Advanced Materials Research Vol. 511

Abstract: The mechanical and physical properties of Austenitic stainless steel are analyzed in detail in this paper, and the main problems of the influencing the material on machining are pointed out. Based on much experience and study, this paper puts forward the effective methods for the selection of cutter material, cutter angle, stock removal and cutting lubricant.

Abstract: Turbulence mixing in T-junctions filled with porous metal materials is numerical investigated using Large-eddy simulation turbulence model. Three cases of porous metal materials, made of three sintered metal spheres with different thermal conductivities (387.6 W/m۟۬•K for copper, 202.4 W/m۟۬•K for aluminum and 16.3 W/m۟۬•K for steel), are predicted. Compared the results of three cases, a higher thermal conductivity can also contribute more greatly to heat transfer enhancement. In T-junctions filled with porous metal materials, thermal conductivity is weakened considerably by the turbulence mixing of hot and cold fluid. The temperature fluctuation are no obvious different.

Abstract: This paper studied the preparation of chemical raw materials–methanol using blast furnace gas obtained from steel production process. The energy saving and emission reduction effect and the economic benefit brought by the co-hydrogenation process of a mixture of CO and CO2 (CHP) has been compared with those brought by the respective hydrogenation process of CO and CO2 (RHP). The result shows that the CHP brings more economic benefit than the RHP, and the CHP brings more energy saving and emission reduction effect than the RHP.

Abstract: Lithium titanate was synthesized by liquid method and lithium hydroxide was used as raw materials. During the synthesis process, the value of n(Li)/n(Ti), the calcination temperature and calcination time were investigated. The experiment results show that when the molar ratio of Li/Ti is 0.85 and the lithium titanate was heat-treated at 750 °C for 8 h, we could get the target product which showed the best electrochemical performances. it was considered to be an excellent electrode materials for lithium-ion battery, and an ideal alternative to carbon anode materials.

Abstract: Mg1.5Mn0.5Ti0.75O4 was prepared by a coprecipitation/thermal crystallization method. The extraction/insertion reaction with this material was investigation by X-ray, saturation capacity of exchange, and Kd measurement. The acid treatments of Mg1.5Mn0.5Ti0.75O4 caused Mg2+ extractions of more than 72%, while the dissolutions of Mn4+ and Ti4+ were less than 8.2%. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 10.6mmol/g for Li+.

Abstract: Magnesium-manganese-titanium oxide (Mg2Mn0.5Ti0.5O4) was prepared by a coprecipitation/thermal crystallization method. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treatments of Mg2Mn0.5Ti0.5O4 caused Mg2+ extractions of more than 73%, while the dissolutions of Mn4+ and Ti4+ were less than 13%. The experimental results have proved that the acid-treated sample has a capacity of exchange 12.6mmol•g-1 for Li+ in the solution.

Abstract: The MgMn0.25Ti0.75O3 was synthesized by a coprecipitation/thermal crystallization method. The extraction/insertion reaction with this material was investigation by X-ray, saturation capacity of exchange, and Kd measurement. The acid treatments of MgMn0.25Ti0.75O3 caused Mg2+ extractions of more than 74%, while the dissolutions of Mn4+ and Ti4+ were less than 8.2%. The experimental results have proved that the acid-treated sample has a capacity of exchange 9.5mmol•g-1 for Li+ in the solution.

Abstract: The hydrocompaction is a complicated characteristic of loess material. Most of the collapsible issues are related to water content variation. The widely used computational constitutive models cannot catch the collapsible deformation behavior of loess material. A constitutive model for collapsible loess is presented. The moisture content of increasing dampness is treated as an internal stress, and the yielding surface of collapsible volume and the shear-yielding surface are obtained from the regressive analysis of test data. The stress-strain relation for collapsible deformation is established based on the generalized plasticity theory

Abstract: A constitutive model for collapsible loess material is presented. The numerical experiments indicate that this model can capture hydrocompaction behaviors of loess material under different water contents and pressures. The numerical results show good agreement with the laboratory tested collapsibility parameters of the loess material. The model is also applied to study a loess material-filled slope with height of 38m using FLAC5.0. The stability and the collapsibility deformation status of the loess slope are analyzed

Abstract: In order to promote the efficient recovery of the vibration energy, to achieve the purpose that energy of vibration can be converted to electrical energy and implement the vibration energy recovery, the electroactive polymers (EAPs) were discussed and studied in this paper. The vibration power generation mechanism of EAPs and vibration system were theoretical analysed, a nonlinear technology (synchronized switch harvesting with inductor) was used in process of energy recovery. The experimental results showed that EAPs had good effect of the vibration energy conversion and nonlinear technology was more efficient than conventional technology in energy recovery.