Papers by Keyword: Finite Element (FE) Simulation

Abstract: Ultrasonic deicing is a new method of deicing. This paper analyzed and designed a kind of ultrasonic deicing acoustic system, then simulated it with the ANSYS, which is a kind of finite element simulation computer software used to do finite element simulation work. The results indicate that the frequency and mechanical properties of the acoustic system meet the expectant demand.

Abstract: The welding quality of the steel structure is one of the most important segments in the whole construction project, especially in the condition of special geographical environment and wicked climate. In this article, by means of the mechanical test and finite element simulation analysis, a welding treating technology has been summarized in the subzero surrounding, which is based on the fundamental of component size selecting, preheat, heat preservation, and change of the ambient temperature including the rising material temperature before welding. Therefore the thermal crack and cold crack can been effectively eliminated. Rigorous controlling the temperature of the welding procedure and scientific construction play an important role to ensure the welding quality of the big span truss beam and column.

Abstract: Based on the theory of breakage mechanics,the structural loess are conceptualized as binary －medium model consisting of bonding brick and frictional band. Shear band is structural loess’ breakage, localization band sprout and development is dynamic process that bonding brick is translating into frictional band.Application of double parameter breakage ratio binary-medium mode of structural loess,simulated the process of structural loess localization band sprouting and expanding with the numerical simulations method,studied localization shear band shape、speciality and law under different disfigurement project,found that the strain localization on a shear band of structural soil at originally is some sets discontinuous little local breakage area step by step developed、 connected and formed the shape of whole destruct with the external load increased,appeared dilatation softening phenomena under the especial disfigurement. Combining binary-medium mode with general finite element,solved the question of localization shear band softening,visual reappeared the course of the local shear band germination and progress.

Abstract: The dynamic electromagnetic compression technique of metal tube which can be used for study of collapse with cylindrical symmetry like the thick-walled cylinder (TWC) technique is introduced. 3D simulations by multiphysics ANSYS finite element code are used for metal tube compression, and the magnetic flux density, displacement, and strain in process are obtained. The influence of the sizes of the tube is considered in the tube compression. The finite element analysis results show that the specimen which has small height or thinner thickness is easier to compress than the big one. The study can offer valuable information about the process analysis of metal tube electromagnetic compression and specimen design.

Abstract: In the multiple-circuit on same tower UHV and large crossing transmission tower,The main material of towers usually using a composite section in the form of the dual-angle and four steel angle. Dual-angle and four steel angle connections are inevitable. 500KV Jianbi - Danfeng four circuit transmission line project for the background, Using the finite element software ANSYS10.0, Composite Joints three-dimensional nonlinear finite element simulation. Clear the path of force transferor the node, Mechanical behavior of gusset plate and node failure modes. The results show that: node failure modes for the strength failure, The ultimate bearing capacity of the node is about three times the load of the node design, Node design is relatively conservative, By reducing the thickness of the gusset plate to lower node weight.

Abstract: This paper deals with problems in the coining process for manufacturing surgical slit knife using two-dimensional (2D) and three-dimensional (3D) finite element (FE) simulations. The FE simulations are performed to investigate the material flow, and especially stress distribution on the coining dies. The main objective of this paper is to study the feasibility of a coining process for manufacturing a given geometry of surgical slit knife without forming defects and die failure. Very high stress distribution on the coining dies is found by 2D simulations of the coining process that exceeds the strength limit of the die material. The optimum preform and preforming die geometry are determined by FE simulations in order to reduce the die stress. 3D simulations of the preforming and coining processes are conducted with the optimal design to show that the geometry of the product can be achieved without defects by the coining process.

Abstract: There are lots of titanium alloy parts which have large-scale micro-structures in astronautic structure and medical implants, so the micro milling becomes one of the effective processing methods in getting the surface micro-structure. Because the titanium alloy has high caking property in processing, it needs a research on the cutting heat and force in order to get better machining precision and surface quality. According to the finite element theory in elastic and plasticity, the influence of cutting speed to the cutting heat and force is got by finite element simulation analysis to the titanium material TC4 in cutting process. It can get the simulation results of cutting heat and force in the micro milling processing by finite element analysis, and then compared, the basic influence which the cutting speed to the cutting heat and force is got. The correctness of the result is checked through cutting experiments.

Abstract: A finite element simulation study of cutting process and whole part deformation of a large thin-wall aluminum alloy part used in aerospace is carried out by ABAQUS. The geometry model, material model and heat conduction model are built. The friction conditions and boundary constraints are determined. The whole process of chip generation is simulated and the distribution of strain, stress, cutting temperature and are given. The chip formation and the cutting force are also predicted. Based on the prediction results, the deformation of whole part is predicted. This study establishes the foundation of selection and optimization of cutting parameters and deformation compensation for this kind of large thin-wall parts.

Abstract: A numerical study is performed to investigate the stress concentration phenomenon in a piled embankment during high-speed train passage. In the numerical simulation, the loading of a moving train is first represented in the model as a series of time-varying equivalent concentrated forces vertically acting on the ballast surface, and the explicit finite element method (FEM) is then used to analyze the ballast-embankment-ground system subjected to the equivalent forces. The study shows that owing to the very high stiffness of the piles relative to the soft soil, a majority of the wave energy, which is generated by the passage of wheel axles, is concentrated to the improving piles and transferred down to the stiff soil stratum. By this stress concentration phenomenon, the soft soil surrounding the piles is subjected to less stress, and thus preventing undesirable dynamic effects that could be induced in the soft soil.

Abstract: Ring parts with small-hole and deep groove such as duplicate gear and double-side flange, are widely used in various engineering machineries. Three-roll cross rolling (TRCR) is a new advanced plastic forming technology for the processing of rings with small-hole and deep groove. In this paper, a 3D coupled thermo-mechanical FE model for TRCR of ring with small-hole and deep groove is established under ABAQUS software environment. By simulation and analysis, the evolution and distribution laws of strain and temperature in the forming process are revealed, and the effects of the key process parameters on the deformation uniformity are explored. The results provide valuable guideline for the technological parameter design and optimization.