Applied Mechanics and Materials Vol. 312

Abstract: Many salts will have decomposition reaction after being heated. The type of decomposition product and difficulty of decomposition reaction differ greatly due to the difference of salt types. To deeply understand the essence of thermal decomposition of salt, master thermal decomposition laws and use these laws to explain the reaction result and accomplish some inorganic synthetic reactions, it is necessary to make a systematic discussion and analysis on thermal decomposition.

Abstract: Nucleophilic substitution reaction is an important reaction of haloalkane. By such a reaction, halogen functional group can turn into various other functional groups. Therefore, it is widely used in organic synthesis and there are many researches on its reaction mechanism. Hydrolysis reaction of bromoalkane is especially a nucleophilic substitution reaction that is studied quite fully. This paper mainly discusses the nucleophilic substitution reaction on saturated carbon atom.

Abstract: Based on the principle of using atomistic force field, and the use of ultra-flexible multi-scale modeling techniques to predict the polycarbonate and polyimide polymer molecular structure and the elastic properties of the system. The model combines molecular modeling and nonlinear continuum mechanics basic principles, to simulate and predict the behavior of the material properties of the polymer molecular structure. For the polymer structure and properties, using a plurality of force field simulation to predict the contrast, and binding experiments measured polymer performance value, using static and dynamic molecular simulation technology for molecular mechanics energy minimization to solve.

Abstract: This paper develops a 2D finite element model for the enhanced cooling cutting of stainless steel. The enhanced cooling effect is modeled with a convective heat transfer coefficient assigned to a heat transfer window of cutting zone. Five convective heat transfer coefficients are defined to simulate different enhanced cooling effects. The simulation results suggest that increase of convective heat transfer coefficient results in a very small reduction of maximum tool-chip interface temperature, even when a very large convective heat transfer coefficient is used. In addition, no significant effect on cutting force and thrust force is observed with the increase of convective heat transfer coefficient.

Abstract: With the gradually maturing super-speed inkjet printing technology, people are pursuing steadier and higher speed as well as better quality presswork for the sake of increasing economic benefit. To provide an overview of the velocity fluctuation of the inkjet machine platform and the cyclical fluctuation of the incremental encoder, external clock and corresponding internal clock were applied separately to print the equally spaced lines under the same platform speed. Then a magnifier was used to measure distance between the lines, according to which the velocity fluctuation mentioned above can be obtained. Thus conclusion can be drawn from the fluctuation analysis that the velocity cycle of platform is 60mm, however, number of those produced by the incremental encoder is up to 3, including 60mm influenced by the platform, 300mm produced by the perimeter of encoders pressure wheel and 600mm produced by the circumference of dance roller. Furthermore, dance roller contributes more influence on narrow coated paper. Through this research, inkjet technician can do directional compensation for every factors to reduce the fluctuation.

Abstract: In the 21st century, with the further deepening of informationalization, competition among the steel industry chain has gradually upgraded to that of its e-commerce service. On the basis of bus-based industry chain theory, the architecture of integrated e-commerce platform in the steel industry chain is built. The platform involves upstream and downstream enterprises, including manufacturers, processing centers, trading companies, third-party logistics companies, and customers, etc. different from previous decentralized model of e-commerce platform, through the integrated e-commerce platform, customers can complete all business with one-stop, and improved their service perception and satisfaction. And new model is more promoted and implicated in other industry. The system has been applied in the enterprises, and the result is very good. The bus-based integrated e-commerce platform will become one of the paths for enterprise to further development.

Abstract: An intelligent reconfigurability model based on multi-agent theory was proposed in this paper to improve feasibility of automotive manufacturing system. Each production management department in automobile manufacturing enterprises was designed as an independent agent. The practicability and rationality of the manufacturing system model was simulated as communication and interactive between different agents in this multi-agent system through JAFMAS. The application of multi-agent model in the design of automobile manufacturing system can promote the reconfigurability and intelligent level of the system.

Abstract: DNC is a typical way of integrating manufacturing information. In order to provide information for managers and technicians, this paper firstly researches on manufacturing information integration model based on DNC, and then designs the architecture of the workshop network and the mode of information exchange through Ethernet on analysis of manufacturing information stream. It also presents a method of information acquisition from NC machine. Finally, the validity of the model and network is verified by implementation of the manufacturing information integration system.

Abstract: In high pressure water jet field, most components worked under very high fluctuated pressure. The high and fluctuated pressure would fail those components quickly, which leads to very short period of fatigue life for high pressure components. Cold expansion process could improve components fatigue properties greatly. This has been known for a while. By applying this process in high pressure field, much longer service time is expected. This paper investigated the cold expansion process experimentally. Based on micro-structure investigation, the strengthening mechanism has been explored.

Abstract: This paper analyzes traditional die casting process to find out the reasons that cause shrinkage cavity and porosity defects in casting. An optimized process of die casting by using local extrusion is proposed. A device used in local extrusion which realizes forcing compensating contraction on key parts of crankcase is designed and the parameters of local extrusion process are discussed. Compared the mechanical properties and microstructure of local extrusion used in die casting production with traditional. It shows that local extrusion used in die casting production can not only achieve the aim eliminating shrinkage porosity and cavity of a casting but also can refine grain to improve the mechanical properties.