Choose a channel featured in the header of iMechanica:
The Abaqus documentation, available here:
https://abaqus-docs.mit.edu/2017/English/SIMACAEMODRefMap/simamod-c-inpu...
states the following:
Certain keywords must be used in conjunction with other keywords; forexample, the *ELASTIC and *DENSITY keywords must be used in conjunction with the *MATERIAL keyword. These related keywords must be grouped in a block in the input file; unrelated keywords cannot be specified within this block.
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