For a Nastran SOL106 nonlinear run, +1000 load cases were run in one BDF. The output fringe plots titles show load increments higher than 100%. How can the customer be reassured that this is normal? Is there a reference in the Nastran QRM? Thanks
For a Nastran SOL106 nonlinear run, +1000 load cases were run in one BDF. The output fringe plots titles show load increments higher than 100%. How can the customer be reassured that this is normal? Is there a reference in the Nastran QRM? Thanks
Since there is no reference in the manuals that can be quoted, this is how it is explained to our client: For the speed of processing, we have chosen to solve multiple load cases in one Nastran-run. The load cases are all independent and not chained. In this way, only one input-file or bulk data file (BDF) is needed for multiple load cases.
As result, only one output-file .xdb is generated, and also only one .f06, .rcf, .log, .op2, .f04, etc.
When multiple load cases are run sequentially in a nonlinear analysis, for the first load case the increment of the applied load is from 0% to 100%. For the second load case, the increment is referenced from 100% to 200%, and this percentage increments 100% per load case. So if 15 different (independent) load cases are solved in one Nastran-run (one BDF-file), you will get an increment of 1500% for the last case. The traditional way is to make a BDF for each load cases and run in batch, but you end up with many files.
