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Li F.,Shenyang University of Technology | Wang X.-G.,Shenyang University of Technology | Liang X.-K.,New Northeast Electrical Shenyang High Voltage Switchgear Co. | Chen L.-J.,Shenyang University of Technology
Chinese Rare Earths | Year: 2015

In order to explore the influence of rare earth Er on the cyclic stress response behavior and low-cycle fatigue life of as-extruded Al-0.8% Mg-0.6% Si alloy, the strain controlled low-cycle fatigue tests were performed at room temperature. The results indicate that both extruded Al-0.8% Mg-0.6% Si and Al-0.8% Mg-0.6% Si-0.5% Er alloys show the cyclic strain hardening during fatigue deformation. Due to the addition of 0.5% Er, the cyclic deformation resistance of the Al-0.8% Mg-0.6% Si alloy gets significantly enhanced, while the low-cycle fatigue life of the Al-0.8% Mg-0.6% Si alloy is decreased. ©, 2015, Editorial Office of Chinese Rare Earths. All right reserved. Source


Sui S.,New Northeast Electrical Shenyang High Voltage Switchgear Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

Stress induced deformation often happens in machining the thin-walled piston cylinder for vacuum casting line of epoxy resin, which results in difficulty in machining this type of parts. The author analyzed the machining process of piston cylinder, designed machining route of important surface, refined the machining and heat treatment processes, and designed grinding clamp. As a result, the measurements of the machined piston cylinder's size, shape and position tolerances, and surface roughness met the requirements in the drawings, thus the machining quality of the parts is guaranteed. Source


Sui S.,New Northeast Electrical Shenyang High Voltage Switchgear Co.
Gaoya Dianqi/High Voltage Apparatus | Year: 2013

Because of bowl insulator casting mold's dimensions is very big, and the mold cavity is high precision, so it's difficult to guarantee the manufacture quality. According to the machining process characteristics, the author designs the bulge mold processing routes, the operation drawing of rough turn, the coordinate position drawing of finish turning and the unity proof plate, and through the proper selection of machines equipment, cutting tools and cutting parameters process measures to guarantee the processing quality of the bulge model cavity. When the parts processing is completed by the full range of detection, the size, shape and position tolerances and surface roughness fully meet the requirements of the drawings, through trial pouring test, the full set of casting mold fully meet quality. Source


Che X.,Shenyang University of Technology | Liang X.,New Northeast Electrical Shenyang High Voltage Switchgear Co. | Chen L.,Shenyang Aerosun Futai Expansion Joint Co. | Chen L.,Shenyang University of Technology | Li F.,Shenyang University of Technology
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2014

The Al- Si- Cu-Mg cast aluminum alloys have high mechanical properties and good cast performance. Due to their excellent comprehensive properties, the Al-Si-Cu-Mg cast aluminum alloys have wide application, and have become one of the most important structural materials applied in the equipment manufacturing industry. Actually, many key components in practical engineering application are often subjected to the alternating load, and thus the fatigue failure has become an important factor which concerns the safety and economy for those structures used in various engineering fields. Although some researches for the fatigue behavior of aluminum alloys have been performed, mainly focus on the regularity understanding. Especially, the influences of rare earth elements and heat-treat condition on the low-cycle fatigue behavior of aluminum alloys have not been comprehensively revealed. Obviously, the investigation concerning the microstructure and fatigue property of the Al-Si-Cu-Mg cast aluminum alloys can not only provide the theoretical basis for the development of new type cast aluminum alloys but also the reliable theoretical foundation for the safety design and reasonable use of these alloys. In order to determine the influence of rare earth element Sc on the low-cycle fatigue behavior of casting Al-9.0%Si-4.0%Cu- 0.4%Mg alloy with T6 treated state, the cyclic stress response behavior, fatigue life behavior and cyclic deformation mechanism of the Al-9.0%Si-4.0%Cu-0.4%Mg(-0.3%Sc) cast aluminum alloys with T6 treated states under low-cycle fatigue loading condition were investigated. The results show that at the low total strain amplitude, the Al-9.0%Si-4.0%Cu-0.4%Mg alloy exhibits the cyclic strain hardening during whole fatigue deformation, while the Al-9.0%Si-4.0%Cu-0.4%Mg-0.3%Sc alloys exhibit the cyclic strain hardening in the initial stage of fatigue deformation and then the stable cyclic stress response in the later stage of fatigue deformation. At the higher total strain amplitudes, the Al-9.0%Si-4.0%Cu-0.4%Mg(-0.3%Sc) alloys exhibit the cyclic strain hardening. The addition of Sc can effectively enhance the cyclic deformation resistance and prolong the fatigue lives of the Al-9.0%Si-4.0% Cu-0.4%Mg alloy with T6 treated state. At the lower total strain amplitudes, the cyclic deformation mechanism of the Al-9.0%Si-4.0%Cu-0.4%Mg(-0.3%Sc) alloys with T6 treated state is the plane slip, while at the higher total strain amplitudes, the cyclic deformation mechanism becomes the wavy slip. © Copyright. Source


Liu X.,Shenyang University of Technology | Song C.,Shenyang University of Technology | Cao Y.,Shenyang University of Technology | Leng X.,Shenyang University of Technology | Zhao Y.,New Northeast Electrical Shenyang High Voltage Switchgear Co.
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2010

Based on the numerical computation of 2D compressible, viscous and turbulent gas flow physical-mathematical model for a extra high voltage SF 6 circuit breaker (EHV SF 6 CB), the aerodynamic behavior and pressure characteristics under no load interrupting have been obtained using the improved combination method of FVM and TVD scheme. And the pressure time series of different points, the phase space reconstruction of pressure time series have been achieved. Moreover, the embedding dimension and delay time are obtained using C-C method. And the largest Lyapunov exponent (LE) of the pressure time series using small data sets method has been calculated, which illustrates that the system exists chaotic behavior. Furthermore, the principal component analysis (PCA) shows that, during no load interruption, the turbulent gas flow pressure time series is a chaotic series. ©2010 IEEE. Source

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