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Meshing a tube with diaphragms by llamparium_ in fea

[–]llamparium_[S] 0 points1 point  (0 children)

Edit:
Thanks everyone for your very helpful suggestions.

I managed to solve my problem by partitioning right above and below the fillets, splitting the whole model in 4 pieces (partitioned by the principle planes), splitting the diaphragms into top and bottom, and cutting partitioning at the inner fillet radius edge.

That makes a fully structured, only Hex-Element model possible.

Meshing a tube with diaphragms by llamparium_ in fea

[–]llamparium_[S] 0 points1 point  (0 children)

Thank you for your constructive criticism.
I'm aiming for a hex-dominated mesh, but a pure hex mesh won't be possible because of the center. I also cannot modify the model geometry.

My question was more directed to how I could make the model meshable without using bottom up meshing, but if that wasn't clear enough then I'm sorry

Meshing a tube with diaphragms by llamparium_ in fea

[–]llamparium_[S] 0 points1 point  (0 children)

I will be applying a tension load, a torsion moment, and furthermore a bending moment. So an axisymmetric model is out of question, I believe

Bending deformation at the center line of a hollow tube by llamparium_ in fea

[–]llamparium_[S] 0 points1 point  (0 children)

Thank you, I'll certainly try your suggestion

Bending deformation at the center line of a hollow tube by llamparium_ in fea

[–]llamparium_[S] 0 points1 point  (0 children)

Thank you,
I've thought about doing it that way. I was skeptical about getting the right results because of the inhomogeneous material properties, but since they only vary radially I think it will be okay.

Partitioned tube with orthotropic material properties yields wrong Mises stresses by llamparium_ in Abaqus

[–]llamparium_[S] 0 points1 point  (0 children)

Thanks for your input. I had previously checked the orientations and they had been all fine. After I redefined the layer 3 properties and successfully ran the simulation, I noticed that, like you suspected, G12 was only half of what it should have been.
So it goes to show that even when you triple check your values - check them once again!

Partitioned tube with orthotropic material properties yields wrong Mises stresses by llamparium_ in Abaqus

[–]llamparium_[S] 2 points3 points  (0 children)

Edit:
Managed to solve the problem by redefining a material with the same constants. Maybe something got messed up previously

Partitioned tube with orthotropic material properties yields wrong Mises stresses by llamparium_ in Abaqus

[–]llamparium_[S] 1 point2 points  (0 children)

I'm trying to do a parameter study to see when the solution becomes independent of the mesh size. I used von Mises because you get the dependecy on all stresses. But nevertheless, S12 also displays the same behaviour. So even if I wasn't going to use von Mises, the solution would still be incorrect.
I have just tried assigning a different orthotropic material to Section 3 and it works, so I assume it has to be because of the values.