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Questions tagged [finite-element-method]

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How to derive Equivalent Static Load for irregular structure modeled with FEM?

Building codes such as the Uniform Building Code (UBC) or International Building Code (IBC) require the determination of Equivalent Static Lateral Forces in order to compute $P-\Delta$ effect and to ...
Graviton's user avatar
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Modeling the structure vs FEM

When you model the structure to be analyzed with a structural analysis program, indicating the beam elements, shell elements, nodes, rigid links etc... The analysis is still called Finite Element ...
upstream's user avatar
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Incompressible 2D pressure-driven flow: for Navier-Stokes equations in nondimensional form, how should I express pressure boundary conditions?

*I have updated this question. I'm using two codes for modeling incompressible, two-dimensional flow out of a tank. My fluid dynamics experience is pretty basic; I'm using the codes to understand a ...
Ant's user avatar
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8 votes
3 answers

How do I use FEM to derive the torsional constant of an arbitrary shape?

In this question I ask about how to perform a first-principle derivation of the torsional constant of a section. It appears that there is no such analytical derivation for torsional constant, so my ...
Graviton's user avatar
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7 votes
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Modeling Transient Heat Transfer between two 1-D materials

I have been working on creating a 1-D model of a material with a layer of heat resistant material stuck to it. For this I have been trying to use the implicit finite-differential method. The equations ...
chap178's user avatar
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5 votes
2 answers

What amplitude is used for a finite element modal analysis excitation?

In a typical finite elements analysis package, a modal analysis gives the N first natural modes, and it is possible to get the equivalent stress and total deformations for each of these frequencies. ...
Mister Mystère's user avatar
4 votes
1 answer

FEA: What boundary conditions am I missing?

I'm working on a 2D-model (in the xy-plane) in NASTRAN and am getting convergence problems. The main cause of these convergence problems is a "high or negative matrix factor diagonal ratio." I've ...
anonymouse's user avatar
3 votes
2 answers

Stiffness Method FEM - Slender Members

If a member is very slender then its length will be large compared to its cross-sectional area. I've heard and read that slender members can potentially cause the stiffness matrix of a beam/frame ...
pauloz1890's user avatar
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2 votes
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How to calculate residual strength of a corroded structure from their stress values?

Currently, I have an actual entire corroded bridge model in the FEM analysis in Abaqus I want to estimate the residual strength of this bridge due to corrosion from the output results in the Abaqus, I ...
Cindy.Karina9's user avatar
1 vote
1 answer

Rayleigh-Ritz method, calculating slope of beam?

For a simply supported beam with a UDL if the deflection is assumed to be: $$V=a+bx+cx^2+dx^3$$ What is the formula for calculating the slope? I thought it would be: $$θ=dV/dx$$ However, working ...
FEA42's user avatar
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1 vote
1 answer

What are the governing equations solved in FEA for structural mechanics?

In CFD we focus on the NS equations as the governing equations (together with other equations) and solved them using Some numerical method (usually FVM). What are the governing equations (counter ...
GRANZER's user avatar
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Solver cannot find any eigenvalues for linear buckling analysis [COMSOL]

I am trying to do a simple linear buckling analysis, where one end is fixed and the opposing end has a prescribed displacement of -0.1m in the x-direction that compresses the structure. Solver cant ...
Material scientist's user avatar
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How to obtain strain and stress values by editing abaqus input file?

I am currently working on abaqus modeling, I am trying to find a quick way to get the strain and stress values shown in the output file. What do I need to put in the .inp file? Does anyone know how ...
Cindy.Karina9's user avatar