Can I use symmetry in modal analysis in FEA

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SUMMARY

Symmetry can be effectively utilized in Finite Element Analysis (FEA) for models with symmetric geometry and boundary conditions. Users can save computational resources by modeling only a portion of the structure, as demonstrated in projects like spring mounts and injection molding simulations using MoldFlow. However, the applicability of symmetry depends on the specific characteristics of the CAD model, and users are encouraged to share their designs for tailored advice.

PREREQUISITES
  • Understanding of Finite Element Analysis (FEA) principles
  • Familiarity with CAD modeling techniques
  • Knowledge of MoldFlow software for injection molding simulations
  • Basic concepts of symmetry in engineering design
NEXT STEPS
  • Research the use of symmetry in FEA for various geometries
  • Explore MoldFlow software features for optimizing injection molding processes
  • Learn about preprocessing techniques in FEA
  • Investigate case studies involving spring mounts and their symmetry applications
USEFUL FOR

Engineers, FEA analysts, and CAD designers who are working on symmetric structures and looking to optimize their analysis processes.

Mohamed_Wael
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I am doing FE analysis for symmetric shape in boundary conditions and geometry, I would like to know if I can use symmetry in my analysis or not. I have tried to run trials, the results are very similar but I am not sure if this just a coincident
 
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Hi Mohamed_Wael,
depending on your model, you can make use of symmetry. You can read more about the preprocessing here.
If you for example take this project of a spring mount as an example, you'll find out that here they made use of symmetry.
This, however doesn't mean you can do it anytime.
Maybe describe your CAD model or post a picture of it to help us understand what you're trying to do and we can help you evaluate.
 
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In injection molding, we use a type of FEA software called MoldFlow that simulates plastic flowing in a mold. If the part is symmetrical, then we can use symmetry to save time. We also use symmetry with regards to the full shot vs. the number of cavities. So if I have four cavities on one runner, we model one cavity and a quarter of the runner.
 

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