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# when to use 12I/T^3 and Ts/T in pshell card ?

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## when to use 12I/T^3 and Ts/T in pshell card ?

(OP)
hi guys,
could someone please elaborate on the subject?
thnx

### RE: when to use 12I/T^3 and Ts/T in pshell card ?

Please first elaborate on
- what you are modeling - specific material/layup/etc being modeled with the PSHELL card
- the properties for your material
- what your current PSHELL/MAT2 cards are
- the reason for your question

### RE: when to use 12I/T^3 and Ts/T in pshell card ?

(OP)
just in general ,wanted to know what nastran do with it.
I understand it saves me the trouble of calculating a new equivelent E and thickness when modeling hc panel.
does it mean the nastran stress output will be based on equivelent thickness and not on the user defined thickness ?
I mean would,lets say, shear_stress=force/(width*Ts/T)?
and how it treats the bs 12I/T^3 ?

### RE: when to use 12I/T^3 and Ts/T in pshell card ?

12I/T*3 and Ts/T is used when you are modeling a sandwich panel.

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