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Kinematic coupling with Abaqus interface - how to?

Question

Hello,

 

I'm trying to model a simple model of a bending beam with a kinematic coupling. A single node is to be coupled with a surface and applied a load to, so the load can be evenly distributed to the part. I have used this tutorial here:

 

https://www.sharcnet.ca/Software/Hyperworks/help/hm/hmbat.htm?pre_processing_for_bracket_and_cradle_analysis_using_abaqus_hm_4340.htm

 

I followed points 7-10, but when I try to import and solve the input deck with Abaqus, the following message pops up:

 

WARNING: The following keywords/parameters are not yet supported by the input file reader:
---------------------------------------------------------------------------------
*KINEMATICCOUPLING
The model "coup" has been imported from an input file. 
Please scroll up to check for error and warning messages.
The job "coup2" has been created.
The job input file "coup2.inp" has been submitted for analysis.
Error in job coup2: NODE SET ASSEMBLY__M4 HAS NOT BEEN DEFINED
Error in job coup2: A CONCENTRATED LOAD HAS BEEN SPECIFIED ON NODE SET ASSEMBLY__M4.  THIS NODE SET IS NOT ACTIVE IN THE MODEL
Job coup2: Analysis Input File Processor aborted due to errors.
Error in job coup2: Analysis Input File Processor exited with an error.
Job coup2 aborted due to errors.

 

It seems as the coupling would not have been defined properly, but I cannot see where as I don't know how to activate a specific node. Also, the key word is apparently unknown, which is rather odd. I've attached the input file, any help/advice are welcome.

coup.inp

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9 answers to this question

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Hi again, I got it to work in the meantime. First of all, I forgot to create a property for the rigid elements and second, I didn't define the slave surface properly.

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Hi again, it's been a while since I used Abaqus and I am facing the same issue. Abaqus tells me:

 

The model "test" has been created.
The part "PART-1" has been imported from the input file.
WARNING: Unknown assembly level element set RIGIDS. This occurred while processing rigid body definition. The rigid body definition will be ignored. 

WARNING: The following keywords/parameters are not yet supported by the input file reader:
---------------------------------------------------------------------------------
*KINEMATICCOUPLING
The model "test" has been imported from an input file. 
Please scroll up to check for error and warning messages.

 

When trying to run a job, the following pops up:

 

The job "Job-1" has been created.
The job input file "Job-1.inp" has been submitted for analysis.
Error in job Job-1: NODE SET ASSEMBLY_LOADSET HAS NOT BEEN DEFINED
Error in job Job-1: A CONCENTRATED LOAD HAS BEEN SPECIFIED ON NODE SET ASSEMBLY_LOADSET.  THIS NODE SET IS NOT ACTIVE IN THE MODEL
Job Job-1: Analysis Input File Processor aborted due to errors.
Error in job Job-1: Analysis Input File Processor exited with an error.
Job Job-1 aborted due to errors.

 

 

 

So, why is the set not defined or exported from HM? Where's my error? HM version is 14, Abaqus version is 2017.

test.inp

test.hm

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Please make sure while exporting files under the entity state browser SET should be active for all defined set.

Entity state browser.JPG

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Hi,

 

the sets are active. The boundary condition is imported properly into Abaqus. The only thing missing in Abaqus is the nodeset the concentrated force is applied on, which is odd.

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Please cross check whether you are facing this issue for same file or all files. Also try deleting setting files & check below link for same.

 

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I tried that and it persists within all my models. I think I don't define the coupling in HM properly since it's the only thing that does not work when imported. My workflow is as follows:

 

1. Create mesh

2. Create temporary node, move to set "refnode"

3. Create node set "loadset" to be coupled

4. Go to 1D → Rigids, elem type = KINCOUP. Independent = "refnode", dependent nodes = "loadset"

5. Move KINCOUP elements to collector "rigids"

6. Create solid property card for part with material card, assign property to solid and material to property

7. Create rigid property card, assign it to "rigids" collector, assign material to the property, under Elset options: Component name = "rigids"  

8. Set temporary node "refnode" as reference node

9. Create CLOAD in load step browser, with node set = "refnode"

 

I tried not assigning a material to the rigid property and I tried deleting the temporary node and assigning the created node from the rigids as reference node. No couping is imported into Abaqus. I don't see where the error is.

 

Error:

 

WARNING: Unknown assembly level element set RIGS. This occurred while processing rigid body definition. The rigid body definition will be ignored. 

WARNING: The following keywords/parameters are not yet supported by the input file reader:
---------------------------------------------------------------------------------
*KINEMATICCOUPLING

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Thanks for letting us know the steps you are following for analysis. Please make sure don't assign material & property to KINCOUP element. I just referred HM -Abaqus tutorial & there they recommend not to create mat props for KINCOUP. So try same & check. PFA screenshot for your reference. Also let us know the HM version & patch you are using at your end.

Updates & sytem info.JPG

KINCOUP.JPG

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I just tried to use COUP_KIN instead of KINCOUP and it works! I don't know why, but it does. For reference, my version is 14.0.110.

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