Applied Mechanics and Materials Vols. 55-57

Abstract: In this paper, the stress distribution of short-fiber-reinforced composites (SFRC) using representative volume element (RVE) approach based on the finite element analysis (FEA) was presented. A three-phase model was built, in which loads were applied to the matrix. The influences of interphase parameters like Young’s modulus and thickness were studied. The FEA confirms that interphase Young’s modulus and thickness control stress distribution in SFRC. The stress concentration at the fiber interface becomes greater with high interphase Young’s modulus and thin interphase thickness. The FEA results were also compared with those obtained by analytic method.

Abstract: Sewage sludge incineration slag, the waste generated in sewage sludge incineration, was obtained from a sewage treatment plant in Guangzhou and used as a low-cost sorbent for removing Cu(Ⅱ) from wastewaters. The adsorption effectiveness and their factors of Cu²⁺ in aqueous solutions were simulated detailed using the adsorbents of the sludge incineration slag. The simulation contents and the factors included the adsorption time, the pH of solution and the dosage of adsorbents and so on. The results showed that at 30 °C, the adsorption equilibrium of Cu²⁺ can be achieved in 6h and the best pH value of the solution was about 4.5-5.5. The removal rates of Cu²⁺ were increased with the adsorbent concentration increasing and the optimal concentration of adsorbent was 20-30g/L with the initial concentration of Cu²⁺ less than 25mg/L.At the best adsorption conditions, the removal rate of Cu²⁺ reached more than 80% and the adsorption capacity was 0.83-1.25mg/g.

Abstract: High yield diglycerin borate(DGB) have been synthesized by the raw materials glycerol and boric acid in this paper. The structure of the products was characterized by FTIR and ¹¹B NMR. The yield of the products was discussed by reaction conditions that were material ratio, reaction temperature, reaction pressure etc. and then the optimum process conditions of preparing DGB was decided. In this condition, high yield DGB can be prepared which could reach more than 96%.

Abstract: In the process of the simulation FHMIPv6, build a reasonable experimental platform for experimental basis, based on the condition of network NS2 to construct an analog environment for its experimental requirements of the network environment platform and give script data.

Abstract: A technique for non-contact optical measurement of in-plane displacements based on correlation analysis is presented. This approach can be used to identify the position of a marker before and after deformation of a specimen or plane test-object. Some mechanical parameters of materials and strains can be calculated using information from several markers’ displacements. The method is simpler than other optical techniques in experimental processing and can efficiently used to measure large deformations. The precision of marker identification method is analyzed. And some discussion on this method is also given.

Abstract: Hardened stainless steels are materials widely used in the field of aviation and spaceflight. Machining of this materials with conventional cutting (CC) method is a real challenge compared to other difficult-to-cut materials. Ultrasonic elliptical vibration cutting (UEVC) method is a novel and non-conventional cutting technique which has been successfully applied to machine such intractable materials for the last decade. However, few studies have been conducted on the cutting force in ultrasonic elliptical vibration cutting of hardened materials. This paper presents an experimental study on cutting force in UEVC of hardened stainless steels using cemented carbide tools. Experiments have been carried out to investigate the effect of cutting parameters in the UEVC method in terms of cutting force, while cutting hardened stainless steels. The tests have revealed that the average thrust force,principal force and feed force drop to 3%,10% and 90% of CC value for UEVC of hardened stainless steels. The ratio between the CC force and the UEVC force decrease with the increase of DOC and cutting speed.

Abstract: An aircraft cable fault location method based on detection model is proposed to solve the problem of being difficult to inspect the fault for the civil aviation maintenance. In response to the condition of the experimental installation, the reference signal is designed. The fault of the cable can be located according to the reflected waveform. An aircraft cable fault location system is designed and the experimental results show that the method is rational and effective.

Abstract: Collaborative design is a new method for mechanical design and manufacture, how to improve the ability of design is the point problem. Data translation is a key problem for collaborative e design. In the paper, the problem of data translation is solved. Different design software for designer can complete the same task, which is based on the data transition and translation. The XML style of data is established, which is applied to express the relationship of data. The XML to STEP style is presented for system. Data can be transmitted among different software. The integration of system is established. At last, a prototype system is presented to demonstrate the methodology.

Abstract: In this article, computational fluid dynamics(CFD) method is used to predict the effect of blade numbers on the pressure drop of axial cyclone separators. A three-dimensional model is built to acquire the resistance of axial cyclone separators with different blade numbers. The flow field inside cyclone separators is calculated using 3D Reynolds-averaged Navier-Stokes equations. And turbulence model is used to simulate the Reynold stress. Also pressure drop of cyclone separators with different blade numbers is expressed as a function of different inlet velocities. At the same inlet velocity with increasing the blade numbers, pressure drops of cyclones reduce greatly. And changing the blade number of cyclone separator is an effective method to improve its resistance performance.

Abstract: The effect of pressures on microstructure and properties of as-deposited high silicon electrical steel by EB-PVD during hot pressing was studied. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the phase composition and morphology; the density and electrical resistivity were measured using the bottle method and four-probing method, respectively. It was found that the density increased from 7.25×10³ kg/m³ to 7.5 ×10³ kg/m³, while the electrical resistivity decreased from 85µΩ•cm to 75µΩ•cm with the increase of the pressure from 30 MPa to 60 MPa.