Papers by Keyword: Finite Element Method (FEM)

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Authors: Wen Liu, Teng Jiao Lin, Ze Yin He
Abstract: The shock spectrum of gearbox was gotten according to German specification. And the equivalent time-domain acceleration curve was converted from shock spectrum. After the dynamic finite element model of entire gearbox was established by using the truss element, spring element and tetrahedral element, the shock response including the vibration velocity, acceleration and dynamic stress of gearbox subjected to the acceleration shock excitation were simulated. At last, the anti-shock performance of gearbox was analyzed combining with the strength criterion.
Authors: Hou Kui Fu, De Bo Lu, Zi Guo Li
Abstract: In-situ observation of stress in Al interconnects under electromigration and thermal effect by using the synchrotron radiation x-ray diffraction. The test temperature was controlled by changing the current density of W (self-heating structure). The EM-induced stress was also investigated with current densities from 3x105A/cm2 to 4x106A/cm2.The conclusion agreed well with the simulation results.
Authors: Yan Ping Sun, De Chen Zhang, Ming Yang, Yuan Li
Abstract: In this paper, iron ladle stress and deformation has been accurately calculated using finite element analysis software ANSYS based on 260t iron ladle in standing, lifting, tipping working conditions. Distribution of stress field was obtained. The stiffness and strength of the iron ladle has been evaluated. The results show that the iron ladle in the standing, lifting and tipping working conditions, structural deformation is small, the strength and stiffness meet the requirements. This research extends the working life of 260t iron ladle. It provides theoretical basis for producing and using of the iron ladle and further optimal designing.
Authors: Di Ping Wu, Ting Yu, Qin Qin
Abstract: Roller leveling of plate with lateral defects is a complex process in which materials longitudinal strain couples with the transverse one. Different from wavy defects, lateral buckling defects are plates' macroscopic deformation because of stress or fiber length difference between up and down surfaces of the plate. Aiming at plate roller leveling process,a simplified 3D cantilever bending FEM model has been suggested in this paper. In the model, plates longitudinal bending and lateral warping are decoupled by using ABAQUS element deactivation function. Moreover, the mechanism of roller leveling process for plates with lateral buckling defects has been developed. On the basis of comparing with the ideal flat plates' bending process, effects of technological parameters such as reduction, roller diameter and roller shape on the lateral buckling defects correction during roller leveling process are also studied.
Authors: Ze Yu Wu, Xin Li Bai, Bing Ma
Abstract: In finite element calculation of plastic mechanics, isotropic hardening model, kinematic hardening model and mixed hardening model have their advantages and disadvantages as well as applicability area. In this paper, by use of the tensor analysis method and mixed hardening theory in plastic mechanics, the constitutive relation of 3-D mixed hardening problem is derived in detail based on the plane mixed hardening. Numerical results show that, the proposed 3-D mixed hardening constitutive relation agrees well with the test results in existing references, and can be used in the 3-D elastic-plastic finite element analysis.
Authors: Cong Shi, Yong Huang, Rui Liu
Abstract: In engineering practice, there is an increasing application of ram-compacted pile composite foundation for its economical and environmental consideration. In order to forward settlement property research of ram-compacted pile applied in high-speed railway deep soft ground treatment for the first time, and based on ram-compacted pile settlement data of trunk embankment near Beijing-Shanghai high speed railway Langfang station, this paper starts from 3D FEM analysis and provides the study on ram-compacted pile settlement characteristics. What more, settlement prediction using 3D FEM analysis is proved to be applicable and effective.
Authors: Piotr Szota, Sebastian Mróz, Henryk Dyja, Anna Kawałek
Abstract: Numerical modelling of the round bar rolling process, while considering the wear of the passes depending on their shape, was carried out within the present work. For the theoretical study of the rolling process, the Forge2008® was employed, which is finite element method-relying software that enables the thermomechanical simulation of rolling processes in a triaxial strain state. The wear model implemented in the Forge2008® permits no quantitative evaluation, but only comparative analysis of the wear of rolls. In order to use the results of simulation employing the simplified Archard model for the quantitative evaluation of roll wear, it is necessary to define the wear factor and hardness of the tool as a function of temperature. The paper present a methodology for the determination of the quantitative wear of rolls based on the results of computer simulations performed using the Forge2008® software for a selected round pass during rolling of round bars.
Authors: Kyung Hee Park, Dong Yoon Lee, Ki Hyeong Song, Seok Woo Lee
Abstract: An FE model can be usedfor better understanding the micro cutting process. To identify an edge wear effect, the cutting forces and contact stress on the cutting tool were measured as edge wear progress. On the other hand, a series of orthogonal cutting tests was also carried out forcomparisonwith FEM simulation results in termsof chip formation and cutting forces. A scanning electron microscope (SEM) was used to observe the tools and chips for the purpose of taking measurements. A Kistler dynamometer was also utilized for cutting forces measurement. The FEM micro cutting simulation showed good agreement with experimentalresults in terms of the cutting forces and chip formation. And it was observed in both FEM simulations and experiments that larger edge wear caused higher cutting forces.
Authors: Ji Jue Wei, Sen Kai Lu
Abstract: The magnetic fields in the 320 kA Al reduction cells have been calculated using ANSYS. The calculated results show that the magnetic field lines are concentrated in the cell wall; the magnetic fields in the Al reduction cell form a clockwise swirl along the Z-axis; the magnetic field strengthen in the corners; the vertical magnetic field value of the Al reduction cell is slightly higher. The range of BX, BY and BZ is -0.048~0.145 T, -0.046~0.292 T and -0.183~0.196 T in the Al of the Al reduction cell, respectively. The range of BX, BY and BZ is -0.183~0.348 T, -0.447~0.515 T and -0.350~0.225 T in the electrolyte of the Al reduction cell, respectively. The range of BX, BY and BZ is -0.020~0.035 T, -0.014~0.016 T and -0.015~0.028 T on the interface of melt of the Al reduction cell, respectively. The optimization design of the Al reduction cells should give full consideration to the influence of the ferromagnetic material
Authors: Francesco Gagliardi, I. Alfaro, Luigino Filice, E. Cueto
Abstract: The conventional tube extrusion process has been substituted by porthole die extrusion due to relevant advantages in terms of productivity and quality. However, the porthole die has a complex geometry to be effectively designed; consequently, several studies can be found out in the technical literature based on experimental and finite element analyses of the process. From this point of view, while the experimental investigations entail cost and time increasing, due to the die building complexity, finite element techniques present some drawbacks such as the difficulty to simulate material joining and the loss of accuracy due to the heavy mesh distortion and related remeshing. Therefore, the introduction of new numerical techniques for the analyses of this process could have positive effects. In this paper, the Natural Element Method (NEM) together to the alpha shapes and some extra numerical procedures are used in the simulation of tube extrusion, focusing the attention on the simulation of the welding line in a fully 3D analysis. The obtained results are compared with the finite element and experimental ones, measuring the accuracy of the proposed methodology.
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