Equivalent Plastic Strain MSC Nastran

[thecadguy]

Dear All,

I am new to non linear analysis and using MD nastran and Hypermesh 10.0. I am running Sol 601 and request all outputs of strain in hypermesh. The solution runs fine and when I post process the only strain I get out of the .Op2 file is strain(t). Does anyone know how i can get the EPS to post porcess. I probably need to request it in the .BDF file prior to solving but believe HM may not support this.

Thanks in advance.

Thecadguy

 

[thecadguy]

Dear All,

I see that Nastran writes out a .marc file which probably has the output request for Equivalent Plastic Strain. The default marc solution results file .t16 reports component of plastic strain tensor (t)as default. it looks like I need postcose 27 to get EPS.

This is where I need the help. What values do I request in Hypermesh to cause nastran to tell MARC to request the EPS or postcode 27?

Please does anyone have an answer. I appreciate some feedback.

Thanks

 

[thecadguy]

Dear all,

Does anyone have any comments? I would appreciate any help. I did find that i was not using the MARCT16 PARAM so it was defaulting to MARCT16=2. This was only giving me the default results. I was able to get the equivalent plastic strain result by setting MARCT16=1. However, this gave me much more than I needed and I dont want all the overhead of solving and file size.

Is there a way just to cherry pick the outout. I did find the MARCOUT PARAM which may appear to be the answer. The user guide states that don't use it wuth the MARCT16 and just specific the CODE MARCOUT E27. DO I need to declare this with the PARAM,MARCOUT,E27 or leave the PARAM off the documentation is unclear.

However, when I tried this it did not work. I think I am close, but could really use some assitance.

Thanks in Advance.

 

[ZeroExperience]

Your research is in the right direction. The .bdf or .dat file should have PARAM,MARCOUT,E27 to output EPS, per the information in the documentation. Look at my example:

http://i.imgur.com/CRmdUkr.png

.

In my example, I would manually type: param,marcout,e321,e341,e27. Field 1 is PARAM, Field 2 is MARCOUT, Fields 3 and on specify the Marc Output code and the order of e321,e341, e27 doesn't matter.

I doubt Hypermesh can write SOL600 md nastran input files. The most Hypermesh can write is linear stuff like SOL101, 103, 105, etc. Have you considered Patran?