Interpret results

- July 5, 2019 at 2:51 pm
  
  mekafime
  Subscriber
  
  Hi everybody ,
  
  How could I interpret Ansys' results in von mises stress? For when I calculate the structure and the union according to the formulas indicated in the standard I get everything "OK", however the resulting as appreciated stress exceeds the permissible stress of the material.
- July 5, 2019 at 6:01 pm
  
  peteroznewman
  Subscriber
  
  Just because the surface stress has exceeded the material yield point does not mean the joint has failed. Maybe the standard looks at the average stress in a section, I don't know which standard you are talking about. The average stress through the wall thickness at the point you have labelled is much lower than the surface stress value shown on the label.
- July 5, 2019 at 8:14 pm
  
  mekafime
  Subscriber
  
  Hi Peter,
  
  I use Cidect, for the lower element:
- July 5, 2019 at 8:19 pm
  
  peteroznewman
  Subscriber
  
  I don't know what Cidect is.
- July 5, 2019 at 8:51 pm
  
  jj77
  Subscriber
  
  Not sure about cidect, but typically EC3 for ultimate limit states are governed by equations giving say N1.Rd (or Nc,Rd for axial force in beams or Mc,Rd for bending and so on) which is the maximum force or moments (they are not based on VM stresses).
  
  Thus to kind of compare, one could look at the ultimate load of these welded joint. So including plasticity, push the joint and obtain the load displacement curve.
  
  See here for an example (codes tend to be more conservative than the full NL FEA):
  
  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252015001102143
- July 5, 2019 at 9:01 pm
  
  mekafime
  Subscriber
  
  Hi,
  
  Cidect is similar to EC3. Thanks,