during continuous electroplastic rolling
Lipo Yang,Hailong Zhang,Gengliang Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
Anisotropy or brittleness poses an obstacle to the rolling of wide magnesium alloy foils, particularly those with a thickness of 1.0 mm. To address this problem, a special electroplastic rolling (EPR) process was developed to provide a better method than traditional isothermal heat treatment. Actual measured results showed that the pulse current with high energy could rapidly adjust high brittleness and severe anisotropy. This condition was helpful in the plasticity and rollability of wide magnesium alloy foils during continuous EPR process. Finally, a 0.13 mm-thick magnesium alloy foil was successfully rolled through continuous EPR processes without any intermediate annealing or reheating in the furnace. Evidently, the developed method contributed to the best matching conditions between the pulse current and deformation parameters along different directions. Therefore, EPR is a promising technology for changing the anisotropy or brittleness of wide magnesium alloy foils online.
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Performance Analysis of Wide Magnesium Alloy Foil Rolled by Multi-Pass Electric Plastic Rolling
Lipo Yang,Hailong Zhang,Gengliang Liu 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
Wide magnesium alloy foil is usually difficult to roll due to severe anisotropy or texture. It has become the biggest obstacle to the traditional rolling process, although it can be realized through some special methods. Low efficiency and high cost limit its application. Aimed at this problem, a multi-pass electric plastic rolling process was designed to successfully roll the magnesium alloy foil from 1.0 to 0.13 mm. According to actual test results, the anisotropy and properties of magnesium alloy foil were analyzed when the pulse current densities were adjusted. Under the same temperature as the isothermal rolling process, the pure electric effect could contribute to remarkably improving the plasticity and rollability of magnesium alloy foil. Thus, it could minimize the action of Joule heat as much as possible to avoid surface oxidation and grain growth. In addition, the size effect of magnesium alloy foil should be considered for the electric plastic rolling. Practical measured data verified that varied pulse current densities played important roles in the performances of wide magnesium alloy foil when the grain size and anisotropy were online adjusted by the synergy of electric plastic effect and reduction rate.
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Xue Li,Xueer Chen,Yikang Yang,Lipo Mo 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
This paper studies consensus problems of high-order heterogeneous continuous-time networks with bounded communication delays and dynamically changing digraphs. The heterogeneous continuous-time networks consist of different order agents from first-order to lth-order agents, where different order networks correspond to different linear consensus protocols. In order to use the properties of Metzler matrix with zero row sums, we make model transformations of system matrix. Giving some restrictive conditions, we obtain the sufficient condition for consensus problems of heterogeneous networks with varying bounded communication delays. Although each communication graph may have no spanning trees, all agents of high-order heterogeneous networks can reach stationary consensus with varying bounded communication delays and dynamically changing digraphs. Finally, we give an example to validate the correctness of our obtained results.
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