How can I additionally model welds for the connection of two surfaces with a contact solid?

Answer

Since the boundary surfaces of contact solids can only be of the Null Surface type, it is necessary to model additional surfaces with a section. The following is an example for this.

There is a reinforcement of a plate with an additional plate. Both plates are connected by means of a contact solid:

Image 01 - Example Model with Reinforcing Plate and Contact Solid

Image 02 - Contact Solids Between Base Plate and Reinforcing Plate

In order to simulate a weld, borders are required on both plates:

Image 03 - Additional Border Around Reinforcing Plate and Base Plate

You can simply create the bottom border by inserting a new rectangular surface. In this case, the program asks whether the surface should be integrated into the base surface, which must be confirmed by clicking Yes. There are then two openings in the bottom surface; one in the outermost surface where lies the surface for the border, and another in the surface for the border where lies the bottom surface of the contact solid:

Image 04 - Bottom Border Created by Further Opening

For the upper border, it is also necessary to create a new surface, and the opening to the upper surface of the contact solid must be inserted manually:

Image 05 - Upper Border Created by Rectangular Surface with Opening

After creating the borders, you can insert the actual surfaces for the weld:

Image 06 - Connection Surfaces (Weld) Between Reinforcement and Base Plate

If the reinforcing plate is subjected to tension now, the modeled weld transfers the tension stresses:

Image 07 - Normal Forces in Weld Under Tensile Stress

Keywords

Contact solid Weld Stiffening Patch

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  • Updated 10 November 2020

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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