Learning Forum

[JanM]

Hello folks,

I'm trying to set up a simulation of an imperfect structure, i.e. perform an Eigenvalue-buckling analysis before the non-linear analysis to account for small distortions/deflections due to manufacturing for example.

In theory the procedure looks like this (most of you'll probably know this picture from various tutorials/lectures/presentations):

In my case the part is a composite structure build up in ACP, which is fine until "after" the Eigenvalue Buckling-block. My work-flow looks like this: 

My problem is, that i can only transfer the "deformed" shape of a Eigen-mode to the last static structural block (where the non-linear analysis should take place) but I lose the lay-up information of the composite-patches, (see below, only standard thickness and material are assigned, no imported plys):

I found kind of a work-around as i can attach a second ACP (Pre) block after the Eigenvalue-Buckling where I "reconstruct" my part with the slightly deformed shape:

As I'm working with a rather simple model this isn't too much hassle, but I can't imagine that's the intended work-flow.

Is it possible at all, what am I missing, how should the blocks be arranged?

 

Greetings Jan M.

[April Wang]

Hi,nSo from Eigenvalue Buckling to Static Structure, only geometry info is passed. nOne thing you can try is ton write out cdb file from Eigenvalue Buckling using cdwrite command. You will need to insert a Command Object under the Solution of Eigenvalue Buckling, the command writes as :n/post1n set,loadstep,substep # loadstep, substep are the numbers for the mode he wishes. Maybe it is first so 1,1 n /solun upcoord,factor # factor is how much to scale the displacements, it should be 1 for you if you don't want to scalen /prep7n cdwrite,db n2.create an External Data in WB, read in the cdb file n3.link the External Data to a static structure.Apriln