This paper describes a simple, compact and cost-effective capacitor pulse power supply, which only uses a single magnet coil and two capacitors of different voltage and capacity levels to form a special circuit structure. It can realize the pulse magnetic field similar to the flat top wave, so as to meet some scientific experiments that require higher magnetic field strength and stability....
Flat-top high magnetic field (FTMF) is a significant research method for physics, chemistry, biology and other scientific fields with the demands for higher magnetic intensity, longer flat-top pulsed width and a lower ripple. To meet these demands, a new FTMF system based on multiple-capacitors power supply has been realized at the Wuhan National High Magnetic Field Center in March 2021....
Large-size aluminum alloy rings are widely used as connector, transition ring and reinforcing structure in aerospace and other fields. Their performance determine the service life, assembly accuracy and reliability of the equipment directly. However, the residual stress introduced during the manufacturing process lead to the structural instability and poor mechanical properties of the aluminum...
The design and operation of resistive high field magnets require research and development in materials science, power supply engineering and instrumentation. Additionally, their energy efficient operation has become a growing constraint. The French National High Magnetic Field laboratory at Grenoble (LNCMI) is continuously improving its high magnetic field platform in order to satisfy the...
The long time thermal stability and radiation resistance of micro composite wires based on Cu-Nb alloy intended for use in devices with high neutron fluxes has been studied. We have demonstrated that for a given niobium content in the alloy (6%), it is possible to keep the ultimate tensile strength higher than 375 MPa after exposed to annealing vacuum treatment at 450 °C up to 3000...
High-speed forming can greatly improve the forming performance of lightweight sheet and tube components, and has broad application prospects in aerospace and automobile manufacturing. Electro-hydraulic forming (EHF) and electromagnetic forming (EMF) are two common high-speed forming processes. EHF utilizes the underwater discharge to produce a shock pressure as the driving force, while EMF...
Aluminum alloy rings are the key component to realize the lightweight and improve the mechanical properties of aerospace vehicles and devices. However, the residual stress is inevitably introduced by uneven heating and mechanical load having a negative effect on the dimensional accuracy and performance of the rings. Therefore, the elimination of residual stress is of great significance to...
Abstract: A special necking morphology was observed on Cu-Nb composites after the thermal compression. During the compression process under the heating temperature above 700℃, the nanofibers recrystallized rapidly, and the properties of Cu-Nb composites rapidly attenuated in the dynamic instabilty, and it was difficult to observe the rheological area. During the compression process below 700℃,...
Electromagnetic forming (EMF) is an important application of pulsed magnetic field technology, which uses a pulsed magnetic field to induce a Lorentz force on a metal workpiece, thus shaping the workpiece into desired geometry. Compared to conventional forming processes, EMF can significantly enhance the formability of materials, making it a promising option for high strength metal alloys...
Electromagnetic forming (EMF) is a metal forming process based on pulsed magnetic field. Instead of using mechanical force as in conventional forming process, EMF shall reshape metal workpiece by using a pulsed Lorentz force which is induced by a pulsed magnetic field. By adjusting the geometry configuration of the field generator (namely, coil), the Lorentz force with manifold spatial...
