Numerical models for rotor cage induction machines using finite element method

1998 ◽  
Vol 34 (5) ◽  
pp. 3202-3205 ◽  
Author(s):  
B. Boualem ◽  
F. Piriou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Models ◽  
Induction Machines ◽  
Rotor Cage ◽  
Element Method

Analysis of Composite Shrinkage Stresses on 3D Premolar Models with Different Cavity Design Using Finite Element Method

2013 ◽  
Vol 586 ◽  
pp. 202-205 ◽  
Author(s):  
Milos Milosevic ◽  
Nenad Mitrovic ◽  
Vesna Miletić ◽  
Uroš Tatic ◽  
Andrea Ezdenci
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Models ◽  
Experimental Testing ◽  
Fem Analysis ◽  
Local Stress ◽  
Model Verification ◽  
Polymerization Shrinkage ◽  
Displacement Analysis ◽  
Element Method

Local polymerization stress occurs due to polymerization shrinkage of resin based composites adhesively bonded to tooth tissues. Shrinkage causes local displacements of cavity walls, with possible occurrence of micro-cracks in the enamel, dentin and/or material itself. In order to design a cavity for experimental testing of polymerization shrinkage of dental composites using 3D optical analysis, in this paper finite element method (FEM) was used to analyze numerical models with different cavity radiuses. 3D optical strain and displacement analysis of composite materials and cavity walls is limited by equipment sensitivity i.e. 0.01% for strain and 1 micron for displacement. This paper presents the development of 3D computer premolar models with varying cavity radiuses, and local stress, strain and displacement analysis using FEM. Model verification was performed by comparing obtained results with data from the scientific literature. Using the FEM analysis of local strains, displacements and stresses exerted on cavity walls, it was concluded that the model with 1 mm radius was optimal for experimental optical 3D displacement analysis.

scholarly journals Fire resistance of composite non-load bearing light steel framing walls

2020 ◽  
Vol 38 (2) ◽  
pp. 136-155
Author(s):  
Seddik M Khetata ◽  
Paulo AG Piloto ◽  
Ana BR Gavilán
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fire Resistance ◽  
Numerical Models ◽  
Steel Frame ◽  
Small Scale ◽  
Load Bearing ◽  
Hybrid Finite Element Method ◽  
Hybrid Finite Element ◽  
Element Method

The light steel frame walls are mostly used for non-load bearing applications. The light steel framed walls are made with studs and tracks that require fire protection, normally achieved by single plasterboard, by composite protection layers or by insulation of the cavity. The partition walls are fire rated to resist by integrity and insulation. Seven small-scale specimens were tested to define the fire resistance of non-load bearing light steel frame walls made with different materials. All tests were validated using two-dimensional numerical models, based on the finite-element method, the finite-volume method and hybrid finite-element method. A good agreement was achieved between the numerical and the experimental results from fire tests. The fire resistance increases with the number of studs and also with the thickness of the protection layers. The hybrid finite-element method solution method looks to be the best approximation model to predict fire resistance.

scholarly journals Non-Smooth Behavior of Reinforced Concrete Beam Using Extended Finite Element Method

2019 ◽  
Vol 5 (10) ◽  
pp. 2247-2259
Author(s):  
Eman Abbas ◽  
Alaa H. Al-Zuhairi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Extended Finite Element Method ◽  
Concrete Beams ◽  
Numerical Models ◽  
Reinforced Concrete Beams ◽  
Scale Model ◽  
Extended Finite Element ◽  
Element Method

Flexure members such as reinforced concrete (RC) simply supported beams subjected to two-point loading were analyzed numerically. The Extended Finite Element Method (XFEM) was employed for the treatment the non-smooth h behaviour such as discontinuities and singularities. This method is a powerful technique used for the analysis of the fracture process and crack propagation in concrete. Concrete is a heterogeneous material that consists of coarse aggregate, cement mortar and air voids distributed in the cement paste. Numerical modeling of concrete comprises a two-scale model, using mesoscale and macroscale numerical models. The effectiveness and validity of the Meso-Scale Approach (MSA) in modeling of the reinforced concrete beams with minimum reinforcement was studied.  ABAQUS program was utilized for Finite Element (FE) modeling and analysis of the beams. On the other hand, mesoscale modeling of concrete constituents was executed with the aid of ABAQUS PYTHON language and programing using excel sheets. The concrete beams under flexure were experimentally investigated as well as by the numerical analysis. The comparison between experimental and numerical results showed that the mesoscale model gives a better indication for representing the concrete models in the numerical approach and a more appropriate result when compared with the experimental results.

scholarly journals Numerical simulation of fault development along NE-SW Himalayan profiles in Nepal

2004 ◽  
Vol 29 ◽  
Author(s):  
D. Chamlagain ◽  
D. Hayashi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Models ◽  
The Finite Element Method ◽  
Active Structures ◽  
Stress Orientation ◽  
State Of Stress ◽  
Tectonic Environment ◽  
Plate Kinematics ◽  
Element Method

We examined the state of stress in and around the Himalayan nappes via 2D finite element method using elastic rheology under plane strain condition. This paper describes how we used advanced numerical modelling technique, the finite element method to compute stress and fault as a function of rock layer properties, convergent displacement and boundary condition in the convergent tectonic environment. Interpretation of the calculated results remains somewhat ambiguous because of the limitation of elastic modelling, however, the results are still comparable with geological and geophysical data. Some interesting features of our models are: (1) compressive state of stress  in Himalaya; (2) effect of geometry of MHT on stress orientation; (3) the diffuse zone of failure elements along the flat-ramp-flat regions of the Main Himalayan Thrust (MHT); (4) normal and thrust faults pattern in the vicinity of Main Boundary Thrust (MBT) and Main Frontal Thrust (MFT); (5) initiation of faults at depth and their propagation toward south under increasing convergent dis placement,  which is consistent with the sequence of thrusting in Himalaya; and (6) direct correlation of simulated fault patterns with geological evidences. Thus overall features of the numerical models are able to conclude that the mid-crustal ramp, MBT and MFT are the most active structures in the present day plate kinematics.

The analysis of buckling and post buckling in the compressed composite columns

2017 ◽  
Vol 85 (1) ◽  
pp. 35-41 ◽  
Author(s):  
P. Wysmulski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eigenvalue Problem ◽  
Critical Load ◽  
Critical State ◽  
Numerical Models ◽  
Equilibrium Path ◽  
Critical Equilibrium ◽  
Thin Walled ◽  
Element Method

Purpose: The aim of the study was to analyse the work of a thin-walled C-shaped profile, made of a carbon-epoxy composite, which was subjected to unified axial compression. Design/methodology/approach: The scope of the study included the analysis of the critical and low post-critical state by the use of numerical and experimental methods. As a result of the experimental test, performed on the physical specimen, post-critical equilibrium path had been determined, on the basis of which, with use of the adequate approximation method critical load value was defined. The next stage of the research was devoted to numerical analysis based on the finite element method. The studies were carried out on a scope of the linear analysis of the eigenvalue problem, on the basis of witch the critical value of load for mathematical model was found. The next step of the numerical tests was covering the nonlinear analysis of the low post-critical state for the model with geometrical imperfection, corresponding to the lowest form of buckling. Findings: The result of the study was to determine the value of the critical load, on the basis of the experimentally obtained post-critical equilibrium paths of the structure, with use of two independent methods of Approximation: Koiter's method and the method of the vertical tangent. The results of the analysis were compared with the value of the critical load determined by using finite element method. Research limitations/implications: The obtained results of study provide the important information concerning the modelling techniques of the thin-walled structures made of composite materials, while confirming the adequacy of the numerical models developed both in the calculation of eigenvalue problem, as well as non-linear static analysis in the post-critical range. Originality/value: The research provided the necessary knowledge of the behaviour of the critical and low post-critical of the thin-walled structure made of modern orthotropic material (CFRP).

Finite Element Analysis of Contact Force Models During Solid Elastic and Plastic Bodies Impact

2018 ◽  
Author(s):  
Gustavo Simão Rodrigues ◽  
Hans Ingo Weber ◽  
Larissa Driemeier
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Contact Force ◽  
Numerical Models ◽  
Element Model ◽  
The Body ◽  
Element Analysis ◽  
Solid Bodies ◽  
The Impact ◽  
Element Method

There are many models of impact used to predict the post-impact conditions of a system and all of them are based on Hertz’s theory, dated from the nineteenth century, where the repulsive force is proportional to the deformation of the bodies under contact and may also be proportional to the rate of deformation. The objective of this work is to analyze the behavior of the bodies during impact using some contact models and compare the results to a Finite Element Method model. The main parameters which will be evaluated are the body velocities, the contact force and the deformation of the bodies. An advantage of using the Finite Element Method is the possibility to apply plastic deformation to the model according to material definition. In the present study, it will be used Johnson–Cook plasticity model where the parameters are obtained based on empirical tests of real materials. Thus, it is possible to compare the behavior of elastic and plastic numerical models with the finite element model and to verify how these models reproduce the impact between solid bodies.

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