Papers by Keyword: FE Method

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Authors: Ze Min Liu, Zheng Hua Guo, Gang Yao Zhao, Shu Zhang, Ji Luan Pan
Abstract: A 3D finite-elements model of 45# carbon steel of linear friction welding is built with the dynamic explicit code ABAQUS/explicit based on the solution of several key techniques, such as contact boundary condition treating, material properties definition, meshing technology, etc. Then the reliability of the model is validated by comparison with experiments in the literature. Furthermore, numerical simulation and analysis of the linear friction welding process of 45# steel have been carried out by using the model. The temperature field of workpiece, the temperature change of center point of welding interface and the metal flow behavior of welding interface are showed in results.
701
Authors: Jia Rui Wang, Ping Fa Feng, Zhi Jun Wu, Ding Wen Yu, Jian Fu Zhang
Abstract: Finite element simulation is an effective method to study the thermal characteristics of high-speed motorized spindle, how to improve the simulation accuracy has become the key point of this research field. This paper presents a FEA method using ANSYS to precisely predict the thermal characteristics of high-speed spindle. Firstly, the heating and cooling characteristics of high-speed spindle are analyzed, main heating source, convective heat transfer coefficient, and thermal contact resistance are calculated. Secondly, FEA model of the machine center is built, the temperature field and thermal deformation of the spindle system are simulated. Thirdly, an experimental system to test thermal characteristics is designed, simulation results are compared with the experimental results. The result shows that the simulation errors are controlled in a relative low range, the FE modelling method can precisely predict the thermal characteristics of the motorized spindle.
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Authors: Muhammad Zubair Muis Alie, Y.R. Palentek, D.G. Sesa
Abstract: One of the most important criterion in the design of fixed offshore platform is to have strength from applied loads which is acting perpendicular to jacket leg section such as axial compression.The axial compressive load acts vertically downward to jacket legs and the deformation on the jacket legs in horizontal direction due to this load is called buckling. In the present study, buckling analysis on pechiko field of fixed offshore platform is performed using Finite Element Analysis (FEA). The fixed jacket platform namely tripod and tetrapod are taken as the object of the analysis. Only the axial compressive load is used in the analysis and the boundary conditions are assumed to be fixed both tripod and tetrapod at the bottom seabed. As a fundamental case, buckling analysis is carried out in plane-section (2D analysis), then the result obtained by FE analysis is compared with the analytical solution.It is found that the result obtained by FE analysis for the critical buckling load is in good agreement with the analytical solution, and the applicability of FE analysis is further used to investigate the deformation of 3D model.
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Authors: Hui Yu, Xin Liang Zang, Li Gang Liu
Abstract: In this paper, the thermal fatigue damage phenomenon in the comprehensive temperature environment is studied by means of thermal fatigue damage mechanics and FEM technology, the thermal-stress analysis modal under the comprehensive thermodynamic boundary conditions is established, the regularities of distribution of temperature fields, thermal stress fields effected by the comprehensive coupled variables are investigated. According to the modify of material characteristics under the high-temperature alternating thermal impact conditions and the integrated influences of environment, mechanical parameter and material microstructure to the fatigue fracture, numerical modal of thermal fatigue crack initiation and propagation are developed, so the characteristics of thermal fatigue crack propagation are studied, which are verified by the experiments, it is very significant to study thermal damage question of working equipments in the similar conditions.
2287
Authors: Jeong Hoon Lee, Jong Myeong Lee, Jeong Min Ha, Dong Sik Gu, Byeong Keun Choi
Abstract: The demand and importance of vacuum pumps are increasing, because the necessity of dry vacuum pump is proven in semiconductor industry. Various types of vacuum pumps have been developed, and in this research a roots type vacuum pump has been analyzed with a variety of mathematical analysis. Analysis of eigenvalue by FEM analysis and Modal Test were performed through the Roots type vacuum pump and using the results of irregular vibration and instability an assessment has been performed.
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Authors: Ming Zhang, Nian Peng
Abstract: The treatment of soft soil foundation is a common but hot and difficult problem in the construction projects. Based on the reinforced treatment of abutment foundation in Fuyan Bridge and the hypothesized different treatment measures, settlement deformation of abutment foundation was calculated and analyzed by means of software ANSYS; variations of synthetic modulus for foundation soil and curves of settlement deformation of abutment foundation were obtained, which offers references to the design and construction of such projects.
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Authors: Ming Tu Ma, Jing Wen Zhang, Jun Ping Zhang
Abstract: Bulletproof steel plates are widely used for the safety of special vehicles. This paper mainly researches on bullet penetration resistance of heat treated lightweight C-grade bulletproof steel plates through numerical analysis. Based on the flow behavior of bulletproof steel plates and bullet at various high strain rates, finite element (FE) model has been set up in the ANSYS/LS-DYNA software. The simulation results are compared with the shooting results, which show a good consistency and a high reliability. Therefore, the simulation results are efficient approaches and methods to decide and select mechanical property and thickness of bulletproof steel plates. It can save a lot of works and costs of experiments.
257
Authors: Hichem Salah, M.M. Bouziane, S.M. Fekih, Bel Abbès Bachir Bouiadjra, S. Benbarek
Abstract: Infections total hip arthroplasty (THA) are common and can lead to serious complications for patients. Newly developed antibiotic spacers successfully eradicated infection in more than 90 percent of patients. However, the low mechanical strength of the orthopedic cement can be a serious handicap for the success of the surgical operation. The reinforcement of cement spacers with high strength materials can improve the efficiency of this type of surgery. In this study, the three-dimensional finite element method (FEM) is coupled with the experimental design method (EDM) to optimize the geometrical and mechanical properties of the reinforcement that can be applied to cements spacers. The obtained results show that the full stem reinforcement in bio-ceramic with a thickness of 8.2 mm can represent the optimal model to ensure good mechanical resistance of the cement spacer.
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Authors: Ru Xiong Li, Song Hua Jiao
Abstract: According to the characters, technological condition and requirements of automotive front axle forging, the advantage of the roll forging and integral die forging complex process for automobile front axle were explained, including the determination of roll- forging parts chart, selection of billet dimension, decision of roll- forging steps, special roller- shaped design of typical section, and the front sliding parameter is calculated, its effect to length of forging parts gets analyzed. In this paper, taking NHR front axle as an instance, both the process of exact roll- forging billet and die design are studied, as the result, roll- forging die、 performing roll- forging die and final roll-forging die are design respectively. The process for roll forging was simulated by the three dimensional finite element analyses under isothermal condition, and metal flow procedure and force time curve were obtained. The connection among metal flow law and die cavity design and forming load were also analyzed. To verify the reliability of the simulation, the results for profile was compared with the tested forging part, showing that metal flow law of both are coincident and FE simulation of roll forging is accurate. Practice testify that FE simulation of roll forging for front axle can reduce the time of process design and procedure debugging and be helpful to response the market demand.
2845
Authors: Attila Szilágyi, György Takács, Balázs Barna
Abstract: This article is a brief summary of an R&D project work that includes the improvement of a roll-bending machine with high power. The emphasis was laid on achieving an increased static stiffness of the equipment. In the followings the numerical calculations and the simulations are presented.
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