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If using this toolbox for research or industrial purposes, please cite:
Advances in Engineering Software. Vol 105. March 2017. Pages 9-16. (2017)
Abaqus2Matlab v.3.0
A new way to post-process FEA
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There are two options to find the relative displacements:
1) Use the following options for defining a local coordinate system that is fixed to the center of the part and moves with it:
*NSET,NSET=NSET1 <nodes defining the part in question> *TRANSFORM,NSET=NSET1,TYPE=R <data line to define a transformed coordinate system> *NODE FILE,NSET=NSET1,GLOBAL=NO U
2) Subtract the displacement of the center of the part from the displacements of all nodes defining the part. In this way you will get a displacement field with respect to the part center.
I hope that the above help you. Let me know if you need further guidance regarding this.
Best regards.