I tried to come up with another practical case displaying high triaxiality (and therefore low ductility).
This is the fictitious case of two intersecting plate girders, with dimension taken from IPE600 and IPE300, respectively.
The material properties are taken from
@thschrader's DNV example. The deep plate girder is loaded in uniform tension and the shallow girder is fixed at the ends.
- Screenshot from 2022-09-11 12-45-40.png (30.65 KiB) Viewed 1032 times
CCX breaks down at a uniform tension of 356MPa and produces the following critical strain ratio.
- Screenshot from 2022-09-11 12-02-25.png (157.22 KiB) Viewed 1032 times
The maximum critical strain aratio at this load is only 0.015. The triaxiality is clearly not high enough to cause low ductility.
Finally a cut view in Paraview:
- Triaxiality 2.png (48.2 KiB) Viewed 1032 times
and the FC file for those who want to experiment