Applied Mechanics and Materials Vols. 303-306

Abstract: The recovery and utilization to building solid waste is the current hot issues in the construction of towns. In this paper, 30 groups of fly ash recycled concrete test cube were designed and produced, through the mechanical performance test research, we analysised the main influence factors to the strength and performances of fly ash regeneration concrete test cube,such as recycled aggregate category, water cement ratio, the admix proportion of recycled aggregate. The test results would lay a solid foundation for the test research and engineering application of recycled concrete.

Abstract: This template explains the principle of microwave heating and iron ore magnetization roasting principle. Moreover，it summary analysis microwave heating in the use of iron ore magnetization roasting and points out that we should strengthen the study on microwave heating mechanism.

Abstract: This mechanical processing waste emulsion for the study, handled by pulse electrolysis. Arrangements by orthogonal testing, experimental study on plate distance (d), current density (i), the pH value and the pulse width (tP) impact on COD removal efficiency, very poor analysis of test data to determine various factors affecting the COD removal efficiency of primary and secondary sort: pH value > current density > pulse width > plate distance, optimal operating conditions. Orthogonal experimental data derived from regression analysis, determination of cross of quadratic polynomial regression equations, mathematical model. Tests confirmed that pulse electrochemical method for treatment of waste emulsion with low energy consumption, short response time, and other advantages, strong applicability of wastewater, building mathematical models, providing theoretical basis for subsequent design.

Abstract: Porosity plays an important role in the characterization of transport properties. However, it is quite difficult to predict the unknown porosity values only by some sparse conditional data in the process of simulation based on current popular interpolation methods. Therefore, some interpolation or extrapolation methods are used to estimate or predict the unknown porosity for better simulated results. Any numerical modeling should incorporate all relevant information from different scale data including coarse scale support data (block data) and fine scale support data (point data) to improve interpolation accuracy. Block error simulation (BESIM) is an alternative algorithm to generate stochastic realizations conditioned to both point and block data. Under the rather severe restriction, block data are linear averages of their constituent point values. This method allows reproducing both block and point data at their locations. The experimental results demonstrate that BESIM is practical in porosity simulation.

Abstract: Through full-scale fatigue test, a comparative study of the ability to resist temperature fatigue and load fatigue was performed among high elasticity rubber mastic stress-absorbing band, fiberglass-polyester paving mat and SAMPAVE stress-absorbing layer, which were technologies to prevent reflection cracking. And they were verified by engineering. The results suggest that the overlay structures with the old cement concrete pavement partially treated with high elasticity rubber mastic stress-absorbing band are of the best fatigue performance to prevent reflection crack caused by load, and its temperature fatigue performance is equivalent to the overlay including SAMPAVE stress-absorbing layer. At the same time, Rubber Mastic Stress-absorbing Band is the most economical way.

Abstract: Aluminum ester grafted polypropylene copolymer (PP-g-DL411) compatibilizer and PP-g-DL411/GF/PP composites are prepared by melting cross blend. FTIR results show that DL411 grafts on PP molecular chains and leads to a new PP-g-DL411 copolymer. SEM reveals that PP-g-DL411 can effectively improve the interface compatibility and enhance the interfacial adhesion between GF and PP. Experimental results indicate that the best comprehensive properties of PP-g-DL411/GF/ PP composites are achieved when the percentage of PP-g-DL411 is 8% and that of GF is between 40% and 45%. In particular the impact strength is increased by 222% compared with uncompatibilized GF/PP.

Abstract: 1-methyl-3-butyl Imidazole chloride is prepared by 1–methyl imidazole and chlorinated n-butane. The synthesis reaction of 1-methyl-3-butyl imidazole tetrafluoroborate is in the acetone. The solubility of NaBF₄ and BMIC in acetone is not large, but due to the insolubility in acetone of reaction product NaCl and continuous precipitation from the liquid phase in the reaction process, so as to promote the reaction continuously towards forward direction. The colorless transparent and odorless BMIBF₄ are gotten. We use infrared spectrometer for the structure characterization, it is proved that we have gotten BMI-BF₄ room temperature ionic liquids. BMIC ionic liquid has better solubility in H₂O, ethanol, ethyl acetate, acetone, acetonitrile, and methanol, and is insoluble in the ether and cyclohexane.

Abstract: Nanocrystalline magnets (SmCo5)94(Cr3C2)6 were prepared using melt-spinning and their magnetic behaviors were investigated by studying their structures and magnetic properties. The alloys prepared using rapid solidification consisted of SmCo5 matrix phase, MgCu2-type SmCo2 secondary phase, and small traces of Sm2Co7 phase. The solidification with higher wheel speed were found to be preferable for the formation of single SmCo2 secondary phase. Relatively high coercive values of 28–36 kOe and high reduced remanence of 0.78–0.79 were observed for the SmCo5/SmCo2 nanocrystalline magnets. The shape of the corresponding magnetization curves revealed that two magnetization processes, nucleation and pinning of domain walls, took place in these magnets. The Henkel plots indicated strong inter-grain exchange coupling effect in these ribbons, consequently resulted in the phenomena of domains interacting with each other and enhancement of the remanence in the ribbons.

Abstract: The mechanical behaviour of as-cast AZ31 Mg alloy has been investigated at strain rates up to 2.0×103s-1. Dynamic tests were carried out at room temperature using a Split Hopkinson Pressure Bar (SHPB) apparatus. Microstructural characteristic were analysed by Image MAT A1 optical microscopy. The results demonstrated that AZ31 Mg alloy exhibited obvious yield phenomena and strain hardening behaviour at high strain rates. The basically same curvature of stress-strain curves exhibited an similar strain hardening rate. The dynamic yield strength changes little and the peak stress increases with the strain rates. An examination by optical microscopy after high strain rate deformation reveals the occurrence of twinning and twin area percentage increases with the strain rate increasing.

Abstract: The circular permeability,  =  + j, of a Fe73.5Cu1Nb3Si13.5B9 annealed (500oC, 1 h) amorphous wire was obtained from the measurements of impedance, Z = R + jX = R + jL, as a function of circular magnetic AC field (H = 0.15 – 200A/m) and applied torsion ( = -7.5 – 11.5 rad/m). So the influence of  upon the circular magnetization has been studied. We found that the effects of applied torsion on the circular magnetization can be explained by considering the magneto-elastic interaction and a helical domain structure in the sample. The large change of  with  may be used as a torsion sensor.