Advanced Materials Research Vols. 971-973

Abstract: Thermal deep-drawing is a main processing technology which is used to plastic forming for magnesium alloy sheet. Combined with the research status, several deep drawing methods were introduced in detail in this paper, including indirect heating deep drawing, direct heating deep drawing, differential temperature deep drawing, warm hydraulic deep drawing, warm deep drawing with solid particles, warm deep drawing with segmental blank-holder, pre-forming warm deep drawing. Finally, the development trend and burning questions of magnesium alloy thermal forming technology were predicted.

Abstract: Zirconium hydrogen phosphate / sulfonated poly (arylyene ether) s composite membranes has been prepared and evaluated by the unit cell test for direct methanol fuel cell (DMFC) applications. The comparison between the performances of zirconium hydrogen phosphate/ sulfonated poly (arylyene ether) s composite membranes and Nafion 115 shows that the unit cell performance with composite membrane was superior to that of Nafion, which makes zirconium hydrogen phosphate/ sulfonated poly (arylyene ether) s composite membrane a potential candidate for direct methanol fuel cells.

Abstract: nanomagnesium hydroxide (Mg (OH)₂) is promising potential material for biomedical applications, such as nanomedicine. However, little is known about the hemolysis of nanostructured Mg (OH)_2. In the present investigation, Mg (OH)₂ nanoparticles synthesized by precipitation technique using magnesium nitrate and sodium hydroxide. The phase structure and morphology of the Mg (OH)₂ nanoparticles are characterized by X-ray powder diffraction (XRD), selected area electronic diffraction (SAED) and transmission electron microscopy (TEM) respectively. Hemolytic activities in vitro are carried out on the synthesized nanoMg (OH)₂ samples and the studies reveal that Mg (OH)₂ nanoparticles have mild activity against erythrocytes.

Abstract: Tensile mechanical behaviors of two kinds composite laminates G803/5224 and G827/5224 specimen after high-speed impact were investigated separately. The influences of open-hole on the specimen’s net tensile strength were analyzed by comparing with standard specimen’s experimental results. An FEM model was established to simulate the damage growth in the laminates. Different equivalent zones were applied to model different velocity impact damages, and different damage criteria and modulus attenuation rules were used for two different ply forms.

Abstract: A new foam fracturing fluid composed of sodium dodecyl sulfate (SDS), fluorocarbon surfactant (FCS-11), viscoelastic surfactant VES is proposed and developed in this paper. The performances of this fracturing fluid were systematically investigated. The experimental results show that this foam fracturing fluid has good shearing resistance, viscoelasticity and stability. And above all, once broken it has no residue and the damage rate is only 10.12%. These advantages give it a wide application prospect in coal bed methane development.

Abstract: The effect of heat treatment on the microstructure and mechanical properties of High Strength steel plate Q960E for construction machinery was investigated. The result shows the quenching temperature have obvious effects on the mechanical properties, DQ can improve the toughness and the enchance tempering resistance, precipitations become more and bigger with the rise of the tempering temperature.

Abstract: ZnO hollow nanofibers were fabricated by sputtering using electrospun PVP nanofibers as templates. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and UV Raman were used to characterize the morphologies, crystal configuration and bonding structure of ZnO hollow nanofibers. A reactive mechanism of the transformation from poor polycrystalline ZnO (Zn-rich) prepared by sputtering from a metallic Zn target to good polycrystalline ZnO after annealing is proposed. The mechanism results in great decrease of oxygen vacancies and interstitial zinc of the ZnO hollow nanofibers after annealing. Optical properties were investigated by the photoluminescence spectra. Enhancement of ultraviolet emission of the ZnO hollow nanofibers is discussed.

Abstract: The concrete filled steel tubular (CFST) structure takes full advantages of the interaction of two materials in the process of loading, while the thermal performance parameters between steel tube and concrete are different, and the outside temperature changes makes the structural section produce a greater temperature gradient, which leads to the uncoordinated deformation between them. In this paper, the thermal conductivity of experimental system is carried on the theoretical analysis, then the distribution regularities of sectional temperature are obtained through the testing its of CFST under variable temperature effect, and the larger temperature difference will produce the temperature stress, which affects the bonding performance of structural interface. So in order to better analyze the influence which is impacted on the mechanical performances of structure by the combination effect of multiple factors such as temperature and load, such paper can provide the theoretical and experimental foundation.

Abstract: Themagnetic particles in magneto-rheological fluid should have high coercivity,low proportion, and higher stability in a large temperature range. Based onthese, the article summarizes the characteristics, the development process andvarious physical and chemical preparation methods of magnetic particles, andpoints out the existing problems, and looks forward to the development trend ofpreparation methods, structure and property mechanism of magnetic particles.

Abstract: Magnetic fluid (MF) is a new functional material researched in recent years. It has lots of properties such as superparamagnetism, high permeability, first-order and second-order buoyancy principle suitable for sensor application. The sensing properties decide the sensor applications of magnetic fluid. Different application sensors such as pressure differential sensor, acceleration sensor, and angle sensor were demonstrated and the working principles were presented.