Combine line-Elements with solid-elements

[Anonymous]

Hello,

i want to transmit a torque into a hole by a 1D Bar-element. The hole surface is connected to a point in the holecenter (rigid body connector) as shown in the pictue attached. I implemented the line-element with an extra sketch, starting point at the centerpoint. Processor is solving but do not give any results.

Im working with Inventor 2016 and Nastran in CAD 2016

Output gives the following warings:

Warning: T2061 Unreasonable Material Data

Warning: E5010 One or More non-Zero Degrees of Freedom were Auto-constrained

I think it is a DOF-problem or a problem with the sketch? I hope somebody can help?

much thanks!

[Anonymous]

Hello,

i want to transmit a torque into a hole by a 1D Bar-element. The hole surface is connected to a point in the holecenter (rigid body connector) as shown in the pictue attached. I implemented the line-element with an extra sketch, starting point at the centerpoint. Processor is solving but do not give any results.

Im working with Inventor 2016 and Nastran in CAD 2016

Output gives the following warings:

Warning: T2061 Unreasonable Material Data

Warning: E5010 One or More non-Zero Degrees of Freedom were Auto-constrained

I think it is a DOF-problem or a problem with the sketch? I hope somebody can help?

much thanks!

[Roelof.Feijen · Accepted solution]

Hi @Anonymous,

Warning T2061: Unresonable Material Data should not be the problem. 

Causes:

• Material is improperly defined.
• An unreasonable shear modulus has been provided.
  If a correct shear modulus has been entered, this warning may still show due to round-off error. The solver will always calculate shear modulus based off of Poisson's ratio and Modulus of elasticity and compare to the entered shear modulus value. If they do not match exactly (entered value is rounded, calculated value has 16 significant digits) they it will give the warning.

See also: https://knowledge.autodesk.com/support/nastran/troubleshooting/caas/sfdcarticles/sfdcarticles/Warning-T2061-Unresonable-Material-Data.html

WARNING: E5010:

Do you have contacts defined in your analysis?

If so. Is it a manual contact that is being set to Auto?

Can you otherwise share your model? From the picture it is hard to tell whats wrong.

[Roelof.Feijen · Accepted solution]

Hi @Anonymous,

Warning T2061: Unresonable Material Data should not be the problem. 

Causes:

• Material is improperly defined.
• An unreasonable shear modulus has been provided.
  If a correct shear modulus has been entered, this warning may still show due to round-off error. The solver will always calculate shear modulus based off of Poisson's ratio and Modulus of elasticity and compare to the entered shear modulus value. If they do not match exactly (entered value is rounded, calculated value has 16 significant digits) they it will give the warning.

See also: https://knowledge.autodesk.com/support/nastran/troubleshooting/caas/sfdcarticles/sfdcarticles/Warning-T2061-Unresonable-Material-Data.html

WARNING: E5010:

Do you have contacts defined in your analysis?

If so. Is it a manual contact that is being set to Auto?

Can you otherwise share your model? From the picture it is hard to tell whats wrong.

[Anonymous · Accepted solution]

There are no contacts in my model. Just one part mixed with a bar.

after deleting shear modulus Nastran give me results. I did not expect an error caused by material properties.  I thought the problem would be due to the degrees of freedom or a fail in meshing.

Thank you!

[Anonymous · Accepted solution]

There are no contacts in my model. Just one part mixed with a bar.

after deleting shear modulus Nastran give me results. I did not expect an error caused by material properties.  I thought the problem would be due to the degrees of freedom or a fail in meshing.

Thank you!