RE: Nonlinear spring modification in Abaqus 2017 input file

You cannot import options that aren’t supported within Abaqus/CAE.  The Abaqus/CAE interface does not support the definition of field-dependent spring stiffnesses, and therefore it doesn’t support the import of that option.  In general, once you’ve edited the keyword file (the solver input file), you are done with Abaqus/CAE.  At this point all you can do is submit the job to the solver using the command line.  You can, of course, still postprocess the analysis using Abaqus/CAE.  Note also that you can use the keyword editing feature in Abaqus/CAE to make your modifications to the input file a feature of the Abaqus/CAE database.

Regards,

Dave Lindeman
Staff Scientist
Corporate Research Systems Laboratory
3M Center 235-3G-08
St. Paul, MN 55144
651-733-6383

From: [email protected] [mailto:[email protected]]
Sent: Saturday, November 03, 2018 6:12 PM
To: [email protected]
Subject: [EXTERNAL] [Abaqus] Nonlinear spring modification in Abaqus 2017 input file



Hi, I am a researcher who is a novice for ABAQUS/CAE.

My purpose is to model horizontal non-linear spring in between base and concrete slab.

So, first I modelled horizontal spring element in between the slab and soil base via ABAQUS/CAE and it appeared in the input file as below:

------------------------------------------------------------------------------------------------------------------

*Spring, elset="Horizontal Spring-spring"
2
500.
*Element, type=Spring1, elset="Horizontal Spring-spring"
33121, 2
33122, 3
33123, 5

------------------------------------------------------------! ---------------------------------------------------------
And to modify it into nonlinear spring, I add nonlinear and dependencies command beside elset in "Spring line and add nonlinear relationship between force and relative displacement as follows:

------------------------------------------------------------------------------------------------------------------

*Spring, elset="Horizontal Spring-spring", NONLINEAR, DEPENDENCIES=1
2
-6480000., -0.01
-3240000., -0.005
0., 0.
3240000., 0.005
6480000., 0.01
*Element, type=Spring1, elset="Horizontal Spring-spring"
33121, 2
33122, 3
33123, 5

------------------------------------------------------------------------------------------------------------------

However, when I tried to import the input file to ABAQUS/CAE 2017, it showed the error message as such:

WARNING: The following keywords/parameters are not yet supported by the input file reader:
-------------------------------------------------! -----------------------------------------------------------
*PREPRINT
*SPRING, DEPENDENCIES, NONLINEAR

------------------------------------------------------------------------------------------------------------

And the imported model seemed without horizontal springs which are supposed to be nonlinear.

I tr! ied several ways but results looked same.

Would you please let me know why Abaqus input file reader cannot read nonlinear command modified in the input file even though those commands are described in the manual?

Or just my modification is wrong?

Thank you,

Hoonill







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