EXPERIMENTAL SIMULATION ON CONTROL ROLLING PROCESS OF 6201 ALUMINUM ALLOY

１ＩＮＴＲＯＤＵＣＴＩＯＮ６２０１Ａｌｕｍｉｎｕｍａｌｏｙｉｓｕｓｅｄｆｏｒｏｖｅｒｈｅａｄｃｏｎｄｕｃｔｉｖｅｗｉｒｅ，ｗｈｉｃｈｃａｎｂｅｆａｂｒｉｃａｔｅｄｂｙｔｈｅｆｏｌｏｗｉｎｇｍｅｔｈｏｄｓ［１－４］．（１）Ｃｏｎｖｅｎｔｉｏｎａｌｐｒｏ...     

Synergistic effect between Laves phase and Zr Ni phases in Zr(MnVNi)_2 hydrogen storage alloys

１　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＡＢ２ｔｙｐｅＺｒｂａｓｅｄＬａｖｅｓｐｈａｓｅｈｙｄｒｏｇｅｎｓｔｏｒａｇｅａｌｌｏｙｓｈａｖｅｂｅｅｎｓｔｕｄｉｅｄｅｘｔｅｎｓｉｖｅｌｙｄｕｅｔｏｔｈｅｉｒｈｉｇｈｃａｐａｃｉｔｙ，ｌｏｎｇｃｙｃｌｅｌｉｆｅｔｉｍｅａｎｄｔｈｅｐｏｔｅｎｔｉａｌｔｏｂｅｃｏｍｅａｐｒｏｍｉｓｉｎｇｃａｎｄｉｄａｔｅｆｏｒＡＢ５ｔｙｐｅａｌｌｏｙｓｉｎＮｉＭＨｂａｔｔｅｒｉｅｓ［１，２］．ＵｎｌｉｋｅｔｈｅｃｏｍｍｏｎＡＢ５ｔｙｐｅｈｙｄｒｏｇｅｎｓｔｏｒａｇ…     

Solid-liquid Extraction Spectrophotometric Determination of Copper with 2,9-dimethyl-1,10-phenanthroline

Solid-liquid extraction deterndnation andseparation of metal ions has been well devel-oped in recent year[l--4]. The deterndnation oflanthanides and precious metals were exten-siveIy investigated by using solid diluent sol-vent in our previous works[5--7]. These previ-ous studies indicate that high temPerature andlow melting point solvent give a lot of advan-tages which is absent in room temPeratllrecommon liquid-liquid extraction.Copper(I) and neo-cuproine can stronglyform a yellow colored …     

Preparation and Conductivity of Triheteropoly Tungstozincoaluminic Acid

Heteropoly acids (HPA) have been widelyused as e1ectrochroAnc and conducting materi-als, new modified electrodes, comPonents inconversion of solar energy, new materials foroxidation catalysis, cormsion resistant coatings,dyes or pigments, sorbents of gases, and cationexchangers etc. according to their unmatchedmolecular and electronic simctural versatility[l--4]. Because of their high-proton conductivi-ties, they are of special interest as new materi-a1s. There are two kinds of protons in th…     

空·宅展馆

保持一个纯粹的直线几何形状,而建筑的边界是不规则的,大屋顶的几何形状由一系列向内倾斜的小屋顶组成。屋顶轮廓在周边发生变化     

Monte Carlo study of spatial resolution of the scintillation camera

The aim of this study was to evaluate the influence of different entrance surface treatments of the scintillator on the intrinsic spatial resolution of a scintillation camera.The primary scintillation light reflection on the entrance surface of a scintillator may be affected by the optical coating of the entrance surface,resulting in either spatial resolution or system detection efficiency degradation.A Monte Carlo simulation model,based on Geant4 codes,was developed in order to study the scintillation ligh...     

Experiment and analysis on microscopic characteristics of pedestrian movement in building bottleneck

In this paper, evacuation experiments are carried out to study pedestrian movement behaviors in building bottleneck. An image processing method based on mean-shift algorithm is used to extract pedestrian movement trajectory. Based on the extracted trajectory, we analyze the microscopic movement characteristics of pedestrians such as lane formation, change of velocity and distance between two sequential pedestrians. A pedestrian lane is a group of pedestrians moving in a column. The lane formation is verifie...     

Study on stable delivery of charged uniform droplets for freeform fabrication of metal parts

Electrostatic delivery of charged uniform metal droplets is a novel method to deposit metal parts with short process period and low cost. But the delivery process is unstable and delivery accuracy of charged droplets deteriorates because of actions of mutual interactions of closely charged droplets. A droplet generator with droplet charging and deflecting system has been established to find out the way for stably and accurately deflecting droplets. The parameters for generating uniform droplets were first s...     

Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets

The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy tubes.In order to study and develop advanced NC bending technology,it is necessary to understand the bending performance of medium strength TA18(Ti-3Al-2.5V,ASTM Gr.9) titanium alloy tubes during NC bending under different die sets.This paper focuses on the bending performance of medium strength TA18 tubes under differe...     

Formation of internal cracks in steel billets during soft reduction

To investigate the formation of internal cracks in steel billets during soft reduction, fully coupled thermo-mechanical finite element models were developed using the commercial software ABAQUS, also casting and soft reduction tests were carried out in a laboratory strand casting machine. With the finite element models, the temperature distribution, the stress and strain states in the bil-let were calculated. The relation between internal cracks and equivalent plastic strain, as well as maximal principal stress was ana-lyzed. The results indicate that tensile stresses can develop in the mushy zone during soft reduction and the equivalent strain nearby the zero ductility temperature (ZDT) increases with decreasing solid fraction. Internal cracks can be initiated when the accumulated strain exceeds the critical strain or the applied tensile stress exceeds the critical fracture stress during solidification.