Is there any specific reason for not including a function to read output of the deformation gradient tensor (Rec30)? I was thinking about writing my own function based on the format you've already established (ie. reading total strain at integration points) but wanted to make sure there weren't any strong reasons for why this might be more difficult than reading other data types.
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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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I forgot to let you know that writing Rec30.m was very simple! Although not ideal, my solution to the overall problem is to calculate strains in Step2 relative to Step1 and then use Matlab to write a vtk file that can be read by paraview. More laborious than I originally wanted, but it gets the job done.
Best,
Stephen