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Casting product performance depends on material, flow, Process Temperature, Solidification, Shrinkage and residual stress. In a casting process, not all available resources are utilized effectively which results in low quality of casting, defects and metal wastage. Physics based modeling ... Mehr lesen
In this paper describes an original method for indirect measurement of the vapor pressure and temperature in the keyhole in electron beam welding. This method is based on the determination of the concentration of chemical elements in the vapor above the welding zone. Taking into account ... Mehr lesen
连续纤维增强金属基复合材料（Continuous Fiber Reinforcement Metal Matrix Composites）因其优异的性能而在汽车领域航空航天领域、兵器武装领域及电子及光学领域备受关注。但是，目前其制备工艺的不成熟，使得产品存在较多的空隙缺陷，对材料性能造成不良的影响，而压力浸渗制备的FRM相对致密、缺陷少而具有广阔的发展前景。本文以FRM的压力浸渗制备工艺为研究对象，利用Comsol Multiphysics软件进行二维数值模拟计算，分别研究了流体动力粘度、入口压力以及纤维排布方式等对渗流过程的影响，并判断出孔隙高频出现的区域 ... Mehr lesen
Laser direct deposition is a process, different from molding or machining, which allows the producing of fully densified and operational components. This technique involves injecting metal powder through a coaxial nozzle into a melt pool obtained by a moving laser beam. The final object ... Mehr lesen
In “Micro-Electro-Mechanical-Systems” shortly known as MEMS, one of the most important and effective principle of creating transduction of electrical power to displacement force is thermal expansion. A slim beam of MEMS material, typically Silicon, is heated by the application of ... Mehr lesen
One of the challenges associated with the wire-arc additive manufacture (WAAM) of metals is to provide adequate inert gas shielding, not only for the molten pool, but also for the long reactive metal surface that follows it. For Ti-6Al-4V, it has been shown that increased levels of ... Mehr lesen
Selective Laser Melting (SLM) offers great potential for future manufacturing technology. In order to extend its applicability for the processing of high melting materials like molybdenum fundamental process understanding is required. This can be obtained by multiphysical simulations ... Mehr lesen
The induction heating coils used in the plutonium casting furnaces at the Los Alamos National Laboratory are studied here. A cylindrical graphite test article has been built, instrumented with thermocouples, and heated in the induction coil that is normally used to preheat the molds ... Mehr lesen
The physics of rotating cups and disks is an important research subject in many areas of engineering. The rotating cup/disk has been employed in many industrial applications such as spin-coating of phosphor on television screens or photoresist films on silicon wafer, concentrating ... Mehr lesen
COMSOL Multiphysics® is used to simulate the transport phenomena in arc welding of Nickel to 304SS. Electric Currents (ec) and Magnetic Fields (mf) are used to solve for the Lorentz force which is one of the volume forces. Laminar Flow (spf) is used to simulate flow field. The Lorentz ... Mehr lesen