Pretension steel cables in static structural analysis

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  • Last Post 26 April 2019
mfronk3 posted this 26 April 2019

 

 

 

 

I would like to simulate a test frame that I am designing for an experiment. The main frame is made of aluminum and there is an 8x8 grid of steel wires. The bottoms of the 4 upright aluminum posts are fixed to the ground. 

In the experiment I am planning to use turnbuckles to pretension each steel wire to 10 lbF each. How can I model this load in an ANSYS static structural simulation?

Thank you very much!

Matt

 

 

 

 

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peteroznewman posted this 26 April 2019

Hi Matt,

I have learned a lot about cables under tension from jj77 who is knowledgeable about this, and may have something to add.

A command called INISTATE creates an initial state of stress (or strain) in an element at the beginning of the solution. Look that up in the ANSYS Help system.

Attached is a model of a long cable that has an initial stress applied so you can see how it is done.

Since you want a force, you will have to calculate the stress that force will create in the cable. 

For a cable, Stress = Tension Force / Cross-sectional Area.

Pay attention to the units once you start using Command Objects.

Regards,
Peter

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mfronk3 posted this 26 April 2019

Thank you--Is there a way to do it in Workbench?

peteroznewman posted this 26 April 2019

Yes, that was all done in Workbench.

mfronk3 posted this 26 April 2019

Ok, great. I'll give it a shot.

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