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PSHELL thickness limiting value

PSHELL thickness limiting value

PSHELL thickness limiting value

(OP)
hi friends,
I've recently joined the forum and have quite few doubts plz anyone among you guide me. And the question, what is the PShell element thickness limiting value for a plate to be considered as a shell element? Plz post your answers...

RE: PSHELL thickness limiting value

Pshell is the NASTRAN property of shell elements, yes? (CQUAD, etc) ... have you looked into the NASTRAN manual ?

if there's nothing written, investigate it for yourself ... model a plate with different loads (in-plane, out-of-plane) and vary the thickness and see how well the results compare with hand calcs. personally i would go much beyond the shortest element slide length as a thickness. another test would be how many elements through the thickness ? i think one should be ok, plates understand bending, but it's always good to find out things for yourself.

Quando Omni Flunkus Moritati

RE: PSHELL thickness limiting value

I could pay a monkey $10 an hour to push buttons on an FEA program and make pretty picutres. You are an engineer and not a monkey, correct? Do yourself and your organization a favor and learn at the very least some of the basic theory behind FEA and the physics behind what you are trying to model.

I don't beleive that there is any physical limit. I suppose I could make my shell elements 10 feet thick if I want to. If you understood FEA (or plate/shell, beam theory) you would know that the length to thickness ratio should be at least ten. Your FEA code came with a bunch of great reference material. Use it.

Also the above suggestion of making test models is a great one. I have been doing FEA for 20 years now (more if you count school) and I make little test models quite frequently.

FEA is like many other things-garbage in, garbage out.

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