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Error with 'Force balance' option

Hello, Please refer to the attached screenshots. I get this error only when the force balance is checked. What could be the reason here? I am using the force balance output to get the net resultant force in the bolt region made of solid elements.

Thanks and best regards,

Su

 

7 REPLIES

Re: Error with 'Force balance' option

Here's the Femap model in zip format.

Re: Error with 'Force balance' option

What version of Femap and Nastran are you using?

Your model with force balance request works fine in Femap 11.3.2 and NXN 11.0

 

Regards,

Joe

Re: Error with 'Force balance' option

Hello Joe, thanks for your response. I am using Femap 11.2.0 and I don't know how to check the NXN version.

Is there a way to fix this problem in the version I have?

Best regards,

Su

Re: Error with 'Force balance' option

You can always find the version of Nastran in the header of the f06 file.

 

Looks like Femap 11.2 uses NXN 10.1and there is a documented PR # 8252204 for this issue. It has been fixed in NXN 10.2 and later versions. Femap 11.2.1 and later versions should work fine with the force balance request.

 

Regards,

 

Joe

 

Re: Error with 'Force balance' option

Hello Joe,

 

I have Femap 11.2.0 and NXN 10.1.

 

Is there a way to fix the force balance problem in this version?

 

Regards,

Su

Re: Error with 'Force balance' option

Unfortunatley, there is no avoidance for this error except to turn off the "Force balance" option. 

With the force balance turned off, the only data data available is the contact and traction force output. You would need to come up with a way to isolate one side of the contact interface and then sum up the nodal contact forces.

By far the best option is to get access to the latest release of Femap/Nastran.

Re: Error with 'Force balance' option

Ok, thanks!