How to create a rigid picture frame (square) with rotating corners ?
How to create a rigid picture frame (square) with rotating corners ?
(OP)
I am trying to simulate a picture frame test, in order to study wrinkling in thin shells. I found a thesis where its done something similar, but i am not able to understand how to actually do it, since i keep getting errors in element section with rigid wires ( that cant be assigned sections).
Would somebody explain to me how to emulate that rigid frame, i am new to abaqus and have not been able to understand how to make the parts, connections and constrains necessary to build a rigid frame as presented in this thesis.
Thank you.
Would somebody explain to me how to emulate that rigid frame, i am new to abaqus and have not been able to understand how to make the parts, connections and constrains necessary to build a rigid frame as presented in this thesis.
Thank you.





RE: How to create a rigid picture frame (square) with rotating corners ?
But be careful to not create an overconstraint.
I would say in 3D you need 3 hinge connector and one connector, that locks the remaining two translational DOFs. That could be a Cartesian with rigid elasticity in those 2 DOFs.
RE: How to create a rigid picture frame (square) with rotating corners ?
RE: How to create a rigid picture frame (square) with rotating corners ?
RE: How to create a rigid picture frame (square) with rotating corners ?
RE: How to create a rigid picture frame (square) with rotating corners ?
RE: How to create a rigid picture frame (square) with rotating corners ?
RE: How to create a rigid picture frame (square) with rotating corners ?
Little trick: Translate some instances a little bit in Assembly module to ease the creation of the constrains and connectors. Afterwards you can move the instances back to their original position. The definitions don't change with that. See my other model in the .cae file as an example.
But there is one limitation: When doing that, you just have to prevent using the option, that creates local orientations in the connection builder between the two points. This method takes the locations of the two points. When you move the instances back and the two points have the same coordinates, the update of this method fails. The workaround is, to reference on a existing local CSYS in the connection builder. Then it is no problem when the two nodes of a connector have the same location.