# Tag Info

### What is the difference between FEA and CFD?

CFD (computational fluid dynamics) includes any numerical method used to solve fluid flow problems. FEA (finite element analysis) is one numerical method for solving partial differential equations, ...

### Does welding two metal parts together increases or decreases the strength locally there?

Regarding the problem you have, without reviewing the results its difficult to make a definitive answer. However, if you are observing high loads near the weld, I think you should try to make ...

### Does welding two metal parts together increases or decreases the strength locally there?

Yes, it increases and decreases strength in traditionally steels. Depends on what steel you have and what you mean by "thin rods", and the weld process , and the specific weld parameters. ...
Accepted

### FEA: What boundary conditions am I missing?

After a long discussion with the OP in comments and chat, it emerged that the basic cause of the problem is the geometry of the structure. The curved "beam" has a length/diameter ratio of about 50,000:...
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### Rayleigh damping in Finite Element Models using beta-coefficient only

The report in your link explains it briefly in the sentence after your quote. The beta term models "structural" or "hysteretic" damping, which is described earlier in the report. The key fact about ...
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### How to model elastic support in FEM?

Before jumping into elastic support conditions, you have to realise that it's not a ground beam. For three reasons: With a minor axis width to depth ratio of 6ish, it's not far away from a square. ...

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

This is a problem which is usually solved in books on elasticity theory. The underlying math is based on the solution to the Laplace PDE. If you do a Google search for Larry J. Segerlind's book "...
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### ANSYS Workbench/Mechanical: Automatically export chart?

There are several options for doing this: If there are only a few values to be saved per design point, you could use 'output parameters'. If there is a lot of data to be saved, the report generator ...
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### How can I reduce the computation time required to simulate a brain tissue penetration model?

Given the subject matter my gut tells me to take the time to compute once you've triple checked your conditions. What material properties are you using? You can alter the mesh to decrease cpu usage as ...

From a theoretical standpoint, the displacement gradient is equivalent to strain (assuming a structural problem). Numerically, you can obtain the derivate of a quantity through multiplication with ...
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### Are there other finite element types besides the usual?

Certain geometries can benefit from polyhedral elements or elements with edge degrees of freedom. I can think of three main developments in that direction: 1) Voronoi cell finite elements, e.g., ...
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### How to properly validate transverse isotropic elasticity Finite Element Code

Definitions Before we can answer your question, let us look at two standard definitions of terms (from ASME Guide for Verification and Validation in Computational Solid Mechanics) : 1) Verification:...

### Viscoelasticity and Hyperelastic model, history and difference

Let's look at some (very rough) definitions: 1) Viscoelasticity = elastic behavior that changes if the rate of application of the load is changed or, if the load is kept fixed, the change in the ...
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### Viscoelasticity and Hyperelastic model, history and difference

The hyperelastic and viscoelastic material models are both constitutive relations that relate: Stress and strain, in the case of hyperelasticity. Stress, strain and strain rate, in the case of ...
The balance of linear momentum is $$\nabla \cdot \boldsymbol{\sigma} + \rho \mathbf{b} = \rho \mathbf{a}$$ where $\boldsymbol{\sigma}$ is the Cauchy stress, $\rho$ is the mass density, $\mathbf{b}$...