Which feature is used to strengthen folds in sheet metal designs in Autodesk Inventor?

The Bend feature is specifically designed for creating and manipulating folds in sheet metal designs within Autodesk Inventor. It allows users to define the angle and radius of the bend, ensuring that the sheet metal part maintains its desired shape while maximizing strength at the fold. This capability is crucial in sheet metal design, as folds can be critical for both the structural integrity and the functionality of the final product.

Additionally, the Bend feature directly integrates with other sheet metal functionalities in Inventor, such as K-Factor calculations, which helps in determining the material's elongation during bending. This results in a more accurate representation of how the metal will behave in real-life scenarios. The fact that it is tailored specifically to sheet metal applications makes it the preferred choice for optimizing the strength of folds.

The other features, while useful in their contexts, do not provide the specialized capabilities required for sheet metal bends. For instance, the Fillet feature is primarily used for rounding edges or corners, the Revolve feature creates revolved shapes around an axis, and the Extrude feature is utilized for extending a 2D shape into a 3D form, none of which specifically address the strengthening of folds in sheet metal.