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The service life of hot forging die is mainly decided by Stresses, including thermal, mechanical and combined stress. Stress amplitude is affected by the material properties, such as specific heat capacity. The choice of die material is very importance for improving die service life. In order to identify the effect of specific heat capacity on die stress, a 2D FE model of cake shaped workpiece is...
A method for predicting dynamic stability limit of thin-walled workpiece high-speed milling process is described. The proposed approach takes into account the variations of dynamic characteristics of workpiece with the tool position (or machining time). A dedicated thin-walled workpiece representative of a typical industrial application is designed and modeled by finite element method. The curvilinear...
Metal Rubber is special materials and used in aerospace, especially under extreme conditions. It has characteristics of strong adaptability, corrosion resistance, radiation resistance and designability. In this paper, we have manufactured Metal Rubber components, and done some research on the influence of previous deformation to Metal Rubber material's structure and performance, its characteristic...
Aimed at structure retrofit of sprocket shaft, combining with the practical working conditions, theoretical calculation, finite element method (FEM) Analysis and model test are applied in research. The results show, numerical value of traditional mechanical algorithm is relative small, FEM can express the influence of actual structure, and results are more reliable. FEM Analysis represents stress...
This paper analyzed the structure and principle of a regenerative electromagnetic shock absorber in detail. The innovative shock absorber resembles linear generator in principle and can generate electric power through the relative reciprocating motion between coil assembly and permanent magnet assembly. At the same time, the damping can remove discomfort caused by road roughness. The regenerated electric...
In order to develope the suitable friction materials of Tunnel Boring Machine (TBM) clutch plate, the temperature field of contact interface was established by Finite Element Analysis (FEA) software ANSYS. The simulation results shows that the highest temperature at the friction interface is approximately 370□. At the sliding interfaces, the heat-affected region of friction facings is far less than...
To improve the quality of the self-lubricating spherical plain bearing, a new technology of Two-way neck forming process for the manufacture of the self-lubricating spherical plain bearing was brought out. The shape of the bearing out ring blank was optimized by the parametric finite element method to minimize the necking force in the bearing neck forming process. The two-way necking die was designed...
Anti-flood Spiral pile driving system which consists of spiral pile and spiral pile driver is developed to solve the problems of the traditional woodiness pile driving system in flood preventions. With the gradual application of spiral pile in flood preventions, better spiral pile is needed to design and a more stable driver system is required. In this paper, ANSYS / LS_DYNA is used to build up spiral...
Elastic colloid is a kind of fluid which compression ratio is large under high pressure. It can reduce complexity and volume to apply the elastic in recoil mechanism. The article designed the physical model of recoil mechanism based on elastic gel, made finite element mesh for the model, and build the mathematical model for calculating the fluid movement, conducted a numerical simulation for the flow...
General profiles chosen from worn wheel profiles and railheads (briefly, worn wheel and rail profile) measured by wheel-rail profile admeasuring apparatus were used to build the finite element models, and the new/worn wheel-rail contact problems were analyzed respectively on the tangent and curved track. Variable regulations of contact area's size, shape and position were generalized. The results...
The Discrete Element Method (DEM) is widely used in the simulation of a particle system. The viscoelastic contact models are the most common ones in the DEM simulation. However, these models stills have a few unrealistic behaviors, which will influence the reasonableness and accuracy of the simulation results. A general form of damping coefficient is proposed through dimensional analysis, and the...
Linear-spring dashpot model is one of the major contact models applied to the DEM (discrete element method) simulation of the tumbling ball mills. The model parameters such as stiffness, damping coefficient, coefficient of restitution and coefficient of friction, significantly influence the calculation of contact forces and the selection of the critical time step. However, there is no standard as...
Irregularity of the fixed frog affects the passage velocity and the comfort of urban railway vehicles. To reveal this irregularity, based on the Finite Element Method (FEM) computational models were set up. The models included the contact between the worn tread wheel of Dalian tram and the 50kg/m rail as well as the different sections of No. 9 fixed frog. The results were used to find the laws of...
The aerodynamic characteristics directly affect driving characteristics, stability, operation, oil consumption, and safety of automobiles. The virtual wind tunnel experiment simulation based on finite element method has provided useful theoretical reference to automobile bodywork design. In this study, the air flow and distribution information around the automobiles was obtained using aerodynamic...
The impact resistance of windshield, especially under the high velocity impact, is very important for passenger's safety. In this paper, a SPH/FEM (Smoothed Particle Hydrodynamics and Finite Element Method) coupling method was used to analyze the high velocity impact process of windshield. The glass of impact side was discretized by SPH particles to describe the splash performance of glass fragments,...
The optimization design for a wheel was implemented in this paper. The rim stiffness finite element model, 13-degree impact strength finite element model and bending analysis finite element model of the wheel were established firstly. The influence of the rim stiffness, wheel impact strength and bending fatigue strength of the wheel were synthetically considered. The constrained variable metric method...
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