Advanced Materials Research Vols. 211-212

Abstract: Water-jet guided laser machining is a kind of material processing technology using water optical waveguide which is formed by coupling a high energy laser beam into variable-length water jet. In order to design the coupling unit and form the effective energy-jet, the research on the distribution of output intensity is beneficial to understand the structure of the coupling unit and improve the coupling efficiency of laser energy. This paper lists the different coupling misalignments in the coupling unit when laser couplings into water-jet. In this paper, the distribution of energy output intensity in water-jet guided laser is simulated with the ray trace theory under several different types of coupling misalignments with ZEMAX software, the results show that misaligned coupling provide various morphology of energy output intensity distribution: center peak morphology, ring peak morphology, and uniform peak morphology, which provides a method to optimize the energy output intensity distribution of water-jet guided laser.

Abstract: According to the self-synchronous theory with two vibrating electric motors, a translation elliptic shaker is designed, and its finite element model for the sieving box is established. The dynamic behavior analysis of the sieving box is reached with CATIA software. The natural frequencies and modal oscillation modes of the sieving box are calculated, and the stress and deformation distribution in every part of the sieving box under rated load are obtained. All shows that, its structure design is reasonable. Under the designed working conditions, the maximum principal stress of the side boards is 39.7 MPa, and its dynamic strength is satisfied. The calculating results will be of significance to the design improvement, and give a basis for the experiment research of dynamic strength.

Abstract: Kerosene based magnetic fluid which use kerosene as carrier liquid is characterized by better liquidity and higher magnetization which is qualified enough to use in magnetic fluid based inclination sensor. This paper provides several preparative parameters to control the physical property of kerosene based magnetic fluid during manufacture processing which use ferrous chloride and ferric chloride as forerunner reaction mass. The results show that the proper consistency of ferrous chloride and ferric chloride is 0.6mol/L. Secondly, the saturation magnetization of magnetic nano-particles is highest when the molar ratio between trivalent iron ion and bivalent iron ion is equal to 1.75. Thirdly, the proper reacted temperature is between 60~80°C and pH value should be controlled in a weak alkaline situation while six hours should be necessary for surfactant encapsulated enough around the magnetic nano-particles surface. At last, the saturation magnetization of kerosene based magnetic fluid increases with the increment of density and viscosity of magnetic fluid.

Abstract: In magnetic-electrochemical compound polishing, adding a magnetic field whose direction is parrallel to the electrical field’s directions and is charged alternatively, the velocity of changed particles cannot be accelerated obviously and the efficiency of chemical reaction cannot be promoted consequently, but the chemical reaction is well-distributed and the effect of the polishing is improved. In the paper, the velocity equation and loci equation of the charged particle in electromagnetic feild is concluded and analysed in magnetic-electrochemical compoud poshing in which an alternative direction’s magentic field is added. To be compared the charged particles in alternative direction’s magnetic field with the charged particles in static magnetic field carefully, the conclusion above is obtained. Moreover, a magnetic-electrochemical compound polishing head which can change the magnetic field’s direction easily is developed. At last, the conclusion is tested.

Abstract: The paper makes a comprehensive study on the sensitivity of a new type strain sensor named polymer-matrix carbon fiber smart layer. The sensitivity to tensile strain was gained by a uniaxial tension test. By a three-point bending test on a FRP bar stuck by the smart layer, the sensitivity to compressive strain was revealed and a lower gauge factor was obtained compared to the sensitivity to tensile strain. In addition, a pure shearing test was designed, revealing the sensitivity to shear strain.

Abstract: The scale effects on free vibration of micro-plate under the different boundary conditions are studied in this paper. The vibrating differential equation is presented based on modified Cosserat theory and Hamilton principle .The numerical solution is obtained using differential quadrature method. The results show that scale effects is highly significant on the natural frequency when characteristic length and thickness are close, and the natural frequencies increase along with the increase of characteristic length. Additionally, the thickness has significant influence on scale effects and the aspect ratio doesn’t affect.

Abstract: As a purpose of developing micro-actuators driven by liquid crystals, transient behaviors of a nematic liquid crystal between two parallel plates under an electric field have investigated numerically by using the Leslie-Ericksen theory. Twist angle has been selected as computational parameters. Imposition of an electric field on a liquid crystal induces backflow whose profile and magnitude depend strongly on the twist angle of the director. When the twist angle is 0 degree, the induced flow is planar, and with increasing of the twist angle, the flow has an out of plane component, and finally the profile becomes unidirectional when the twist angle reaches 180 degrees.

Abstract: Aiming at the phenomenon that box parts had large deformation and highly centralized stress in working process, CAE technology based on platform ANSYS Workbench (AWE) had been used on the box for finite element analysing and structure optimizing.Based on illuminating the structure of AWE system, the total deformation, equivalent stress and safety factor of box under static water pressure were analysed and the stress distribution was gained. Based on this, the optimization methods of welding angle angle irons and changing the installation position of supports had been proposed, and the box after optimization had been analysed. The results show that the box had high safety factor,uniform stress, small deformation, superior performance after optimization and it also can fully meet the operating requirement.

Abstract: Activated nitrogen-enriched carbon/reduced expanded graphite composites (ANC/REG-c) with different composite ratio were prepared by in-situ polymerization, carbonization, activation and reduction of aniline and expanded graphite. These were characterized by XPS, SEM and electrochemical measurements. XPS shows that N atoms exist in the ANC and ANC/REG-c. Compared to mechanical mixture of ANC and REG(ANC/REG-m), ANC/REG-c shows lower resistance and higher C_p1 (185.4 F/g) vs 124.3 F/g of ANC/REG-m measured by CV due to the introduction of the composite sturcture. When the composite ratio of ANC/REG-c is 6:1, the ANC/REG-c shows the highest C_p1 (264.0 F/g) and its symmetric supercapacitor also shows the best synthetical electrochemical performances. The optimal supercapacitor presents good cycle stability. ANC/REG-c is a suitable electrode material for supercapacitors.

Abstract: Among the functional materials, the ecological environment material is a new kind of materials. The ecological environment materials used in water pollution control process can be used as catalyst, absorbents and catalyst carrier. The functional materials investigated in this study were γ-A1₂O₃, ceramisite pellet, γ-A1₂O₃ loaded with nano-TiO₂ and ferric hydroxide, respectively. The performance of these materials and the efficiency of organic pollutant removal in high voltage electric field with these materials in the reactor were studied.