Can an Xpress simulation be carried out with a chassis made of mechanical welding?

Simulation Resistance of materials
1

I tried on a part file with a mechanically welded structure that I combined to have only 1 element and the calculation failed at the mesh.

Do you have an idea?


calcul_chassis.docx
2

See in the mesh settings.
An engineering colleague explained to me that the smallest mesh size should be about 1/3 of the minimum thickness.

Be careful, it increases the mesh time...