Applied Mechanics and Materials Vols. 541-542

Abstract: On the basis of processing the PCrNi3MoVA steel with cryogenic treatment and then experimenting with the static tensile and impulse at room temperature, the effects of cryogenic treatment on macro-mechanical properties of the material is studied. The test results show that tensile mechanical property of PCrNi3MoVA steel can be improved with appropriate number of cryogenic treatment, otherwise can be weakened if the number is inappropriate; at the same time, there is no influence of cryogenic treatment on impact toughness of the material

Abstract: In order to study the mechanical properties of recycled concrete small-sized hollow block, some recycled concrete small hollow blocks were tested separately for mechanical behaviors. Through experimental study, the density, moisture content, anti-permeability, dry shrinkage, compressive strength and bending strength of mechanical property parameters are derived. The results show that material performance indicators of the recycled concrete small-sized hollow block meet the stipulations of the code requirement.

Abstract: Based on elastic good for beryllium bronze material making sensitive vibrating components of accelerometer, and developed the capacitance the capacitance sensitive type of accelerometer. Then designed a kind of detection circuit, which can be used to detect differential capacitance signal. Gives the electronic components used in the circuit, through analyzed for solving, then giving the direct proportion relation between the output voltage of the circuit and the sensor signal pickup the capacitance variation. The experiment shows that the sensitivity of accelerometer is about 391.12mV/(m/s²).

Abstract: True stress-strain data is obtained for 6061Al/ 10% SiC composites by hot compression test. Mathematical models for % volume of recrystallization and diameter of the recrystallized grains are developed with process parameters such as strain, strain rate and temperature. These models are applied for optimization of the grain size and % volume of recrystallization. An attempt has been made to control microstructure evolution during hot deformation using fuzzy logic controller through simulation in MATLAB software. The fuzzy logic controller parameters are tuned using genetic algorithm.

Abstract: Mineral compositions and granule morphology of reconstructed steel slag with electric furnace slag as an adjusting component were discussed. The vitreous content with hydrofluoric acid erosion and petrographic analysis were carried out. The results showed that the vitreous content of steel slag was lower than that of raw and first decreases and then increases as the calcination temperature increases; C₃S becomes hexagonal sheets or square columnar with the size of 40 to 60 microns and C₂S becomes spherical with size of 20 to 50 microns. Particle shape is more regular and the size is smaller than that of raw.

Abstract: Heavy metal stabilization is a promising technology of soil remediation with short period and easy operation that has seen a recent explosion of interest. The effectiveness of Pb²⁺, Cu²⁺, Zn²⁺ and Ni²⁺ stabilization upon the waste biologic materials addition was investigated in this study. A contrast experiment was performed with materials including shell powder, bone meal and biochar. The results showed that biologic stabilizers have good stabilization ability of heavy metals in soil. The 2.5 wt.% shell powder and 2.5 wt.% bone meal treatment was the most effective, with solid stabilization performance on Pb²⁺, Cu²⁺, Zn²⁺ and Ni²⁺ by reduce the heavy metal cations over 87.69%, 92.40%, 63.37% and 80.32% respectively. The combination of shell powder and bone meal improved the rate of multiple heavy metal contaminated soil stabilization, while decreased alkalization of soil. In addition, the average production cost of mixed stabilizers in this study was around 1800 RMB/ton, with average of 200 RMB/ton remediation cost for heavy metal contaminated soil stabilization using these additives. The success of the mixed stabilizers with biological materials showed a promising and cost-effective approach for multiple heavy metal contaminated soil remediation.

Abstract: A beneficiation experimental research is conducted on sulfur-containing 10.57% lead-zinc tailings from Fujian. On the basis of the traditional mineral processing technology, the first is pre-classification by high-frequency vibrating, and then flotation-magnetic united technology. Eventually, the average grade of sulfur concentrate is 43.51% with comprehensive recovery 89.33%. The lead-zinc tailings get a comprehensive utilization, which has a better effect.

Abstract: Green and biodegradable may degrade to the direction of the main purposes for cushion packaging material. This paper the bubble growth mechanism of the material in the molding process, the microstructure of four kinds different foaming agent content of biodegradable materials have been studied by using a scanning electron microscope micro-chemical analysis for plant fibers, starch-based materials, through the foam forming process biomass biodegradable materials research object. The results showed that the biomass material in the biodegradable plant fibers are mutually connected to form a three-dimensional network structure of the cross; foaming agent content of 1.0%, the raw material biodegradable material having a structure with a closed air pockets distributed more evenly, which kind of uniform material structure ensures good impact resistance, rebound and thermal insulation.

Abstract: Biomass cushioning packaging material has been gaining attention in the properties of the materials because of biodegradable and green environmental protection, and the starch plastics play an important role. Urea, formamide, glycerol, ethylene glycol four material compounded with starch respectively, for the purpose to forming hydrogen bonds by the test in this paper, the ability to hydrogen bond with the starch has been observed by infrared spectrum analysis. The results showed that urea, formamide as strong electronegative group stronger binding, glycerol and ethylene glycol are more preferably to form hydrogen bonds with the starch because of more hydroxyl group content.

Abstract: The automotive and aerospace industries have been the main driving force behind the search of new production processes which are capable of producing components with high integrity. Squeeze casting is one such novel metal processing technique which combines the advantages of both casting and forging in one operation. Squeeze casting process is suited for all melting ranges of metals varying from lead to iron. But nowadays, light weight materials like aluminium and magnesium are mostly used in the above mentioned industries. Aluminium alloy 6061 is one such futuristic material that is widely employed to produce automotive and aerospace components. In this research two sets of cylindrical components of AA6061 were produced through squeeze casting where the first set of components was produced without employing ultrasonic cavitations and the second set of components was produced by employing ultrasonic cavitations and the components were tested for tensile strength and hardness respectively. It was observed that the values of tensile strength and hardness exhibited by the components produced using ultrasonic cavitations were higher when compared to the values exhibited by the components produced without employing ultrasonic cavitations.