Shell & Solid Composite Modelling Different Behaviour
Dear Everyone,
I am have been working with the shell modelling of composites, using the PCOMP-card and plies and laminate definition. I wanted to take it to the next step and try the modelling of composites using 3D elements. I have looked into the Shell to Solid Conversion of HyperMesh first and then started on my own using the PCOMPLS card. I modelled the exact same plate twice to see if I can re-do my 2D results in 3D. However I came to find that both results are vastly different.
Do you know how this could happen? Displacement of 111 vs. 37...
I have attached both of my files, could any one of you please have a quick check?
Any help would be greatly appreciated!
Best Regards,
Lennart
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Dear Rahul,
thank you very much for your answer.
I still could not resolve the issue, even with reviewed material constants. Could you elaborate on what you mean with my BCs? (I assume you mean SPC?) I do have free nodes there but those where just for designing the part.
BR,
Lennart
Yes I mean SPC constraints.Developement team suggested me to test shared file in internal beta build of 2019 version which yield closer with 2d & 3d element.
There are some changes after 2018 which affect the results.
Please find below some suggestion from my colleagues:
1.Make sure you convert MAT8 to MAT9 (or MAT9ORT) correctly. I always get messed up with v31 (OptiStruct MAT9ORT input) which is NOT equal to v13 (Typical value users have). I’ve done a few studies between PCOMP/G, PCOMPLS, and PSOLID and I get “reasonable” match….but admittedly I have not done a conclusive test. Also, double check your BCs…you have a few more nodes in PCOMPLS vs PCOMP/G that you have to get right between the two models. Just giving some guesses from my experiences.
2.The solid shell has a thickness direction that needs to be defined properly. Take hex8 for example, grids 1 2 3 4 lie on bottom of the shell and 5 6 7 8 lies on the top of the shell.