Advanced Materials Research Vols. 189-193

Abstract: In recent years technology manufacturing is expanding daily. Modern machining industry has found a special place. The separation chip forming process, pieces produced. Selection tool this role in determining the quality and cost of production is part. Predicted forces from entering the tool are important. Experimental measurement of tool forces entered by the dynamometer is time consuming and expensive. For modeling machining finite element method (FEM) with fundamental criterion Johnson - Cook for Aluminum alloy 5083, software ABAQUS was used. In this paper rake angle, speed of cutting and force cutting during chip forming were discussed. Research shows that the simulation results are consistent with experiments. Simulation capability provided accurate predictions of forces into instruments for Aluminum alloy is 5083.

Abstract: To design an electrochemical machining (ECM) cathode for machining the mixed rifle with large spiral angle and the experiments are difficult, it takes a long period. Visual C++ was adopted to simulate the process for machining rifle as cathode moves according to the Ballistic equation. The models of 3D working tooth on cathode and the processing environment were built and the arithmetic was established. The length of working tooth was initialized. Having compared above points with design parameter, the parameter of cathode’ working tooth will be modified till it be close to design parameter. At last the result for appropriate parameter of cathode’ working tooth was proposed.

Abstract: In order to improve the efficiency and accuracy of the prediction of expressway traffic flow, this paper, based on the characteristics of the data of the expressway traffic flow, focuses on an optimized method of prediction with the application of the neural network with genetic algorithm. Applying genetic algorithm, optimizing BP neural network structure and establishing a new mixed model, this algorithm speed up the slow convergence velocity of traditional BP neural network prediction and increases the possibility to escape local minima. This algorithm based on the optimized genetic neural network predicts the actual data of the expressway traffic flow, the result of which shows that the application of the optimized method of prediction with the genetic neural network algorithm is effective and that it improves the rate and the accuracy of the prediction of the expressway traffic flow.

Abstract: Bulge forming is a novel process aimed at common products including T-branches, cross branches and angle branches. But bulging forming has not applied for two-head abnormity-shaped hollow screw rotor reported in literature. Simulation of the bulging forming of two-head abnormity-shaped hollow screw rotor has not been reported. This paper presents a simulation of the bulge forming process of two-head abnormity-shaped hollow screw rotor using a variable cross-section solid bulging mold. Some conditions including the effect of friction, boundary conditions, contact conditions and the space motion, etc are presented. The mathematical model of three-dimensional finite element analysis has been established. The distribution of generalized plastic strain and general metal flow mode in cross section of two abnormity-shaped hollow screw rotor has been analyzed. It is an effective method for the analysis of other defects and the optimization of process parameters further.

Abstract: The paper studye the effect of shrinkage and creep on the cable-stayed suapension bridge. In order to research the static action of cable-stayed suspension bridge, two plane models of Jinzhou Bay Bridge is analyzed under shrinkage and creep by using general FEM software. One is a self-anchored bridge and the other is an earth-anchored bridge. The differences in static behavior between the two bridges are compared in detail. The results indicated that the shrinkage and creep effects have great influences on both bridges, and the effects have greater influences on self-anchored system than earth-anchored system. In addition, the author analyzes the causes of these differences between the two bridges. In conclusion，shrinkage and creep have some effect on the bridge displacements and internal forces. It is an important factor which can not be ignored in the design.

Abstract: The work presents results of research loss of energy in timing belts depending on materials used for their production. Design of composites and usage of new polymer materials allows for improvement of constructional properties of belts.

Abstract: The experimental machining and finite element modeling of 2D turning of AA5083 is presented. The ABAQUS/Explicit machining simulation software is applied for the finite element modeling. The experimental orthogonal machining for were conducted to investigate the effects of various machining parameters on chip morphology, machined surface condition, and resulting cutting forces. The measured cutting forces was compared to finite element modeling results with good agreement. The effects of cutting speed and rack angle of tool cutting factor for productivity in AA5083 machining, depth of cut, on the peak tool temperature are investigated. 2D Finite Element Model (FEM) of chip formation process, set up with an Arbitrary Lagrangian-Eulerian (ALE) formulation, proposed in the software ABAQUS/Explicit .the thermo-viscoplastic behavior of the workpiece material is modeled by the Johnson-Cook (JC) constitutive law. This study explores the use of experimental and finite element modeling to study the cutting force. Results of this research help to guide the design of new cutting tool materials and coatings and the studies of chip formation to further advance the productivity of AA5083 machining.

Abstract: For meeting the requirements of high-precision and high-speed in on-line detection for strip and plate’s internal defects, in the paper, based on elaborating methods and principle of conventional ultrasonic testing, the research status of traditional ultrasonic testing technology and non-contact ultrasonic testing techniques, there analysis and discuss the problems and causes in the process of detection. In the end, the trend of development is given.

Abstract: The In₁₀Ge_xSb_52-xSn₂₃Te₁₅ films (x = 2, 5, and 9) were deposited on nature oxidized silicon wafer and glass substrate by dc magnetron sputtering. The ZnS-SiO₂ films were used as protective layers. The thickness of the In₁₀Ge_xSb_52-xSn₂₃Te₁₅ film is 20 nm. We have studied the crystallization kinetics, structural and optical properties of the In₁₀Ge_xSb_52-xSn₂₃Te₁₅ (x = 2, 5, and 9) recording films. It is found that the crystallization temperature of the film is increased with increasing Ge content. The optical contrasts of In₁₀Ge_xSb_52-xSn₂₃Te₁₅ films with x = 2~9 are all higher than 30 % at a wavelength of 405 nm, showing that the films are suitable for blue laser optical recording media application.

Abstract: In this paper, the influence of the local dented plate on ultimate strength is analyzed, and reliability calculation and sensitivity analysis expressions of the plate element with local dents are also proposed. For the structure system consisting of local dented plate elements, reliability analysis is developed, the calculation method of the global reliability index and sensitivity expressions of the reliability index are proposed. Finally, taking a numerical example of a cabin section of ship structure compares and contrasts reliability analysis of the structure system with the local dented plate with that of the system without the local dents. The method proposed in this paper provides a reference for the maintenance and renewal of structure system in use.