Papers by Keyword: Finite Element Model (FEM)

Abstract: This subgrade is a large number of backfill soil and gravel pile foundation. The building produce settlement because of bearing capacity of foundation soil is poor. The rapid settlement of the building has been stopped using grouting techniques but the effect may not be quick; For the purpose of settlement resistance and deviation rectification, it is better to use a comprehensive treatment methods which combine the hollow grouting anchor static pressure pile, heaping load and drawing out soil with watering. It acquire a good effect of settlement resistance and deviation rectification. By establishing finite element model of the frame structure of the building using software of ANSYS, the housing stress and deformation in the process of rectification can be simulated and compare with the data of field. It can confrim a dependable construction schedule and insure the housing stress and deformation is in the range of safety.

Abstract: Models of groundwater flow are widely used for a variety of purposes ranging from water supply studies to designing contaminant cleanup. In general, groundwater flow system can be divided into steady-state and transient. In the present work, we investigate the usefulness of finite element method in modelling of steady-state subsurface fluid flow and transient solute transport along a vertical cross section in an unconfined aquifer. Details are explained on numerical approximations leading to different numerical results. Extensions for pollutant transport are mentioned.

Abstract: This paper first describes a variety of heat transfer which exists in cable’s discharge pipe laying process, and analyzes the entire heat transfer process of 10kV three core cable in a two-dimensional interface qualitatively according to the heat transfer ways. Meanwhile, a finite element model of 10kV three-core cable’s discharged pipe-laying is established, and its temperature field equations and boundary condition equations has been discussed. Finally, we get the heat transfer process of the three core cable’s pipe-laying discharged and a finite element model which can be applied to simulated calculation.

Abstract: This paper investigated the ultrasonic mechanism of Time of Flight Diffraction (TOFD) by finite element analysis for the better applications of ultrasonic TOFD (Time of Flight Diffraction) detection technology. The welding steel plate with the artificial defects is used in the finite element analysis model. The experimental A-scan signal with higher noise is filtered by the wavelet transform, which can clearly show defective diffracted wave. The software simulation of ultrasound is used to present the propagation process of ultrasonic signal inside the sample. Simulation results are compared with the experimental results, which shows valid basis for the practical TOFD ultrasonic detection methods in industrial applications.

Abstract: Rubber played a buffer role in prosthetic knee motion. Rubber bearing is a very complicated process, and rubber material itself is nonlinear. ABAQUS software can able to deal with highly nonlinear problems. Input rubber test data in ABAQUS, selection of constitutive model, and then the finite element model is established, which is calculated, finally obtains compression under different loads.

Abstract: According to the spinal anatomy data, three-dimensional geometric model of human lumbar spine L3-L5 segment is established in this paper. In the model, the vertebra is divided into cortical bone, cancellous bone, endplate and other structures. The connection between the vertebrae and intervertebral disc is simulated as contact joint. The material properties of lumbar parts of the structure are not the same, the elastic modulus is changing in the analysis. Based on the model, the deformation of the lumbar spine under different size of axial force and lateral torque is simulated. The simulation result shows the variation regularity of the deformation of vertebrae and intervertebral disc under the condition of different pressure. This research provides a quantitative reference for spinal bio-mechanics. The human spine model with a gradient change sets the foundation for processing field of artificial joint using the 3D printing technology.

Abstract: The selection of the optimum expansion joint depends on a technical as well as an economical aspect. The bellows is the basic element of expansion joints. The aim of this research is to perform a Finite Element Analysis (FEA) of metal bellows to investigate its static behavior and validate it with Expansion Joints Manufacturing Association (EJMA) standard. Further a parametric study is used to investigate the meridional stress component on the metal bellows at various temperatures. The result explains that the dimensions of convolution curvature are sensitive to its mechanical behavior. Also the component becomes flexible and peak stresses are reduced at elevated temperature.

Abstract: The deflection and natural frequency of a 3 – Dimensional Timoshenko Beam (TB) is analyzed using Finite Element (FE) method. Significant improvement in computational time can be obtained when new shape functions are used. The results obtained from existing software packages and the new FE model are compared and good improvement is observed.

Abstract: With the help of the commercial FE package ANSYS, this paper presents a finite element (FE) model for analyzing coupled flutter of long-span bridges. This model models the aero-elastic forces acting on the bridge utilizing a specific user-defined element Matrix27 in ANSYS, by which stiffness and damping matrices can be expressed in terms of the reduced wind velocity and flutter derivatives. Taking advantage of this FE model, Transient dynamic analysis is carried out to determine the dynamic response of a structure under the action of pulse load, of which the damping ratio can be obtained by considering response peaks which are several cycles apart. The condition for onset of flutter instability turns into that, at a certain wind velocity, the structural system incorporating fictitious Matrix27 elements does simple harmonic vibration with zero damping ratios or near zero one. The damping ratio is completely calculated in post-analysis of ANSYS and the initial frequency is given by any value and the last frequency can be got by iterating several times. In order to validate the developed procedure, a classical case study on three hundred meter simple supported beam is provided.

Abstract: With accelerating urbanization construction, especially with the scale enlargement of high-rise buildings, the crane’s hoist boom length and height is increasing.The hoist boom will produce strength and buckling failure easily on the working condition of complex combination, such as gravity, wind load and inertia force.The TC6010 crane was analyzed the mechanics by finite element method. This thesis got its stability and strength data in four kinds of working conditions. It can provide certain reference value for other crane’s design and calculation.