Applied Mechanics and Materials Vols. 401-403

Abstract: to achieve standardized design of industrialized notoginseng seedling slot, this paper is based on analyzing existing seedling slot to propose a total of six kinds of design schemes which are combining structure and size. Then four evaluation criteria are constructed that consist of land-use ratio, mechanical operation stability, economic rationality and manual operation convenience. At last, Scheme optimization is using analytic hierarchy process (AHP), the best scheme is found

Abstract: Containing pyrimidine and pyridine monomers were incorporated respectively into the main chain of a sulfonated polyimide in order to investigate the effect of nitrogen-containing heterocycles on membrane properties such as water uptake and proton conductivity. With increasing content of the nitrogen-containing heterocycles, water uptake of membranes and dimensional changes remarkable decrease. The copolymer showed higher thermal stability (desulfonation temperature up to 330 °C) and reasonable good mechanical properties. These membranes also showed higher proton conductivity, which was comparable or even higher than Nafion 117.

Abstract: Single Bi-doped and M/Bi co-doped silicate glass (M=Al, Y, La) were prepared and broadband NIR emission were observed when the glass samples were pumped by 514 nm and 808 nm LD, respectively. The absorption intensity and emission intensity of the Y/Bi co-doped glass and La/Bi co-doped glass decrease obviously compared to single Bi-doped glass. The absorption intensity in the region of 600-1100 nm and the NIR emission intensity pumped by an 808 nm LD were remarkably enhanced by the introduction of Al₂O₃ into the Bi-doped silicate glass. It is suggested that the Al/Bi co-doped silicate glass might be very useful for broadband fiber amplifiers and widely tunable lasers.

Abstract: An optimization method for blended composite panels with aeroelastic constraint is presented in this paper. On the basis of composite panel sub-region division, the lamination parameters of a guide laminate and length indicator of each ply of the guide laminate are introduced as design variables using parallel genetic algorithm (GA) for optimization. For each individual, the inverse problem of obtaining laminate configuration to target the lamination parameters is solved by another GA. The method of defining design variables can reduce the number of design variables obviously compared with previous work. And the numerical results indicate that the present method is capable of producing fully blended designs of composite wing with aeroelastic performance improvement and weight reduction.

Abstract: The purpose of this study is to propose the analytical model for clinched joint, which can be used to predict the joint strength based on the neck-thickness and undercut of clinched joint. The analytical model has been defined as a function of neck-thickness and undercut based on the neck fracture mode which is the most reasonable and common failure mode for clinched joints. Clinching joining experiment with different joint geometric variables with RIVCLINCH 1106 P50 and tensile-shear test with MTS landmark were conducted. The comparison of the clinched joint strength between experiment and analytical model shows good similarity within 7.2% error. The analytical model proposed for clinched joint strength is valid to calculate the clinched joint strength.

Abstract: Q235 stamping material thickness is 1 mm, with flip composite mould for production. Mold design using Pro/E, primarily for intensive convex, concave die, punching die design is analyzed, and based on Pro/E mold assembly.

Abstract: This paper reports the resistive switching characteristics and mechanism of CeO₂ based ReRAM. The CeO₂ films were deposited on Nb:SrTiO₃ substrates under different oxygen pressures (0.01Pa and 10Pa) to obtain different concentrations of oxygen vacancies in the films. The results show that the resistive switching properties become more pronounced with more oxygen vacancies in the CeO₂ films. The device with 0.01Pa oxygen pressures exhibits high resistive switching ratio of 2×10³ and multilevel memories. Furthermore, a model based on the modification of the interface property induced by the oxygen vacancies in these structures is proposed to elucidate the underlying physical origins. Key words: resistive switching, oxygen vacancies, carrier injection, multilevel memories.

Abstract: A GC/MS method was established for the determination of phthalates plasticizers in bottled beverages. The calibration curves are all linear in the range of 0.01 to 5μg/L with correlation coefficients greater than 0.997. The recoveries are in the range between 97.27% and 105.05% under two levels. The testing data of the samples showed that the five bottled beverages all contained DBP, DIBP and DEHP plasticizers, and DIBP content was obviously higher than the other two.

Abstract: The rapid development of the large steel structure brings a great opportunity for steelmaking industry. The steel plates not only have the strength and toughness but also can withstand the high energy input welding. Using the calcium oxide of high melting-point and high stability to pin the grain boundaries is an effective method to improve the welding performance of the structure steel. This experiment takes the HSLA steel as the research object, the second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium into the steel in the form of Ca-Si alloy. The effect of calcium addition on the cast microstructure of HSLA steel was analysed. The results show that the cast microstructure is mainly consist of lamellar and acicular ferrite, a small amount of pearlite and bainite. Compared with the original steel, there are acicular ferrites presenting in the experimental steel after adding 5 wt% Ca, which are the microstructure that we hope to get. The acicular ferrite will have a positive impact on the mechanical properties of the subsequent rolled steel.

Abstract: Cu-30wt%Ag alloy nanopowders were prepared by induction plasma system, and the effect of hydrogen content in plasma atmosphere on morphology and size distribution of nanopowders was studied. The results show that with the increase of hydrogen content, the size of the prepared Cu-30wt%Ag alloy nanopowders is refined from 213 nm to 151 nm and then to 117 nm, however, there is no obvious effect on the morphology of nanopowders. The variation of nanopowders size should be attributed to the introduction of hydrogen, which leads to the change of energy coupling degree between starting powder and induction plasma.