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What mechanical properties (E1, E2 NU12 G12 and RHO) should I put in the material cards MAT9, MAT10, MAT11 y MAT12 when are used for ply2, Ply3, Ply4 and Ply5 respectively? in "Composite optimization of a skateboard by Marius Mueller"

I am doing the "Composite optimization of a skateboard by Marius Mueller" and at the step 3.6 Ply generation, it is asking me to create 5 plies (Ply1, Ply2, Ply3, Ply4 and Ply5) with different card material. I have created Ply1 with material mat-carbon zero degree orientation and MAT8 (E1 110000, E2 8500 NU12 0.3, G12 4000 and RHO 1.7e-09) as is required. So, the question is what mechanical properties should I put on the following material cards, MAT9, MAT10, MAT11 y MAT12, used for ply2, Ply3, Ply4 and Ply 5 respectively?

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Adriano Koga_20259

I'm not familiar to this skateboard model, but probably you just need to use the same material for all these plies.

There's no MAT11, 12,...

You will use the same carbon fiber properties (MAT8) in all these plies, and the solver will perform the property transformation according with the ply orientation.

David_21519

I'm not familiar to this skateboard model, but probably you just need to use the same material for all these plies.

There's no MAT11, 12,...

You will use the same carbon fiber properties (MAT8) in all these plies, and the solver will perform the property transformation according with the ply orientation.

Hi,

Thank you very much Adriano for your answer.

There are 5 plies requirements as it is showed in the following image.

I have created carbon fibre material "mat-carbon" with MAT8 card and its own mechanical properties. I tried to use the same material, but when I change the card MAT8 to another e.i MAT9 it change all plies with the same material card MAT9. I meant, MAT8 just gone from ply1

Adriano Koga_20259

Hi,

Thank you very much Adriano for your answer.

There are 5 plies requirements as it is showed in the following image.

I have created carbon fibre material "mat-carbon" with MAT8 card and its own mechanical properties. I tried to use the same material, but when I change the card MAT8 to another e.i MAT9 it change all plies with the same material card MAT9. I meant, MAT8 just gone from ply1

This is very likely a typo or Excel thing.

All of them probably use the same material, same MAT8 for all, changing only orientation. Do not change the card image.

For shell composites you should only use MAT8 or MAT2 cards.

MAT9 and MAT9ORT are used for solids.

Maybe there is MAT10, but not for this usage. MAT11 and MAT12 i believe do not exist.