(Abaqus) Cause for error when making moment?

trogcfd · June 22, 2021, 23:28

I have a node problem where the nodes do not appear on the list and running a job does not complete due to a node DOF error.

What does it mean when "nodes have inactive dof on which boundary conditions are specified?"

I am trying to create a moment load.

Error in job Job-1: 2 nodes have inactive dof on which boundary conditions are specified. The nodes have been identified in node set ErrNodeBCInactiveDof.

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.

here is the image link:

https://imgur.com/a/dJ1f6DA

Aeroalx · June 25, 2021, 04:16

What kind of elements are you using? Probably they don't have a dof associated to dof that you maight have constrained. Share your file and I'll have a look if you want.

calim_cfd · June 30, 2021, 12:02

It looks like you're using solid elements. These normally don't have rotation dofs.. just translation... which means that you cannot apply concentrated moments on any node in your mesh. You need to create the moment load with force couples. Or you could just use 1D beam elements and it will solve all your problems.

Reminder: moments and twists are macroscopic loads, hence, by definition, you cannot have it on a point/node if your element is not macroscopic too, like beams.

Hope it helps

June 22, 2021, 23:28	(Abaqus) Cause for error when making moment?	#1
trogcfd New Member Dan Howard Join Date: Jun 2021 Posts: 1 Rep Power: 0	I have a node problem where the nodes do not appear on the list and running a job does not complete due to a node DOF error. What does it mean when "nodes have inactive dof on which boundary conditions are specified?" I am trying to create a moment load. Error in job Job-1: 2 nodes have inactive dof on which boundary conditions are specified. The nodes have been identified in node set ErrNodeBCInactiveDof. 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. here is the image link: https://imgur.com/a/dJ1f6DA

June 30, 2021, 12:02		#3
calim_cfd Senior Member mauricio Join Date: Jun 2011 Posts: 172 Rep Power: 18	It looks like you're using solid elements. These normally don't have rotation dofs.. just translation... which means that you cannot apply concentrated moments on any node in your mesh. You need to create the moment load with force couples. Or you could just use 1D beam elements and it will solve all your problems. Reminder: moments and twists are macroscopic loads, hence, by definition, you cannot have it on a point/node if your element is not macroscopic too, like beams. Hope it helps __________________ Best Regards /calim "Elune will grant us the strength"

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June 25, 2021, 04:16		#2
Aeroalx New Member Alejandro da Silva Join Date: May 2020 Location: Spain Posts: 2 Rep Power: 0	What kind of elements are you using? Probably they don't have a dof associated to dof that you maight have constrained. Share your file and I'll have a look if you want.