Abstract. Based on the double ellipsoid thermal source model, the numerical analysis model of the 3d transient welding thermal process of the GTAW welding stainless steel 0Cr18Ni9 thin plate was established. The method for determining the heat source distribution parameters by the calibration tool of SYSWELD software is given. The finite element solution of the molten pool is compared with the experimental results, and the calculated results are in good agreement with the measured results. PrefaceGas Tungsten Arc Welding is commonly used in the automatic welding and robot welding of one of the welding process. Some researchers have established corresponding models for the two-dimensional transient or 3d quasi-steady state problems of fixed arc [1,2]. And most of them are in planar heat source mode, and more and more researchers are paying attention to the 3d transient behavior of welding pool and have achieved good results [3].Is proposed in this paper the double ellipsoid heat source model can well reflect the power density distribution of GTAW welding arc, because there is no clear formula to determine the double ellipsoid body heat source distribution parameter value, how to choose, need a lot of trial process to get reasonable distribution of heat source parameter value. This paper analyzes reasons for this, gives the application of SYSWELD software calibration tool to determine the double ellipsoid body heat source distribution parameter of the method; Using correction moving double ellipsoid heat source model, under the action of the arc movement of GTAW welding 3 mm thick stainless steel sheet welding process has carried on the finite element simulation, predict the three-dimensional transient when plate welding molten pool in the shape of dynamic evolution, and test verification. Mathematical Model 2
Based on the Landau-Khalatnikov equation of motion, the switching dynamic behaviors, (including the average polarization, switching time, switching current and coercive field) of a ferroelectric bilayer film with a surface transition layer within each constituent thin film and a ferroelectric interfacial coupling between two thin films have been investigated. Results reveal that there is a competitive mechanism in the bilayer film, the action of surface transition layer and the interfacial coupling. The abnormal behavior is discovered in the polarization reversal process of the bilayer film, which can be attributed to the competition between the surface transition layer and the interfacial coupling. The combined action of surface transition layer and interfacial coupling plays a decisive role on the dynamic properties of a ferroelectric bilayer film.
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