Advanced Materials Research Vols. 383-390

Abstract: Focusing on the severity of asphalt pavement surface crack, a finite element analysis model of 20-node isoparametric elements was established by the commerce FEM software ABAQUS with the base of fracture mechanics theory. The surface crack of pavement was numerical analyzed and the crack propagation life was evaluated by Paris formula. In the course of surface crack propagation the change of the stress intensity factor (K2) was discussed and the effect of pavement parameters on surface crack fatigue life was studied. The analysis indicates: (1) the propagation of surface crack is dominated by deflection load. In the course of crack propagation, at first K2 increases to the top then drops down slowly. (2) the important influence factors to the surface crack propagation life at the scope of road structure parameter, are thickness and modulus of surface course, the modulus of base course. But modulus of subgrade, thickness and modulus of subbase course and thickness of base course are of no effect.

Abstract: In order to improve the quality of semi-trailer tanker design, shorter the development cycle, lower cost, and combine with structural features of its own semi-trailer tanker, the use of modular design theory, a module partition, structural analysis and interface settings and other methods of semi- trailer to the overall structure of tanker design the general framework of semi-trailer tanker. With the UG/OPEN and Microsoft C++6.0 development tools, parameterize the parts of semi-trailer tanker. Developed in the context of the semi-trailer tanker UG rapid design system design module, and verify its feasibility.

Abstract: The Variable Torque Slipping Clutch with Skewed Rollers is a new type of power transmission component, which combines both clutch and bearing functions, and has broad application prospects in industrial products. This paper describes its configuration, operating principle and characteristics. The present situation of its study and application at home and abroad and key issues needed to be further studied are also introduced.

Abstract: Based on the just in time idea, a production planning model is established in the steel-making and continuous casting. In the model, with sequence casting constraint, the objective is to minimize the operation conflict time and the deviation time of punctual delivery. Then a hybrid GA combined the backward inferring algorithm with GA is presented to solve the model. As the delivery time, the start time of each charge on each working stage is obtained by the backward inferring algorithm. GA is applied to search the suitable start pouring time, select the reasonable operation time and transportation time, assign the feasible processing unit, and evaluate the optimization production plan. The test with the production data in a steel plant shows that the model and algorithm can draw quickly a high-quality and performable production plan, and the average staying time of the production plan is about 7% shorter than that in a practical process.

Abstract: In this paper, a creep test was carried out for simulating the creeping of the core of the mudstone under condition of deep formation subsurface conditions by MTS-810 test system, the creep rule and the characteristic parameters of the mudstone formation were obtained from the experiments. According to the test results, the finite element model for casings load calculation was established, and the calculation program was also written. With the program, the casing load of one western oil well was calculated in mudstone formation. The numerical simulation results show that the casing load has a relationship with phase angle θ and creep time, and the casing load is 10% greater than the stress in situ.

Abstract: The integration credibility model of the component is constructed by inspecting the sub-attributes of the component and calculated by summarizing the probability with experience. The component is quantified from its reliability, usability, testability, security and maintainability thus providing a numerical measurement method that is directly comparable. According to the component’s integration credibility, the component customers select the component from the database to reduce the risk of the system integration.

Abstract: The levels of continuous casting process of copper and copper alloy billet have many advantages, such as taking small footprint, low investment and the shorter flow. Recently, it develops very quickly all over the world. This article designs the dummy body drive control system based on the DSP digital signal processing chips, inverter and variable speed induction motor, and uses the unique process that space vector pulse width modulation strategy can achieve continuous casting horizontal tractor’s four beats to realize continuous casting process’ high-quality, stable and reliable implementation. Early in the 19th century, German Bismarck had proposed a continuous casting process in his patent. The development of this method in the copper industry began in 1940s, the type of equipment went through belt type, vibration mold, vertical traction type, tilt casting type and Horizontal traction type [1, 2]. Now, horizontal traction, as the most popular method abroad, because its products don’t need straightening, and consistency of properties along the length and high density of grain lead to the improvements of mechanical properties and electrical properties, its superiority in product quality and production efficiency is obvious. The design combined the modern AC variable speed control and advanced SCM control technology and traction continuous casting process to design a Speed controller of horizontal continuous casting of copper traction motor, its performance is similar with to dummy industrial control computer and AC servo motor drive control system, but the configuration of the hardware is less than half the price.

Abstract: The analytical solution of a single pipe piles under axially and laterally loads is presented, when the laterally loads is optional free load. As piles foundations are becoming a preferred foundation type, piles usually work under simultaneous axial and lateral loads in engineering. To analyze the function of free loads to pipe piles under inclined loads conditions, in the basis of ‘m’ method, deformation differential equation of elastic piles under inclined loads is established first in the paper with analytical method. Differential equation has two parts in according to the piles in the earth or in the air, and lateral deformation, obliquity, moment; shearing force of the piles can be gotten respectively by soluting equations. In the end of the paper, influences of several parameters is analyzed of the top axial loads, the top lateral loads and the free loads, and their influence curves are given.

Abstract: A three-dimensional nonlinear elastic-plastic finite element method had been developed to study the bending behavior of piles subjected to axial load and lateral soil displacement. The influence of the lateral soil displacement, axial load level and the cap of piles were studied and variety law of the bending behavior was presented. The study showed that the bending moment increased with the lateral soil displacement. The displacement at the soil surface and the maximum bending moment of pile also increase with the axial load. The cap of piles has a great influence on bending moment and displacement of pile group.

Abstract: This paper discusses the feasibility of vacuum casting of micro-gears by using silicone mould of micro-gears which was designed and manufactured by the author. Orthogonal experiment is adopted to explore the influence of temperatures of mould, resin and solidification and the time of vacuum deaeration upon the shape and size of micro-gears. The result of research shows that formed parts with high precision can be obtained by vacuum casting of micro-gears with silicone rubber mould, and the time of vacuum deaeration greatly affects the shape and size of formed parts of micro-gears