Applied Mechanics and Materials Vols. 543-547

Abstract: Starch nanocrystals obtained from acid hydrolysis, and the starch/natural rubber latex film was prepared by blending the starch nanocrystals with natural rubber latex. The latex properties such as viscosity and mechanical stability, water and toluene uptake, crosslinking density and mechanical properties of the latex films were investigated. The results showed that the mechanical stability of natural rubber latex reinforced by starch nanocrystals increased, but the change of viscosity was not obvious. By adding starch nanocrystals in natural rubber latex, the swelling by toluene decreases and the swelling by water increased. The mechanical properties and crosslinking density of films were enhanced with the increase of starch loading.

Abstract: Functionalized magnetic silica nanospheres were prepared by hydrolyzation of tetraethyl orthosilicate (TEOS) on Fe₃O₄ and modification of Fe₃O₄/SiO_x. Structure of functionalized magnetic silica nanospheres were characterized by transform infrared spectroscopy (FTIR) and differential thermal analysis (DTA). Cellulase was immobilized on functionalized magnetic silica nanospheres through cross-linking method. Saccharification rate of the immobilized cellulase is 70 % of that of free cellulase. The saccharification of the immobilized enzymes after 8 continuous uses still have 10 % of the initial saccharification rate, which demonstrate the potential of this immobilized cellulase for biofuel production.

Abstract: YG8 was used as working electrode in the mist medium to reinforce the surface of the H13 steel. Microstructure, thickness, phase composition and hardness of the reinforced surface were studied with the XRD, SEM, micro vickers hardness tester. Experimental results show that the phase are mainly Fe₃C、FeCr、α-Fe and Co₃Fe₇, surface are orange-peel like, the microhardness of surface is 1286HV, 3times better than the body layer.

Abstract: Plane wave expansion (PWE) method and finite element method (FEM) are applied to analyze the vibration reduction characteristic of the phononic crystal structural plate, and the results of two methods are consistent. The range of band gap is acquired, which certain frequent elastic wave propagation is forbidden.

Abstract: Against the problem of large machining error and low productivity of aluminum alloy spherical plain bearing, the paper is concentrated on building finite element model in MATLAB to research the radial and axial deformation law under various cutting conditions with theories of heat transfer, isoparametric element and functional variational method, providing theoretical and data support to enhance machining accuracy of spherical plain bearing outer ring.

Abstract: We carried out an atomic-scale study of the behavior of nanoscale void defect in shock loading condition by the means of non-equilibrium molecular dynamic simulation. Atom trajectory and local temperature were investigated in different stages in the non-equilibrium process in the conditions with specific shock speed. The results show that the local temperature is significantly affected by the nanoscale void defect of bcc iron and a hot spot is formed in the initiation stage of the shock loading compression and consequently the hot spot induces the melting of the sample.

Abstract: 3D stacking technology with TSV interconnect is becoming a major trend of microsystem packaging. Redistribution layer (RDL) plays an important role in TSV packaging applications. Inorganic RDL based on AlN/sodium silicate composite through wet process has been put forward in this paper. After mixing AlN powder with sodium silicate uniformly and curing of the mixture, AlN/sodium silicate composite dielectric was formed. Finally a novel wet RDL process was developed for TSV interposer applications.

Abstract: This work reports photoelectric properties of ultrathin BiOBr nanosheets synthesized by a PVP-assisted hydrothermal method. BiOBr nanosheets exhibited excellent photoelectric properties to ultraviolet and visible light, such as excellent repeatability and good stability.

Abstract: To solve the difficulties of processing micro holes on the CMC-SiC, femtosecond laser was used as the drilling tool in this paper. And a new type of laser beam scanning module was studied. The study confirms the feasibility of finishing the processing of micro holes whose diameter is less than 2mm on the new CMC-SiC. And the preliminary optimization of processing parameters is completed. According to the experimental results, the important factors affecting the quality of the micro holes were analyzed, and the factors are the processing power and the scanning speed. The results also show that the femtosecond laser processing technology can solve the difficulties of drilling mirco holes on the new CMC-SiC in our countrys aerospace field.

Abstract: Springback in the sheet metal stamping technology is a hot research subject in the sheet metal forming field. This article takes the semi-circular arc stamping parts as the objects of research. It aims at improving precision of the flanging forming parts and decreasing the bending springback. It analyzes the forming technology and deformation characteristics of flanging forming theoretically. Besides, it adopts the numerical simulation method to carry out research on the key factors influencing the forming process of semi-circular arc stamping parts (flanging and then bending) and the springback deformation, in order to find out the optimum production process scheme for semi-circular arc stamping parts.