Q:What does “188” stand for ?
It stands for beam188 beam element (or short 188).
As for the other question soild226 (short 226), they have SENE as well, so the script to get that is the same as above but change the esel to select the 226 elements (coupled field):
Finally inside mechanical we can post process strain energy with the user defined result (set expression ):
See the help manual for more info if needed.