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According to the vehicle radar antenna pedestal turntable usage, this article analyzes and compares the structure characteristic of welding and casting. We decide to adopt the welding structure and use special welding structural form. Based on the turntable of using conditions, we analyze the deformation and stress of turntable by the finite element analysis software. The maximum deformation is 0...
Considering the influence of material original flaw, combining with Finite element analysis results and linear elastic fracture mechanics methods, the thesis gave a certain type of casting crane girder for example to analyze its fatigue life including the designing, remaining and service life based on fracture mechanics and the design principle of disrepair-security. It offers more reliable theoretical...
Along with our country electric power enterprise's vigorous development, the domestic electrical market tends to the standardization gradually. At the same time, high-parameters, high-performance, high-reliability current transformer who has an important role in power transmission device shortly supplies in the market. This article takes 40.5Kv plateau type and epoxy resin casting current transformer...
The fatigue of cast steel node with initial casting defects was studied by Finite Element Method (FEM) and fracture mechanics. The defects was simulated as cracks in the 3D FEM model and the stress intensity factor of crack tip was calculated. The shape factor function was fitted by the stress intensity factors of different crack length. The permissible defects size could be decided by the fracture...
By means of measuring creep curves, microstructure observation and FEM analysis of the stress field near the hole, an investigation has been made into the influence of the defects on creep behaviors and microstructure evolution of single crystal nickel-based superalloys. Results show that the creep lifetimes and plasticity of the single crystal nickel based superalloys are obviously decreased by microstructure...
Electromagnetic stirring (EMS) systems have been extensively used in the continuous casting process in steel-making industries to produce high-quality steel products. Although the operational principles of such EMS facilities are well established and extensively applied, demonstrations of actual stirring effects on molten metal are always desired for comparative investigations. To fulfill the requirements...
Elastic-plastic nonlinear finite element method(FEM) with large deformation and contact is applied to establish FE models respectively based on various process such as roll assembly, roll grinding and heating and pressing deformation in casting. Then the force and deformation are analyzed to get the roll profile curve in casting. The calculation results are verified with strip section shape, and the...
Mesh quality refers to the rational mesh geometry shape. Mesh quality will influence the precision of calculating, and poor quality will even stop calculation. Hypermesh is a finite element processor with high-performance; it can effectively solve the problems of FEM model establishment. This paper adopts Hypermesh to establish the complicated turbine blade FEM model; Not only the data integrity of...
H beam has been widely used in industry and civil steel structure. But there are many key technologies that must be solved in order to produce high quality H-beam. This paper describes an investigation into the rolling technology using MARC software to model reversing rolling process of H-beam and compare the results with PDA data. A FEM model involving in three-dimensional, elasto-plastic and thermo-mechanical...
Based on classical electromagnetic theory, the electromagnetic pressure calculation model and the formula of electromagnetic casting forming have been established. Theoretical and numerical results indicated that the frequency, current density, relative permeability of alloy melt and resistivity can also influence the effect of electromagnetic pressure. Meanwhile, the effect of metal physics properties...
In this paper, a reasonable creep material model used in FEM analysis for bulging of cast slab was determined based on the comparative results between simulation and experimental data. A thermo-mechanical coupling, creep and dynamic FEM model of continuous casting process has been constructed and applied to case studies. The analysis produces outputs such as the necessity of considering the case slab...
The static and dynamic performances for the whole casting column of a high-speed horizontal machining center are analyzed by ABAQUS FEA software. The stress, deformation distribution, natural frequency and the mode of vibration under different conditions are simulated. Then the structure of the column is optimized and analyzed. The results show that: (1) The maximum stress is 1.19MPa and the maximum...
For the arch ring used with concrete open thin-wall construction technology, the second phase concrete casting is needed after the two halves of the arch ring join together in the swivel erection in order to increase the thickness of the walls and bottom slabs. The newly-cast concrete that has not reached the design strength will cause the open thin-wall arch ring to withstand very great load, and...
The conflict between structure design and casting process of castings has been studied to make them have good casting structure feasibility. In this paper, it takes the use of structure and process integrated design based on simulation technology to resolve the conflict. Casting structure feasibility of aluminum axle box for the high speed train application, as an example, was analyzed by this means.
As a temporary extraordinarily structure, the large bridge elevated-pile cushion-cap suspension box-cofferdam is acted by static loads and dynamic loads. The structure with dimension of 120 m long, 52.3 m wide, 16.5 m high is in bad risk of failure after the first layer cushion cap concrete total 3 m high, gross weight 3.7 times 104 ton fluid body is poured. This paper calculated the stresses of steel...
A three-dimensional model of bolster of heavy haul freight train was set up in the ANSYS11.0 according to the Codes of AAR M-202-05, the stress distribution of the casting bolster was calculated and analyzed. The result shows that the fatigue strength of the bolster was adequate and the relative weak point was found out. On the basis, the actual measurement test of entire car when it was running on...
Temperature field of cast roll and its thermal deformation were studied during strip casting with elasto-plastic and thermal-stress coupled FEM in this paper. The simulation result was verified with experiment result, indicating that the simulation result is accurate. Then, the initial profile were designed according to the simulation result, and optimized using finite element method (FEM) to make...
Combining classic rolling and casting theory and finite element method (FEM), a rolling force controlling model has been deduced in twin-roll strip casting, which considers the influence of casting velocity and melt level. After accuracy certification, the model has high precision under given conditions, and it can be used to set initial parameters before strip casting and can be used to adjust correlative...
In this paper, a 3-dimensional mathematical model has been developed for the thermo-mechanical coupled analysis of the solidification process of carbon steel in funnelshaped mold using thermo-elastic-plastic finite element method (FEM). The major application of the model is to perform computations of temperature, stress and longitudinal cracking index (LCI) variations in shell. The effects of casting...
Application research on Mold Temperature Control (MTC) technology in casting was done based on Finite Element Method (FEM). A MTC forming process is presented here. The mathematical models of numerical computation are established, including heat transfer differential equation and its equivalent integral formulae and FEM combined equations, boundary conditions, processing method of MTC units. The numerical...
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