Dear everyone,
I am modeling the fatigue crack propagation using ABAQUS XFEM. In 2D domain, the plane strain element is used, while 3D stress in 3D domain. As you can see in figure, 2D provides good comparison with the experiment. However, when i try to analyse in 3D domain (all details i.e: fracture criterion, are remain the same), the crack growth rate are not as expected.
Could anyone of you give me some advice to cater this problem?
Thank you in advance.
Hi, Nazirah.
First of all, I never used this program, but I looked at your picture and it made me curious.
It seems that you have a numerical problem, that detected some kind of buckling (little load increment and big size displacement).
This behavior indicates that the structure lose stability (stiffness went to zero).
Maybe the model must have some kind of data missing for the 3D solution (for example, torsion, warping).
Other possibility are somekind of finite element numerical formulation requirement (some pin code information) or it is not proper adjusted to this type of analisys (the last tip seldom is the case).
I hope this could help you.
Good luck.
we do not expect them to be equal. 2D modeling cannot offer the same results as obtained by 3D modeling unless the 3D structure is close to geometry bounds: plane stress/strain. Also be carefull about the tip enrichment functions used in 2D and 3D
I think this is linked to the loading, please check your loading in the case of 3D model (the load should be the same as in experiment, but smaller in the case of 2D)
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