You can create new faces by automatically stitching any gaps between free edges. Stitching gaps allows you to replace small faces, fillets, or chamfers that you previously deleted. The operation to stitch gaps is stored as a feature of the part; therefore, you can use the Model Tree to delete the stitch and revert to the original part. For more information, see “What is stitching?,” Section 69.3.
You can stitch gaps in either manifold parts (parts in which every edge is shared by only one or two faces) or non-manifold parts.
To stitch edges:
From the main menu bar, select Tools
Geometry Edit.
Abaqus/CAE displays the Geometry Edit dialog box.
Tip:
You can also stitch edges using the 
tool, located with the edit tools in the Part module toolbox. For a diagram of the edit tools in the toolbox, see “Using the Geometry Edit toolset,” Section 69.1.
From the dialog box, select the Edge category and the Stitch method.
From the warning dialog box that appears, click OK.
If desired, specify a stitch tolerance from the prompt area for the stitching operation. Abaqus/CAE will stitch only gaps smaller than the tolerance value that you specify.
Do one of the following:
If you want to select the edges for the stitching operation individually, toggle on Pick edges, click mouse button 2, then specify the edges you want to select. All the edges you select must be free edges because when Abaqus/CAE attempts only manifold stitching when Pick edges is selected. The stitching operation fails if you select any edges that are shared by more than one face.
Tip: You can select edges individually, specify an existing set that includes edges, or select edges using the angle method. For more information about selecting geometry in the viewport, see “Selecting objects within the current viewport,” Section 6.2.
If you want to stitch edges throughout the entire model, toggle off Pick edges and click mouse button 2. When Pick edges is toggled off, Abaqus/CAE can attempts both manifold and non-manifold stitching on the whole model. If any of the edges of the model are shared by more than one face, the resultant model will be non-manifold.
If you have editing the part, you should check its validity by clicking mouse button 3 on the part in the Model Tree and selecting Update validity from the menu that appears.
