Large-scale Finite Element Analysis Research Articles

A novel approach for efficient fatigue based shape optimisation of large scale finite element analysis models

This paper presents a novel approach for efficient fatigue based shape optimisation of large scale finite element analysis models using the engine block connection to the engine mount bracket as an example. It is not practical to perform a shape optimisation study for such problems using standard analysis and optimisation procedures owing to the complexity of the multi-body dynamics and finite element analysis models needed. The developed procedure was successfully employed to calculate the boundary conditions using nonlinear finite element analysis and to perform the fatigue based shape optimisation using the pre-defined shapes as design variables. The modelling and computational efforts of the proposed method are within the practical limits of the product development process. The developed methodology can also be applied to other vehicle components where shape optimisation study is not found feasible owing to the complexity of the interacting sub-systems.

Evaluation of loosening risks of the screws in spinal fusion based on large-scale finite element analyses of T1-S2 multi-segmental spine model

Evaluation of loosening risks of the screws in spinal fusion based on large-scale finite element analyses of T1-S2 multi-segmental spine model

A novel approach for efficient fatigue based shape optimisation of large scale finite element analysis models

This paper presents a novel approach for efficient fatigue based shape optimisation of large scale finite element analysis models using the engine block connection to the engine mount bracket as an example. It is not practical to perform a shape optimisation study for such problems using standard analysis and optimisation procedures owing to the complexity of the multi-body dynamics and finite element analysis models needed. The developed procedure was successfully employed to calculate the boundary conditions using nonlinear finite element analysis and to perform the fatigue based shape optimisation using the pre-defined shapes as design variables. The modelling and computational efforts of the proposed method are within the practical limits of the product development process. The developed methodology can also be applied to other vehicle components where shape optimisation study is not found feasible owing to the complexity of the interacting sub-systems.

Web-based integrated cloud CAE platform for large-scale finite element analysis

Web-based integrated cloud CAE platform for large-scale finite element analysis

Macroscopic modelling of flow-drill screw connections in thin-walled aluminium structures

This paper presents an investigation on the modelling of flow-drill screw connections in thin-walled aluminium plates in large-scale finite element analyses using different macroscopic modelling techniques. Five models that were originally developed for adhesive bonds, spot welds and self-piercing rivet connections were examined. Two sets of experimental data were used, each with a different screw and material combination. Different trends were observed for the two sets, which challenged the flexibility of the models. The results indicated that a constraint-based model originally developed for self-piercing rivet connections was the best suited model. A two-step validation strategy was proposed and used for the present models.

Ultra-large scale fracture mechanics analysis using a parallel finite element method with submodel technique

A software system for performing large-scale finite element fracture mechanics analyses is presented in this paper. The method is based on a submodel technique in which the large-scale finite element mesh is divided into two parts. One is the submodel which only represents the crack and its vicinity. The other is the global model for the whole structure. They are generated separately and connected. It is assumed that we use a supercomputer at a remote site and a PC/Workstation at a local site. The local PC/Workstation is used to perform pre/post-processings. The remote supercomputer is used to carry out the large-scale finite element analyses. In a crack propagation analysis, a number of remeshing steps are involved. We have developed a software system that the remeshings are performed only for the submodel. The global model stays the same during the analysis. Also, we minimize the amount of data which are transferred between the computers at the remote and the local site. In this paper, we present 100 million node finite element fracture mechanics analysis on a section model of nuclear pressure vessel, demonstrating the capabilities of present software system.

Some Progress on Parallel Modal and Vibration Analysis Using the JAUMIN Framework

In the development of large and complex equipment, a large-scale finite element analysis (FEA) with high efficiency is often strongly required. This paper provides some progress on parallel solution of large-scale modal and vibration FE problems. Some predominant algorithms for modal and vibration analysis are firstly reviewed and studied. Based on the newly developed JAUMIN framework, the corresponding procedures are developed and integrated to form a parallel modal and vibration solution system; the details of parallel implementation are given. Numerical experiments are carried out to evaluate the parallel scalability of our procedures, and the results show that the maximum solution scale attains ninety million degrees of freedom (DOFs) and the maximum parallel CPU processors attain 8192 with favorable computing efficiency.

Large Scale Finite Element Analysis Via Assembly-Free Deflated Conjugate Gradient

Large-scale finite element analysis (FEA) with millions of degrees of freedom (DOF) is becoming commonplace in solid mechanics. The primary computational bottleneck in such problems is the solution of large linear systems of equations. In this paper, we propose an assembly-free version of the deflated conjugate gradient (DCG) for solving such equations, where neither the stiffness matrix nor the deflation matrix is assembled. While assembly-free FEA is a well-known concept, the novelty pursued in this paper is the use of assembly-free deflation. The resulting implementation is particularly well suited for large-scale problems and can be easily ported to multicore central processing unit (CPU) and graphics-programmable unit (GPU) architectures. For demonstration, we show that one can solve a 50 × 106 degree of freedom system on a single GPU card, equipped with 3 GB of memory. The second contribution is an extension of the “rigid-body agglomeration” concept used in DCG to a “curvature-sensitive agglomeration.” The latter exploits classic plate and beam theories for efficient deflation of highly ill-conditioned problems arising from thin structures.

Research of the Key Control Parameters Standard for Shield Tunnel Under-Crossing High Speed Railway

This paper takes a new shield tunnel as the research object, which intends to cross a section of a high speed railway. Based on design specifications and the existing monitoring data to analyze the change rule of track irregularities, this article proposes the control of wavelength and relevant amplitude in the above case, following the design specifications and long-wave irregularity management demands of high-speed highway. And the controlling values of wavelength and amplitude required are presented with the outcome of the range of the settlement trough, drawn out of the under-crossing process. And it also uses large-scale non-linear finite element analysis software to simulate the high speed railway track deformation in actual constructions, to test whether the deformation meet the requirements of the control standards and deformation law. The results can provide reference for the construction measure when shield tunnel under crosses the high speed railway in the future.

Seismic Response Analysis of Prestressed Concrete Bridge

Using large-scale finite element analysis software ANSYS analyzes seismic respons of prestressed concrete bridge, respectively establish finite element model under viscoelastic boundary conditions and elastic boundary conditions, compare and analyze seismic respons of bridge structure under two kinds of boundary conditions. Compared with elastic boundary conditions, viscoelastic boundary conditions not only can simulate elastic recovery performance of foundation, but also can realize infinite medium radiation damping. The research results provide the basis for the seismic design and protection of bridge.

One Kind of Mould's Geometrical Modeling and Finite Element Analysis

This paper, by using large-scale finite element analysis software Ansys and assuming that the lining of a mould is under uniformly distributed load, analyses the stress and deformation and on the basis of the result gives an overall optimization design.

Finite Element Analysis of Temperature Filed and Stress Field of Reducer

Abstract.The connection mode of reducer with straight tube on both sides are the welding connection. There are two weld at the both side of reducer and there has a great influence on residual stress and deformation in the process of welding . Based on the particularity of reducer welding, the paper is focus on the residual stress and deformation in the process of welding, using large-scale finite element analysis software ANSYS .The DN500X450 reducer model is established.The welding temperature field and residual stress field is analysis and calculation and analysis the influence on temperature and stress distribution of reducer. The results show that the maximum of the temperature and the residual stress is located in the big side and reduce the welding seam, and the obvious deformation also find in the big side and reduce joint . The reducing pipe’s distribution of temperature field and residual stress field are obtained,providing the basis to establish properly and optimize of welding process.

Stress Distribution Form and Function Representation of Four Free Edges Square Basal Bottom Slab Touching Foundation

This article constructed the stress distributions function expression of four free edges square basal bottom slab touching foundation respectively from the two aspects of symmetric and anti-symmetric load, placed the foundation on the surface of the sandy soil, do numerical simulation to the contact stress between foundation slab and foundation through the large scale finite element analysis software ANSYS, and fitting by adopting the contact stress function proposed in this article. The contact stress function and finite element numerical fitting result shows that the contact stress function proposed in this article can better reflect the actual contact stress distribution, also adapt to foundation slab with different width height ratio.

Discussion of the Stress State after Strengthening and Extending of a Hospital in Shanxi

At present, there exist more and more adding storey building in China, the research on the reconstruction project is also increasing. There are no corresponding technical specifications to constraint the concrete that add steel structure to the concrete structure, this is a blank area. A hospital floor in Shanxi is on the basis of the original eight-story reinforced concrete shear wall, using steel reinforced concrete to transition, adding five-story steel frame-buckling support structure. Using the large-scale finite element analysis software ANSYS, this paper analyzes the increasing cross-section method of reinforced concrete column to obtain the stress-strain situation of the old and the new combination surface and the stress-strain before and after the column reinforcement, proposes design measures to resist the shear on the old and the new combination surface working together to reduce the stress-strain hysteresis effect. The results provide a reference for similar project.

Bearing Capacity Analysis of the Cross-Section Steel Reinforced Concrete Column in Different Parameters

This paper uses the large-scale finite element analysis software ABAQUS to simulate 12 cross steel reinforced concrete special-shaped columns with the control variables of axial compression ratio and rate of steel bone, and subjected to the monotonic load with 20mm horizontal displacement. 6 columns work under the different axial compression ratio of 0.0, 0.4, 0.5, 0.6, 0.7 and 0.8. Other 6 columns are made of different rates of steel bone with different steel bone thickness of 0mm, 2mm, 4mm and 6mm, 8mm and 10mm, and subject to vertical axial force in axial compression ratio of 0.3. By simulating, we obtain the load - displacement curve of different axial compression ratios and different rates of steel bone, and analyze the effect of the bearing capacity of the cross steel reinforced concrete special-shaped columns in different parameters. The results show that the bearing capacities of the columns decrease with the increasing ratio of axial compression, and increase with the increasing rate of steel bone.

Large-scale finite element analysis of a 3D angle-interlock woven composite undergoing low-cyclic three-point bending fatigue

This paper reports the large-scale finite element analysis (FEA) of a 3D angle-interlock layer-to-layer woven composite material undergoing low-cyclic three-point bending fatigue at microstructure level. A microstructure geometrical model of the 3D woven composite material was established to model the real structure of the woven composite. The fatigue behaviors of the 3D woven composite undergoing three-point bending with sinusoidal wave-form were investigated from experimental and FEA approaches. Based on displacement-controlled bending and inelastic hysteresis energy fatigue damage criterion, the interior deformation, energy absorption, and stress distribution characteristics during the fatigue process were analyzed. The different failure mechanisms and damage patterns of yarns and resin were discussed. The influence of the 3D woven structure on the fatigue behaviors was discussed. The fatigue damage morphologies and stiffness degradation were obtained to compare with the experimental results. The results show that the most of energy was absorbed by warp yarns. Stress concentration was emerged on the inclined part of warp yarns and the interface between yarns and resin. The damage morphologies from experimental and FEA results are in good agreement. The stiffness degradation curves also show the same tendency.

Mathematical Simulation the Influence of Tundish with a Retaining Wall

Placement in the middle retaining wall package, aimed at controlling the flow of liquid steel forms, so that movement of a reasonable level remained stable, while reducing interference from turbulence and dead zones, molten steel in order to extend the average stay of removal in favor of inclusion to improve the cleanliness of molten steel.In this paper, with the tundish wall flow field of research is the use of mathematical simulation methods, three dimensional mathematical models are currently being used successfully to simulate liquid steel flow and temperature distribution, the large-scale universal Finite Element analyses software ANSYS CFX is used and many models based on different tundishes are built

Beam Frame Supported Shear Wall Structure Based on the ANSYS Finite Element Static Analysis of Beam-Type Transfer Floor

This article research frame supported shear wall structure Beam-type Transfer layer at the supporting wall (across full) shape and the supporting column two structure forms, in the same form of vertical uniformly distributed load, the stress distribution variation trend and characteristics of the analyzed and discussed. Using large-scale finite element analysis software ANSYS to two different Beam-type Transfer structure of the nonlinear simulation analysis, combined with the stress nephogram of X to the analysis of two kinds of structure forms of the transfer beam and upper wall and the frame work characteristics [. The results of the study show that: In terms of the vertical stress, wall shape across the full shear wall in the stress of the beam structure performance is better, Column will produce large stress in the beam. Shear wall and stress of the transfer beam work together to transform beam has a great influence.

Study on Ductility Performance of T-Shaped Section Steel Reinforced Concrete Columns

This paper, the mechanics characteristic of T-shaped section steel reinforced concrete column under low period repeated loading by using large-scale finite element analysis software ABAQUS was analyzed, combined existing research, the influence of the performance of ductility under different steel ratio and axial compression ratio was studied, we concluded that the T-shaped section steel reinforced concrete column has the very good ductility performance, and put forward the axial compressive ratio limit under the different parameters, and to provide the reference for future research and application.

Finite Element Analysis on Large-Scale Electrical Dust Precipitator Steel Structures

Based on the construction features of the steel structures of a type of electrical dust precipitator, a finite element model is established with large-scale finite element analysis software ANSYS, and the structure stress and displacement of the model under all sorts of loads are analyzed with the frontal solution method. The results indicate that analysis is relatively accurate, the finite element model and the analysis method is appropriate. The result can be further used for optimization design of the electrical precipitator steel structures.