Learning Forum

[1617836513]

The yield strength of the material is 275 MPa, there is a large area that does not reach yield but plastic deformation occurs, why is this?And how do I view the stress data for the integration points?

 

[Armin Abedini]

Hi Ji,

Could you plot the eq.stress of the elements where plastic strain is non-zero (the elements displayed in red in the your first picture)? 
It appears to me that they have passed the initial yield stress of the material, 275 MPa, leading to plastic deformation. Remember that plastic deformation occurs locally at the element-level; therefore, some other regions of the model can still be in the elastic region.

[1617836513]

Sorry I'm new to Ansys and I'm not familiar with some of its operations yet, so I don't know how to plot an equivalent force diagram for the localized region you're talking about. But I drew the stress-time-diagram and strain-time-diagram of the same node, and we can see that it has not reached yield, but its plastic strain is not zero.

[Armin Abedini]

Thank you Ji.
I can see that the plastic strain magnitudes are not zero, but extremely low. Could you plot the same plot for the element that undergoes the largest plastic strain? Based on the first picture, the maximum plastic strain is 0.0655 at that element. You can find this location but selecting the Maximum object from the Results tab (screenshot below).

[1617836513]

Ok, that's all.