Applied Mechanics and Materials Vols. 543-547

Abstract: The worldwide production of more than half of the material to be processed into sheet metal. Therefore, improving the corresponding forming technology and manufacturing level is a subject of universal significance ^[1,. Sheet metal bending is the technology method that is using high energy laser beam scanning form when the surface of the sheet metal thermal stress caused by non-uniform temperature field to implement plastic forming. Compared with the conventional molding method, the technology neednt die and external force, it is large production flexibility, low cost, and high precision molding^[3,4]. As a new plastic molding method, a laser bending technology has been widespread concern of many scholars at home and abroad^[5]. In this paper that using ABAQUS for ST14 were simulated scanning laser bending. In the simulation, the simulation using shell elements to reduce the amount of computation and shorten the calculation time,finnally use the shell elements replace the solid elements simulations to provide evidence

Abstract: We present an investigation of electronic structure and dynamic properties of SrCl₂ under high pressure using density functional theory (DFT). The calculated electronic structures show that SrCl₂ is an insulator with a band gap of 5.22 eV at ambient conditions. The band gap initially increases with pressure, then decreases upon further compression leading to band overlap metallization. The pressure of metallization is predicted to be 102 GPa. The calculated phonon curves indicates that the sequence of the pressure-induced structural transition of SrCl₂ is from fluorite structure (Fm3m) to orthorhombic structure (Pnma), then to hexagonal structure (P6₃/mmc).

Abstract: Aiming at the finishing of small hole of difficult-to-machine materials such as carbide, etc, this paper presented a new low speed electrical discharge grinding (EDG-LS) processing method, in which a machine tool accessory was equipped on WEDM-LS to realize the grinding process. Through the analysis of orthogonal test, the key factors affecting technological effect were discussed in the processing of EDG-LS, and the influence of average gap voltage, average gap current and workpiece speed on machining dimension and surface quality were elaborated respectively. It is of importantly theoretical and practical significance to seek better technology parameter in EDG-LS.

Abstract: In this paper, the spin transport properties of the coblt dimers parrallel to the transport direction and perpendicular to ransprot direction are investigated by using the first principle analysis. Calculation shows that both the coblt dimers parrallel to the transport direction and perpendicular to ransprot direction give obvious spin polarized density of states and current. It is found that the dimer parrallel to the transport direction have larger spin polarization current.The spin polarized efficiency for the parrallel dimer increase steadily with the increase of the bias voltage. But the the spin polarization for the transverse dimer changes greatly.

Abstract: This paper demonstrates the deposition of barrier layers and seed layers in TSV for 3D package. The high aspect ratio through silicon via sputtering process uses the magnetron-sputtering of Au. In order to achieve the continuous coverage of thin film on the sidewall and bottom of vertical microvias, the sputtering and anti-sputtering process was optimized. The impact of thickness of the seed layer and the gas pressure of the chamber on the coverage of the seed layers are discussed. The continuous seed layers and barrier layers on in the micro-vias with aspect ratio 3.5 can be achieved at low cost.

Abstract: Cold rolling rules according to the fixed incoming crown distribution of each crown control, raw material convexity fluctuations will destroy convex degree program, light is left with the residual stress, heavy waves. This paper discusses test incoming convexity, convexity control allocation method of residual stress.

Abstract: In this paper, we have developed an empirical formula describing the equation of state of argon fluid using cluster expansion technique and commonly used force parameters. To test the reliability of the formula, we have further simulated the equation of state for argon at corresponding states employing molecular dynamic method. The comparisons have shown that the empirical formula gives much better prediction than that from the simple form equation of ideal gases and the inclusion of the third virial terms in expansions is prominently important.

Abstract: The recovery of copper from smeltery furnace slag by flotation has been studied. By analysis the slag containing 1.61% copper and 27.80g/t silver is available to recovery. The effective factors such as particle size, the amount and type of collector were examined. The combination of the collectors was also examined. With the process utilized in this work, a copper concentrate of 26.47% Cu with a recovery of 78.85% is produced. The associated silver is mostly concentrated to the copper concentrate, and the silver recoveried in the copper concentrate is 97.57%.

Abstract: There are abundant CBM (Coalbed Methane) in China. These CBM has caused a remarkable problem to the coal-mining in China. In order to improve the structure of Chinese energy and eliminate the risk of coal mine gas, the relevant industries and sections have implemented many explorations in CBM enriched areas. With great achievements, there are many important problems in the actions of CBM exploitation. The disadvantageous interaction of the surface CBM well and the later coal mining has been ignored at all. There are many disadvantages and defects. To solve these problems and eliminate or weaken the disadvantageous, the scientific and reasonable design of surface CBM well location is an important step. With the thinking of surface condition, coal mining plan, the arrangement of coal mine laneway, the direction and scale of the in-situ stress, and thinking more about the negative influence to and of surface CBM well, according to the theories of mining dynamics, mining engineering, mining geomechanics, and the CBM engineering, the design theory of the surface CBM well net can be studied. Finally, the arrangement principle of CBM product well in coal field is presented. The existing or future coal pillar will be a critical location for the surface CBM well location.

Abstract: With the increase of the span of suspension bridge, the weight of the main cable increases, and the safety margin becomes smaller. Thus high accuracy is necessary for the construction control analysis of suspension bridges. The traditional finite element software cannot meet the accuracy requirement because of temperature, cable saddle and other factors, which influence the construction control. Based on the modified segmental catenary method, this paper has come up with a fine analysis method for the construction control of suspension bridges. And a software program called ZambisSC has been developed using object-oriented programming language combined with a number of the latest software development technologies. Compared with the monitoring results of Nancha suspension bridge in Guangzhou, China, it shows that ZambisSC can predict the main cable shape with high accuracy.