# Finite Elements & ProE: Need Help!

• gimini75
In summary, the question is whether it is more accurate to use stiffness matrix and spreadsheets or ProE when doing FEM for a frame with 4 elements. The answer is that if the boundary conditions and material properties are the same, and the frame element in ProE has the same degrees of freedom as the stiffness matrix, both methods will provide accurate results. However, if the system is unstable, the answer may depend on how the instability is handled. Additionally, if the FEA software is up-to-date, it may provide slightly more accurate results than manual finite element calculations.
gimini75
Hello

I have a question if anyone know the answer I appreiatete it, the question is that when doing FEM for a frame in just 4 elements is more correct to solve it by using stiffness matrix and spread sheets or by using ProE is more correct answer can be found, please can you explain it for me if you can?

Thanks for your help

If the boundary conditions, properties of materials are the same, and if you are using the frame element in ProE having the same number of degrees of freedom as your stiffness matrix for the frame element, you should get the same answers as you should end up with the same global stiffness matrix.
If the system is unstable, that's a different story, because the answer(s) depend on how the instability is tackled.

gimini75: If the FEA software is not decrepit, then the FEA software will be very slightly more accurate than your own finite element calculations. But the difference will be so small that it will be negligible for most problems. Both methods will provide an accurate answer, and both methods are good.

## 1. What is Finite Element Analysis (FEA) and how is it used in ProE?

Finite Element Analysis (FEA) is a computational method used in engineering to determine the stresses and displacements of a structure under various loading conditions. In ProE, FEA is used to analyze and optimize the design of a part or assembly, ensuring that it can withstand the expected forces and stresses in real-world applications.

## 2. How does ProE handle finite element analysis compared to other CAD software?

ProE uses a proprietary finite element solver called Pro/MECHANICA to perform FEA on parts and assemblies. This solver is integrated directly into the ProE software, providing a seamless and efficient workflow for FEA. Other CAD software may use third-party solvers or require data to be exported to a separate FEA program.

## 3. Can ProE simulate different material properties in FEA?

Yes, ProE has the capability to simulate different material properties in FEA. The Pro/MECHANICA software includes a material library with a wide range of properties for various materials. Additionally, users can create custom material models to accurately represent the behavior of unique materials.

## 4. Is there a limit to the complexity of models that can be analyzed using FEA in ProE?

The complexity of models that can be analyzed using FEA in ProE depends on the computing power and memory available on the user's computer. Pro/MECHANICA has a robust parallel computing capability, allowing it to efficiently handle large and complex models. However, extremely large models may require more powerful hardware or the use of specialized FEA software.

## 5. Can FEA in ProE be used for dynamic analysis?

Yes, Pro/MECHANICA has the capability to perform dynamic analysis, including modal analysis, harmonic response analysis, and transient response analysis. These types of analyses are useful for understanding how a structure will behave under time-varying loads and vibrations.

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