TwoNodeLink VS ZeroLength element

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yuri
Posts: 1
Joined: Thu Jan 09, 2020 3:08 pm

TwoNodeLink VS ZeroLength element

Post by yuri » Thu Jan 09, 2020 3:34 pm

Hello,
What is the difference between a TwoNodeLink element and a ZeroLength element? Which one of them is more appropriate to connect two nodes?
Thx
Last edited by yuri on Fri Jan 10, 2020 9:32 am, edited 1 time in total.

STKO Team
Posts: 325
Joined: Tue Oct 29, 2019 8:45 am

Re: TwoNodeLink VS ZeroLength element

Post by STKO Team » Fri Jan 10, 2020 8:59 am

The main difference between ZeroLength and TwoNodeLink is that the former does not couple translational and rotational DOFs despite of the distance between master and slave nodes. The latter instead couples translational and rotational DOFs if there is a distance between the master and slave nodes.

Then there are some other minor additional features in the TwoNodeLink that you can see here

angga-fajar
Posts: 8
Joined: Fri Jul 31, 2020 1:52 pm

Re: TwoNodeLink VS ZeroLength element

Post by angga-fajar » Fri Jul 31, 2020 2:06 pm

Dear STKO Team

Hello,

I have made numerical model of bracing with shear panel damper (SPD). The SPD to be idealized as two node link element. However, in post processor, I have tried to find the force and deformation output of those element. But I can not find to choose the option to display the force and deformation of link element in STKO Post Processor. Would you like to give me suggestion?

Thank you.

STKO Team
Posts: 325
Joined: Tue Oct 29, 2019 8:45 am

Re: TwoNodeLink VS ZeroLength element

Post by STKO Team » Sat Aug 08, 2020 11:22 pm

TwoNodeLink elements have a collection of 1 or multiple uniaxial materials, 1 for each DOF. In the MPCORecorder you can choose material.strain and material.stress to output the deformation and forces, respectively.
Then you will be able to visualize them with the GaussPlot.

angga-fajar
Posts: 8
Joined: Fri Jul 31, 2020 1:52 pm

Re: TwoNodeLink VS ZeroLength element

Post by angga-fajar » Fri Aug 21, 2020 2:11 am

Dear STKO,

Thank you for the suggestion. I have tried to display the Two Node Link Element response following your suggestion, as illustrated in the attached figure.
However, no selected element result and no output can be plotted. Could you help me for that problem?
Thank you.

Regards
2020-08-21_08h59_42.png
2020-08-21_08h59_42.png (66.28 KiB) Viewed 527 times
2020-08-21_08h59_42.png
2020-08-21_08h59_42.png (66.28 KiB) Viewed 527 times
2020-08-21_08h59_42.png
2020-08-21_08h59_42.png (66.28 KiB) Viewed 527 times
Attachments
2020-08-21_09h00_25.png
2020-08-21_09h00_25.png (57.65 KiB) Viewed 527 times
2020-08-21_09h00_13.png
2020-08-21_09h00_13.png (80.13 KiB) Viewed 527 times

angga-fajar
Posts: 8
Joined: Fri Jul 31, 2020 1:52 pm

Re: TwoNodeLink VS ZeroLength element

Post by angga-fajar » Fri Aug 21, 2020 2:14 am

Here the final Table that should have the data of force and deformation of Two Mode Link Element
2020-08-21_09h01_05.png
2020-08-21_09h01_05.png (4.97 KiB) Viewed 527 times

STKO Team
Posts: 325
Joined: Tue Oct 29, 2019 8:45 am

Re: TwoNodeLink VS ZeroLength element

Post by STKO Team » Fri Aug 21, 2020 8:33 am

Dear user,

To extract data from Gauss Points you need to select the gauss point, thus first you need to create a GaussPlot. with that plot you will be able to select the gauss point you want.
gp_2nlink.png
gp_2nlink.png (118.22 KiB) Viewed 521 times
Likewise, to extract data from fibers, you will need a fiber plot.
Surface plots can only be used to extract data from nodes.

angga-fajar
Posts: 8
Joined: Fri Jul 31, 2020 1:52 pm

Re: TwoNodeLink VS ZeroLength element

Post by angga-fajar » Fri Aug 21, 2020 12:34 pm

Dear STKO,

Thanks a lot for the guidance, that's work well.

Regards,

Telec
Posts: 25
Joined: Sun Oct 11, 2020 8:27 am

Re: TwoNodeLink VS ZeroLength element

Post by Telec » Thu Nov 19, 2020 12:02 pm

STKO Team wrote:
Fri Jan 10, 2020 8:59 am
The main difference between ZeroLength and TwoNodeLink is that the former does not couple translational and rotational DOFs despite of the distance between master and slave nodes. The latter instead couples translational and rotational DOFs if there is a distance between the master and slave nodes.

Then there are some other minor additional features in the TwoNodeLink that you can see here
Hi, are there any application examples of the TwoNodeLink element in STKO?
Also a curiosity: if the translational degree is coupled with the rotational one, in the presence of a distance between the two nodes, does it mean that the final translation effect of the slave node is the same as that obtained with a Beam-type RigidLink?
Ux(slave) = Ux(master)-Rz(master)*dy
Uy(slave) = Uy(master)+Rz(master)*dx
Rz(slave) = Rz(Master)
in this case the TwoNodeLink can be seen as a Beam-type RigidLink but with the possibility to choose the material in the different degrees of freedom and therefore the stiffness of the connection?
thx

STKO Team
Posts: 325
Joined: Tue Oct 29, 2019 8:45 am

Re: TwoNodeLink VS ZeroLength element

Post by STKO Team » Fri Nov 20, 2020 9:53 am

Hi, are there any application examples of the TwoNodeLink element in STKO?
Actually I've never had the need to use it...

If you have an example test case for which using the 2nodelike is worth it, try to model it and post here any doubt, so that we can help you

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