When using nonlinear mesh adaptivity in a linear analysis, the program enables the nonlinear solution algorithm automatically. You can also specify the full (NROPT,FULL) or unsymmetric (NROPT,UNSYM) Newton-Raphson solver option as required.
To ensure that at least one remeshing occurs during the analysis, you can set the
number of substeps as necessary (directly via NSUBST or indirectly
via DELTIM). Obtain guidance for setting the number of substeps from
the NLADAPTIVE,,ON,VAL1
value specifying
the remeshing frequency.
For linear elastic problems, it is common practice to apply the load as a single step in the first substep of the load step (KBC,1) as opposed to ramping it over the loadstep (KBC,0). In such cases, the smallest possible number of substeps is 2, ensuring at least one mesh refinement: