prerr calculation (2 materials)

[pierino7117]

goodwill to all, the calculation of the prerr (percent error), in a finite element model characterized by 2 different materials, should be calculated separately for the two materials or is calculated on the whole model regardless of the elastic properties of the materials? Moreover, if it is to be calculated on the whole model, should the latter be made with compatible elements ?

thank you in advance to those who can answer me!

 

[DoctorBomber90]

Hello, peter. I've only been in this forum for a few months.
the answer to the first question is:
- Separately because the energy error, in addition to depend on the tension and, above all, as you do the mesh, depends also on the module of young.
example if I have a structure made of steel and aluminum (respectively 210 gpa and 70 gpa) you understand that you will always have a big percentage error. so estimate the percentage error for each individual material.
I'll give you a brief answer for the second question.