Advanced Materials Research Vols. 189-193

Abstract: Based on the photo-elastic method, four groups of different ratio light elastic-plastic material were prepared by changing the epoxy resin, the firming agent, the plasticizer mass ratio; and the light elastic-plasticity material stress-strain curve and its elastic modulus E and Poisson's ratio were obtained through the stretch experiment. The light elastic-plastic rail models were made by 1:5, and the computation analyzes stress distribution of the rail head of the heavy rail and carried on the static examination. The stress stripe chart change rule of the light elastic-plasticity material during load and unload process was observed.

Abstract: The test here is to simulate the process of flat and vertical roll from Baogang heavy rail using the finite element, which analyzes the steel, the high strings, the initial stress and straightening process effect on residual stress. It is concluded that the discipline among the steel, the high strings, the initial stress, straightening process and residual stress.

Abstract: Nowadays, the workers in automobile service enterprise use their experience to decide the using limiting clearance between crank pin and bearing bush. It is not enough to be scientific and accurate and it has caused waste on the manpower and financial resources. By using the theory of finite element and getting help from the large analysis software ANSYS, this paper calculated the limiting value of fit clearance between the crank pin and bearing bush scientifically which is in some engines belonged to the vehicle types of Volkswagen. Based on calculation, it has been found that the using limiting value of fit clearance between crank pin and bearing bush was generally small. The analysis and calculation in this paper has guiding significance to the development of automobile maintenance trade.

Abstract: This research to carry on the 3D model of electro-magnetic-mechanical forming analysis, its goal is lies in discusses the magnetic force which electric current produces the influence which creates to the plate, like distortion, stress and so on aspects. But before the analysis, establishes the 3D model first, in converges in ANSYS, gives the material parameter, the boundary condition and so on, then carries on the solution, subsequently obtains the analysis result. Knew by the analysis result, in approaches corner on the U shape coil dull position, its amount of deformation is the maximum value, and stress maximum value also in corner.

Abstract: Understanding the micro-mixing of electroosmotic flow is of both fundamental and practical significance for the design and optimization of various microfluidic devices to control fluid motion. In this paper, the governing equations of the micro-mixing in rough microchannels with rectangle surface roughness are solved using the finite element method and the effects of roughness height and space on mixing efficiency are investigated. The results indicate that the effects cannot be ignored and the mixing efficiency increases with the roughness element height and density.

Abstract: The hot deformation behavior of Cu-0.35Cr-0.15Zr (wt.%) alloy was investigated by hot compression tests using a Gleeble-1500D thermal simulator system. The tests were performed under the conditions of 700°С- 820°С temperature and 0.01-10s-1strain rate. The results show that the flow behavior of the studied alloy could be described by the hyperbolic sine constitutive equation, and an active energy of 597.53 kJ/mol was calculated. The processing maps were obtained and analyzed according to the dynamic materials model. The optimum processing parameters of hot deformation of this alloy in the range of this experiment can be attained by the maps. The hot deformation temperature was 800-820°C and the strain rate was 0.01-0.1s^-1.The instability zones of flow behavior can also be recognized by the maps.

Abstract: The anisotropic plastic behavior of metallic sheet has a significant influence on spring-back, and is usually modeled by anisotropic yield function in numerical simulation. Material parameters of anisotropic yield function are generally identified either by yield stresses or by r-values, or both of them. For Hill1948 and Yld89 anisotropic yield functions, r-values are still widely used to calibrate their material parameters in spring-back prediction. Here, yield stresses and r-values were respectively used to calibrate them, and the differences of the spring-back simulated by these two identification methods were discussed. To evaluate their accuracy, the simulation results were compared with the spring-back calculated by Yld2000-2d anisotropic yield function. The result shows that when yield stresses were used to identify the material parameters of Hill1948 and Yld89 yield functions, the simulated spring-back was closer to that of Yld2000-2d yield function.

Abstract: Nowadays, IC manufacturing meet the challenges of physical limits, through silicon via(TSV) technology has increasingly become the focus of the microelectronics industry due to its shorter wiring route, better signal integrity, larger bandwidth, lower power consumption and smaller packaging size. In this paper, the transmission performance of TSV was analyzed and the impact of ground vias number, diameter and pitch with TSV on TSV transmission performance. A design of experiment (DOE) was established to investigate the impact of different ground vias parameter combinations on the transmission of TSV and the range analysis of the experiment results was executed. Based on the DOE, two regression equations were formed to estimate the electrical performances of TSV. From the two equations, the structure parameters were optimized, the S11 and S21 results of optimization parameter combination reduced 0.4dB and 0.15dB, respectively.

Abstract: By using Fluent software, the mathematical model of temperature field is established on directional solidification process for large-scale frustum of a cone ingot, and the result is analyzed by Origin software, Tecplot. The influences of different width/thickness ratio to directional solidification process of cone ingot are discussed in order to provide basis for design optimization and ingot quality improvement.

Abstract: In this study, a prediction model based on support vector regression (SVR) to describing the complex nonlinear relationship between the purity of the resultant (Mg-Al-hydrotalcite) and the raw material amount of reactant (NaOH, Mg²⁺ and Al³⁺) was developed. And the partarticle swarm optimization (PSO) algorithm was employ for optimizing the parameters of SVR model.The predicton results from SVR compared with that of BP (back- propagation) neuarl network prediction model by applying identical training and test samples stongly support that, SVR-based predictive model for Mg-Al-hydrotalcite purity is feasible and effective.This study suggest that SVR may be an efficient and novel methodology for conduct the productive process to produce synthetic hydrotacite in high purity and in high yield.