Answer:
The easiest way, of course, would be to insert an opening for the area that should be reinforced, and to include this opening in a thicker surface again (surface thickness + reinforcement thickness). To do this, proceed as follows:
- First, create all boundary lines (Image 01).
- Create the first surface with external boundary lines, if this does not already exist (Image 02).
- Create an opening where the inner surface will be located later (Image 03).
- Create the inner surface (Image 04).
- If necessary, create further openings within the inner surface (Image 05).
However, this modeling does not consider the contact between the surface and the reinforcement (possible failure at tension). A consideration closer to reality would be, for example, using contact solids, but this modeling would be more time-consuming, depending on the model. However, this provides more accurate results. For this, you can find a link to the article about modeling contact solids below.