I'd like to define a press-fit contact. I have NO preprocessor but I already have the geometry of my model (as a text file containing nodes and elements). So I read the documentation (Quick Reference Guide and User's Guide) and added the necessary entries but I always got a fatal error:
*** USER FATAL MESSAGE 316 (IFPDRV) ILLEGAL DATA ON BULK DATA ENTRY BCTSET BCTSET 101 20 10
Here's the content of the file I run:
SOL 101 CEND ECHO=NONE BCSET=101 PARAM,PRGPST,NO SPC=1 $ BEGIN BULK $-------1-------1-------1-------1-------1-------1 BCPROPS 10 1000 BCPROPS 20 2000 $-------1-------1-------1-------1-------1-------1 BCTSET 101 20 10 $-------1-------1-------1-------1-------1-------1 SPC1 1 123456 2000682 thru 2001363 INCLUDE path of the shaft INCLUDE path of the hub ENDDATA
So I guess I'm wrong about how BCSET and BCPROPS work together. I also would like to find a way to indicate the press-fit contact, but I think this is not a problem, I just have to use either the cards MIND1 and MAXD1 of the BCTSET entry or the card OFFSET of an additionnal BCRPARA entry.
So I would like to know what I am doing wrong. A possibility would be to generate the text file with a preprocessor but I don't have any. So feel free to do it for me, or just tell me where I'm wrong
I'm using CTETRA elements with 4 nodes.
Thank you in advance
Solved! Go to Solution.
Illegal data type errors from the IFP (Input File Processor) module indicate a problem with the data on the specific card. Typically, this means a real value is supplied where an integer is expected; and integer value is supplied where a real is expected, or a required field is empty.
In the example given, your BCTSET card has data for fields 1-4 only
See Remark 6 for BCTSET (particularly the first bullet):
6.The following rules apply to MINDi and MAXDi:
You say you are using 3-D Solid CTETRA 4-nodes elements: well, for contact analysis is extremely important to use high-order elements, this is critical to account for accurate results, TET4 elements are "constant strain & constant stress" tetraedral, then better to use parabolid TET10 elements.
Also, the use of high-order elements with midside nodes located in the surface geometry will avoid undesired initial interference between corner-only nodes.
To learn more about how to solver "interfernce-fit" problems using NX NASTRAN please visit my blog in the following address: https://iberisa.wordpress.com/2012/01/16/tratado-c