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Error 14: Missing Mat # 3

Hi,

I am a new user to Hyperworks. I am trying to analyse and optimize a composite monocoque chassis. I haven't gotten to the optimization part yet as I'm stuck trying to even run the analysis. Every time I try to run the analysis I get the following error:

*** ERROR 14: Missing MAT # 3 referenced by PLY # 3,
(existing MAT with this ID is of incorrect type).
*** ERROR 14: Missing MAT # 3 referenced by PLY # 8,
(existing MAT with this ID is of incorrect type).

What I have done is that I have a symmetric stack of 2 layers of carbon fiber, aluminium honeycomb and 2 layers of carbon fiber. I have defined carbon fiber as MAT 8 and the honeycomb as MAT9ORT. The property I have specified for the geometry is PCOMPP. I have added pin joints to the rear suspension and a torsional load at the front suspension.

I understand that another thread has been posted about this but I don't understand what the replies are telling me to do. Any help would be appreciated.

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Altair Forum User

Hi @s.selvarajoo

Looks like you assigned an incompatible material t PLY 3 and PLY 8. Shell elements are used to model PLYs and MAT8 card is the right material card to use for PLYs (in your case)

If you are assigning MAT9 ORT (material ID# 3) for PLYs, this is not compatible. Please check and update the same.

Altair Forum User

Hi Prakash,

Sorry for the late reply.

I have finally gotten the time to get to this. Your solution worked but I'm still unclear about a few things
Ply 3 and 8 are my core material. I am given material properties in 3 directions for my core material. Choosing MAT8 will only allow me to input material properties pertaining to 2 axis. Will this adversely affect my solution?
Also, does the number '1' in any material property, for example, G12, refer to the X direction?

Altair Forum User

Hi,

In that case you can model your with solid elements and use MAT9ORT.

G12 defines the inplane shear (material coordinate system)

Altair Forum User

So I would need to import a solid geometry representing the core of the laminate?

Will the contacts be automatically set or do I have to set them myself?

Altair Forum User

@s.selvarajoo

No contacts will not be set automatically. You need to takecare of the contacts or nodal connectivity

Altair Forum User

Okay, thanks Prakash!