Advanced Materials Research Vols. 211-212

Abstract: The effect of PDMS on foamability of R-PP was investigated using a single screw extrusion foaming system, with supercritical carbon dioxide as the blowing agent. Experimental results indicate that the addition of a small amount of PDMS will improve expansion ratio of R-PP foamed samples. Furthermore, compared with pure R-PP, cell-population density of foamed samples obtained from R-PP/PP-g-MAH/PDMS blends was obviously higher than that of pure R-PP foams.The experimental results show that blending with PDMS is beneficial for improving foaming performance of R-PP.

Abstract: In this paper, based on the finite element analysis platform ANSYS, the stress field of particle reinforced metal matrix composites (PRMMC) caused by current impulse has been simulated. The cube cell model and multi-particle random distribution cell model are used in this simulation. The current field, temperature field and stress field of PRMMC caused by current impulse are given. The influence of material character of PRMMC, number or volume fraction of the particles in cell model, particles shape and distance on those fields is analyzed.

Abstract: A micromachining technique has been developed for the fabrication of microscale polymer-bonded magnet. Two types of lithographically defined molds, photoresist mold and electroplated metal mold, were introduced. Photoresist mold is convenient, while electroplated metal mold can be fabricated on the glass or steel substrate which can bear much more compression. NdFeB films of thickness between 50 and 500 µm were prepared by micro-patterning of composites containing 83-95wt% of commercial NdFeB powder after curing at the room temperature. Magnetic properties mainly depend on the types and percentage of volume loading of magnetic powder. Coercivity of 772.4kA/m (9.70kOe), remanence of 275.1mT (2.751kG), and energy product of 22.6kJ/m³ (2.8MGOe) have been achieved. This easily developed magnet could be a promising candidate for applications in magnetic microelectromechanical systems (MEMS).

Abstract: This paper main introduces design thought and method of a New structure of variable speed fluid couplings and innovation of design and difficult of manufacturing. It have reference value for personnelof fluid couplings design and manufacturing.Using software and FEM theory analyzed pump wheel strength. The pump wheel strength reliability was proved. It provides the design method of calculating the effective for this new hydro-couplings design.

Abstract: A silicon-containing arylacetylene resin, poly[(dimethylsilyl)eneethynylene phenyleneethynylene] with methoxy silyl terminal group (abbreviated MSAR) was synthesized. The resin and tetraethoxysilane (abbreviated TEOS) were used to prepare silicon-containing arylacetylene resin (abbreviated SAR) /SiO₂ hybrid materials by a sol-gel method. Both the curing process of the xerogel and thermal properties of the hybrid materials were studied by FT-IR, DSC and TGA. The thermogravimetric analysis of the hybrid materials showed that Td₅ (temperature of 5% weight loss) was 696°C and char yield was 92.1% at 800°C in nitrogen. A Si-C-O ceramic residue was obtained in high yield(86.8%) by sintering up to 1450°C in nitrogen.

Abstract: In order to research the problem of rescue chamber colliding with the tunnel wall. The theoretical model of rescue chamber has been formed, based on the principle of energy conservation, by using theories of plates and shells, large deformed plate and shell, and by analysis of dynamic response of mine rescue chamber under axial impact load. This model includes initial velocity, contact force deformation energy and shell deformation. Dytran software was applied to build the finite element model of the rescue chamber contacting the rigid plate. Through comparison emulation result and theoretical analysis result, this model is proved to be highly reliable. The theoretical calculation and the simulation indicated that there were obvious relationships among the ability of the mine rescue chamber under axial impact load with the thickness, depth of flat spherical shells. If the thickness or depth increases, then the chamber could stand more. It is also confirmed that increasing the depth of flat spherical shells can minish the impact force for making impact process abate, which provides a basis for the research of rescue chamber.

Abstract: We designed a twin flying winding machine control system based on PLC to improve its performance. The system uses PLC to receive control signals and drives executing machines, employs touch screen to provide a user-friendly interface, uses AC servo system to perform winding and rotor indexing localization, and uses automatic tension control system to enhance the capacity of winding tension control. The system is able to speed up the winding of enameled wire, improve the accuracy of winding localization and indexing, and enhance the winding quality and the interaction between human and machine. It has been proven that the winding machine is easy-to-use and reliable. The system is suitable for automatic assembly line production control and can be applied widely.

Abstract: Cure-induced strain is produced inevitably during the fabrication of the composite. To measure the strain, undamaged methods such as using fiber Bragg grating(FBG) sensor are employed. In this paper, nine unidirectional carbon fiber-reinforced polymer(CFRP) laminates are autoclaved produced, with FBGs embedded in different layers through the thickness (0-layer, 5-layer, 10-layer and 13-layer). The experiment measures the difference of the FBGs’ Bragg wavelengths before and after the cure which is linearly relevant to the cure-induced strain, to explore the distribution of strains through the thickness. The experimental results indicate a certain strain in neural plane of approximately 370με under the designed size of the laminates. The results also show that the cure-induced strains in different layers through the thickness are less than 1000με even including all errors, however they do not display distinct regular in thickness direction. Moreover, through the FBG sensors and the thermocouples, the cure process with the strain and temperature variations is understood well. The result verifies that the cure-induced strain is mainly generated at the end of the cure when the temperature cools down.

Abstract: An intelligent control system of pressure forming equipment for stator and rotor is presented. The architecture of the high-speed stamping product line is introduced first. Then the function of the control system is analyzed and the control system is designed. Finally, the stamping process is studied and the intelligent stamping process optimizing system is developed.

Abstract: This paper, which studied the structure of CAD/ CAE system, has proposed a universal CAD / CAE integration framework. This system, with good compatibility and being convenient to be used, can be the basic platform for all CAD / CAE systems. This framework, with a unified structure of command processor, the message processing system, selection mechanism, can transform the development of CAD / CAE integrated system to that of functional command module. With the help of this framework, functional development no longer relies on framework. Therefore, the framework greatly enhances the efficiency of software system development.