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Hi Lokesh Katari


Rigid bodies are ideal representations of solid bodies or parts of fixed shape and size. They are highly useful in simulations where deformation of a part is negligible. A rigid body has 6 DOF, and each rigid body added to a system adds an additional 6 DOF.


Flexible bodies, or flex bodies, are used to model elastic deformation of bodies in a system. The flex body connects to its neighboring elements and bodies through interface nodes.

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flexible bodies are created with modal analysis of each component, so it will output natural frequencies (in .h3D and .out files).

If your query is about performing modal analysis on flexible body assembly, you may find useful:


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