Advanced Materials Research Vols. 538-541

Abstract: The Micro agglomeration process of liquid inclusion particles in static steel was simulated based on VOF model of fluent software. The results were indicated that: two liquid inclusion particles, which are apart from a certain surface distance, can aggregate into a larger new inclusion particle; in order to promote liquid inclusion particles aggregate and accelerate inclusions flotation to be removed, the following measures can be taken: shortening the inclusion particle surface spacing, reducing the steel viscosity and controlling the composition of liquid inclusion in high interfacial tension area.

Abstract: Domain wall motions and magnetization reversal processes in the nanoscale asymmetrical Co₅₀Fe₅₀ rings have been studied using micromagnetic simulations. The results reveal that the switching fields and the plateau width of vortex state can be tuned through changing the asymmetrical parameter of magnetic nanorings. The chirality of vortex states can be easily controlled by the orientation of the applied magnetic field.

Abstract: The formation of linear explosion formed penetrator(LEFP) from linear shaped charge detonated from one end point was studied both theoretically and experimentally, and a numerical simulation was also carried out. By decomposing the detonation velocity vector into spherical and slide components, the theoretical model described the tip velocity change of LEFP. The numerical model illustrated the formation of LEFP and the tip velocity agreed with the theoretical model. The validation of the theoretical and numerical models was verified by experiment, in which steel targets were used to show the effect of LEFP. The results showed that average tip velocity was 2658.4 m/s at 100 mm to the charge mouth. The theoretical and numerical velocity values and distribution curve were very close to the experimental ones. This work may further develop the theory of LEFP and linear shaped charge.

Abstract: Taking the sand bed as the simulated object, a pore network model for drying of real porous media is developed by applying the invasion percolation theory and transport process principle, which fused the physical parameters of sand bed, such as porosity, pore mean diameter, pore size distribution, into the model parameters. The experiment and simulation results indicated that this model could explain the drying process of sand bed well. The throat size distribution has a great effect on the drying process.

Abstract: Cross wedge rolling hollow shafts with a mandrel has attracted much attention in the recent years because of the demand for light components. Finite element method was used to simulate the rolling process of hollow part and validated by experiment. By tracking strain change of the typical points and analyzing the strain contour maps of cross-section at four typical moments, the cause of cross section oval and shaft shoulder protuberance of part is expounded.

Abstract: Suzhou Light Railway Line 1 is used as a case history to investigate the effects of the non-homogeneity of soil, distance to the tunnel and cushion cap on the pile foundation performance including horizontal displacements, settlements, axial forces and bending moments. According to behaviors of the single pile and pile group under different concentrated loads, it is concluded that with tunneling, the loaded pile foundation will rotate toward to the tunnel and their bearing capacity is influenced significantly.

Abstract: 3D Model of the Automobile clutch cover assembly test bench pusher is built by SolidWorks and then the whole system is transferred to the software of ANSYS. Use of ANSYS software receives the figure that distribution of the displacements and stress, and investigates the usual dangerous section of the pusher in theory, then gets the first ten intrinsic frequencies and the vibration model, and analyzes the actual vibration of the pusher. The result of static analysis showed that the pushing board design is rational and its deformation is in reasonable range. The result of model analysis showed that the pusher has not emerges of the gantry on dynamic performance.

Abstract: Insulating ceramic materials has been regarded as one of leading materials that promotes the industrial progress of the 21^st century due to its unique electric and magnetic functions, and its special qualities such as high hardness, wear resistance, high temperature resistance and high pressure resistance also help a lot. Yet its modeling process is quite difficult. The traditional method is to grind it with a diamond after sintering into a certain shape. However, the low efficiency and the high cost certainly affect its widely application. Over the past 20 years, EDM has developed rapidly in ceramic material processing application, and EDM of conductive ceramic materials has become more and more practical. EDM is of the highly nonlinear characteristic, and it is quite difficult to use any specific mathematical expressions to describe its technological system, therefore, the developing trend of the researches in this field lies in the studies of its processing characters and its simulation techniques, of which, the artificial neural network, as a new technology, has provided an effective way for the further researches of EDM. It uses the computer to do a certain abstract, simplification and simulation of the functions of human brain, which can constitute a highly nonlinear large-scale continuous dynamic system. This paper employs the BP (Back Propagation) algorithm of the artificial neural network and makes the result of the orthogonal experiments on the processing technology effect as the learning samples of neural networks, thus establishes the simulation model of the multi-objective technology effect in EDM of insulating ceramic.

Abstract: This paper chooses the WYL50 excavator as an example, using Solidworks to get the 3-D model and assembly. Then it will use overall finite element analysis method to analyze the strength and deformation of the working device which is under a typical working condition through the ANSYS Static analysis module. The stress and deformation cloud chart is acquired. The analysis results provide the design and improvement of the excavator with theoretical basis.

Abstract: A study of application for Multi-objective particle swarm optimization algorithm in tanker conceptual design is researched in the paper. The tanker synthesis model with effectiveness and cost as its objective is considered in optimization model. The Pareto solutions are calculated based on Non-dominated Sorting Particle Swarm Optimizer (NSPSO). The example shows that the uniformly distributed Pareto front is obtained by using NSPSO.