I ran two different models (pushover analysis of 1.7 m H-steel). 1st model was based on Von mises failure criterion and the second model was based on Tesca failure criterion. When I compare the outputs, The model with Tresca gave me higher maximum load compared with that of Von-mises. Did anyone compare these two failure criterions? In Tresca model, Steel material was defined as follow: In plasticity Tab: 0 friction angle, 0 dilation angle, and in Cohesion Tab: yield stresses and plastic strains were defined as follow: first pair: (325 MPa;0), second pair: (490;0.18), third pair: (470;0.3). Yield stress for the material used in both models is 325 MPa. however, when I plot stress-strain relationships in tresca model, the material goes and yield around 700 MPa, is that normal that tresca produces higher stresses? How do you guys define Tresca for steel material in Abaqus?
It is strange, because normally v.Mises leads to higher overall loads comparing to Tresca, since the Tresca hexagon lies inside v.Mises circle.
BTW: your third pair has lower yield than the second one.
Dear Professor Sergey,
Exactly! I do agree with your comment. I do believe that Von mises should produce higher values. I will check my models again. I appreciate your comment.
It's right that Tresca hexagon lies inside Mises circle but it should be noted that this fact is in the case of estimated "Yield Point", i.e. Tresca approach estimates that the material yields by lower stresses.
But for comparing the predicted stresses such as the effective stresses you can see that the predicted stresses with Tresca is more (or equal to that of Mises):
The effective stress (Tresca)= S1-S3
The effective stress (Mises)= sqrt(( (S1-S3)^2 + (S1-S2)^2 + (S2-S3)^2)/2)
You can test the predicted values for all kinds of S1, S2 and S3 values; for example for S1=20, S2=10, S3=-20
The effective stress (Tresca)=40 The effective stress (Mises)= 36.05
BTW, Tresca in Abaqus: Properties\Mechanical\Plasticity\Mohr-Coulomb---> dilation angle=0 friction angle=0
would you please explain how you applied von mises failure criterion to your model?
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