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12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 1/9
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Applying Constraint Equations in Workbench 12.1
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Author Message
sourabh.kulkarniUser
Joined: 05 Feb 2009Posts: 8
Posted: Mon Feb 14, 2011 12:06 pm
Dear Ansys users,
I am working with a telescopic cylinder assembly model subjected to axial
and moment load in its extended state. The hollow cylinders overlap each
other over a length of 1" in the extended state. One end of the cylinder is
fixed and other end is free. Moment / Force is applied at the free end. My
aim is to use constraint equations to transfer load between parts instead
of contacts. The reason for this is, at a later stage there will be a pressure
load separating the overlapping areas. I have looked up help files for
Constraint Equations in Ansys 12.1 and created my model. I have outlined
my approach in the following bullet points.
* imported model in Ansys 12.1.
* deleted automatically generated contacts.
* created remote points for overlapping areas.If I understand this right
what is being done here is the areas linked to remote points are
connected by rigid elements (creating spiders).
* applied constraint equations to the two remote points in all directions.
* applied force / moment on one end and fixed the other end of the
assembly.
* solved the problem and checked for reactions.
* I have also uploaded the files (geometry + workbench cleaned file) on
"http://www.4shared.com/file/AmLnh_BQ/test.html"
It would be very helpful to know if this is an acceptable way to apply
constraint equations in ansys workbench 12.1. I wanted to make use of
the tools available in workbench.
Thanks,
Sourabh. Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive,
Rockford, IL - 61107.
Email: [email protected]
12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 2/9
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sourabh.kulkarniUser
Joined: 05 Feb 2009Posts: 8
Posted: Tue Feb 15, 2011 6:19 am
Dear Ricardo,
Thanks for the reply. There is a reason for setting the remote points
deformable. I need to include a pressure load at the interface between the
overlapping areas of the cylinder assembly. This will cause the outer
cylinder to bulge outward and inner cylinder to sag inwards near the
contact interface. If I keep the remote point definition rigid then this
behavior will not be seen. I can as well use a bonded contact between the
two bodies. In other words what I am trying to do is simulate a threaded
joint of telescopic cylinder assembly subjected to axial load that also
takes into account the effect of thread flare pressure. The ideal way of
simulating this is to include threads in the geometry. However that will
show mean high stresses in the thread geometry. I want to keep my
model simple by using the above approach and I want to keep the model
linear.
Thanks for the reply again.
Sourabh Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive, Suite A1,
Rockford, IL - 61107.
Email: [email protected]
*************************************************************
Sourabh,
your remote points' behavior is deformable. Did you set it that way on
purpose? As far as I know, the remote points are translated into
constraint equations before submitting the model to the solver: there
should be no spiderwebs of beams. The remote points act as pilot nodes
in the old Ansys jargon. Apart from the remote points' behavior, I think
your procedure is correct.
Best regards
Riccardo Testi
---
POWERTRAIN and ENGINEERING
ENGINE DESIGN and CALCULATIONS
Piaggio & C. S.p.A
Viale Rinaldo Piaggio, 25
56025 Pontedera (Pisa) - ITALY
Phone: +39 0587 272850
Fax: +39 0587 272010
Mobile: +39 339 7241918
E-mail: [email protected]
12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 3/9
-----Messaggio originale-----
Da: [email protected] [mailto:[email protected]]
Per conto di sourabh.kulkarni
Inviato: lunedì 14 febbraio 2011 20.07
Oggetto: [Xansys] Applying Constraint Equations in Workbench 12.1
Dear Ansys users,
I am working with a telescopic cylinder assembly model subjected to axial
and moment load in its extended state. The hollow cylinders overlap each
other over a length of 1" in the extended state. One end of the cylinder is
fixed and other end is free. Moment / Force is applied at the free end. My
aim is to use constraint equations to transfer load between parts instead
of contacts. The reason for this is, at a later stage there will be a pressure
load separating the overlapping areas. I have looked up help files for
Constraint Equations in Ansys 12.1 and created my model. I have outlined
my approach in the following bullet points.
* imported model in Ansys 12.1.
* deleted automatically generated contacts.
* created remote points for overlapping areas.If I understand this right
what is being done here is the areas linked to remote points are
connected by rigid elements (creating spiders).
* applied constraint equations to the two remote points in all directions.
* applied force / moment on one end and fixed the other end of the
assembly.
* solved the problem and checked for reactions.
* I have also uploaded the files (geometry + workbench cleaned file) on
"http://www.4shared.com/file/AmLnh_BQ/test.html"
It would be very helpful to know if this is an acceptable way to apply
constraint equations in ansys workbench 12.1. I wanted to make use of
the tools available in workbench.
Thanks,
Sourabh. Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive,
Rockford, IL - 61107.
Email: [email protected]
Back to top
sourabh.kulkarniUser
Joined: 05 Feb 2009
Posted: Tue Feb 15, 2011 6:20 am
Dear Riccardo,
12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 4/9
Posts: 8
Thanks for the reply. There is a reason for setting the remote points
deformable. I need to include a pressure load at the interface between the
overlapping areas of the cylinder assembly. This will cause the outer
cylinder to bulge outward and inner cylinder to sag inwards near the
contact interface. If I keep the remote point definition rigid then this
behavior will not be seen. I can as well use a bonded contact between the
two bodies. In other words what I am trying to do is simulate a threaded
joint of telescopic cylinder assembly subjected to axial load that also
takes into account the effect of thread flare pressure. The ideal way of
simulating this is to include threads in the geometry. However that will
show mean high stresses in the thread geometry. I want to keep my
model simple by using the above approach and I want to keep the model
linear.
Thanks for the reply again.
Sourabh Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive, Suite A1,
Rockford, IL - 61107.
Email: [email protected]
*************************************************************
Sourabh,
your remote points' behavior is deformable. Did you set it that way on
purpose? As far as I know, the remote points are translated into
constraint equations before submitting the model to the solver: there
should be no spiderwebs of beams. The remote points act as pilot nodes
in the old Ansys jargon. Apart from the remote points' behavior, I think
your procedure is correct.
Best regards
Riccardo Testi
---
POWERTRAIN and ENGINEERING
ENGINE DESIGN and CALCULATIONS
Piaggio & C. S.p.A
Viale Rinaldo Piaggio, 25
56025 Pontedera (Pisa) - ITALY
Phone: +39 0587 272850
Fax: +39 0587 272010
Mobile: +39 339 7241918
E-mail: [email protected]
-----Messaggio originale-----
Da: [email protected] [mailto:[email protected]]
12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 5/9
Per conto di sourabh.kulkarni
Inviato: lunedì 14 febbraio 2011 20.07
Oggetto: [Xansys] Applying Constraint Equations in Workbench 12.1
Dear Ansys users,
I am working with a telescopic cylinder assembly model subjected to axial
and moment load in its extended state. The hollow cylinders overlap each
other over a length of 1" in the extended state. One end of the cylinder is
fixed and other end is free. Moment / Force is applied at the free end. My
aim is to use constraint equations to transfer load between parts instead
of contacts. The reason for this is, at a later stage there will be a pressure
load separating the overlapping areas. I have looked up help files for
Constraint Equations in Ansys 12.1 and created my model. I have outlined
my approach in the following bullet points.
* imported model in Ansys 12.1.
* deleted automatically generated contacts.
* created remote points for overlapping areas.If I understand this right
what is being done here is the areas linked to remote points are
connected by rigid elements (creating spiders).
* applied constraint equations to the two remote points in all directions.
* applied force / moment on one end and fixed the other end of the
assembly.
* solved the problem and checked for reactions.
* I have also uploaded the files (geometry + workbench cleaned file) on
"http://www.4shared.com/file/AmLnh_BQ/test.html"
It would be very helpful to know if this is an acceptable way to apply
constraint equations in ansys workbench 12.1. I wanted to make use of
the tools available in workbench.
Thanks,
Sourabh. Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive,
Rockford, IL - 61107.
Email: [email protected]
Back to top
sourabh.kulkarniUser
Joined: 05 Feb 2009Posts: 8
Posted: Tue Feb 15, 2011 7:14 am
Dear Joseph and Riccardo,
Thanks for the replies.
Your inputs have been very helpful.
12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 6/9
Best regards,
Sourabh Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive, Suite A1,
Rockford, IL - 61107.
Email: [email protected]
***********************************************************
Sourabh,
Going back to your original post, there is no reason why you can't use
contact elements instead of CE's with pressure loads on the mating faces.
Just be careful to apply the pressures to either the underlying solids, or
the contact elements, but not both.
>My aim is to use constraint equations to transfer load between parts
>instead of contacts. The reason for this is, at a later stage there will be
>a pressure load separating the overlapping areas.
Joseph T Metrisin
Structures Lead
Florida Turbine Technologies, Inc
1701 Military Tr. Suite 110
Jupiter, FL 33458 U.S.A.
(561)427-6346 Office
(561)427-6191 Fax
Visit our new website: www.fttinc.com
FTT's public email encryption keys are stored on the FTT Verified
Directory at http://keys.fttinc.com
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12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 7/9
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Dear Ricardo,
Thanks for the reply. There is a reason for setting the remote points
deformable. I need to include a pressure load at the interface between the
overlapping areas of the cylinder assembly. This will cause the outer
cylinder to bulge outward and inner cylinder to sag inwards near the
contact interface. If I keep the remote point definition rigid then this
behavior will not be seen. I can as well use a bonded contact between the
two bodies. In other words what I am trying to do is simulate a threaded
joint of telescopic cylinder assembly subjected to axial load that also
takes into account the effect of thread flare pressure. The ideal way of
simulating this is to include threads in the geometry. However that will
show mean high stresses in the thread geometry. I want to keep my
model simple by using the above approach and I want to keep the model
linear.
Thanks for the reply again.
Sourabh Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive, Suite A1,
Rockford, IL - 61107.
Email: [email protected]
*************************************************************
Sourabh,
your remote points' behavior is deformable. Did you set it that way on
purpose? As far as I know, the remote points are translated into
constraint equations before submitting the model to the solver: there
should be no spiderwebs of beams. The remote points act as pilot nodes
in the old Ansys jargon. Apart from the remote points' behavior, I think
your procedure is correct.
Best regards
Riccardo Testi
---
POWERTRAIN and ENGINEERING
ENGINE DESIGN and CALCULATIONS
Piaggio & C. S.p.A
Viale Rinaldo Piaggio, 25
56025 Pontedera (Pisa) - ITALY
Phone: +39 0587 272850
Fax: +39 0587 272010
12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 8/9
Mobile: +39 339 7241918
E-mail: [email protected]
-----Messaggio originale-----
Da: [email protected] [mailto:[email protected]]
Per conto di sourabh.kulkarni
Inviato: lunedì 14 febbraio 2011 20.07
Oggetto: [Xansys] Applying Constraint Equations in Workbench 12.1
Dear Ansys users,
I am working with a telescopic cylinder assembly model subjected to axial
and moment load in its extended state. The hollow cylinders overlap each
other over a length of 1" in the extended state. One end of the cylinder is
fixed and other end is free. Moment / Force is applied at the free end. My
aim is to use constraint equations to transfer load between parts instead
of contacts. The reason for this is, at a later stage there will be a pressure
load separating the overlapping areas. I have looked up help files for
Constraint Equations in Ansys 12.1 and created my model. I have outlined
my approach in the following bullet points.
* imported model in Ansys 12.1.
* deleted automatically generated contacts.
* created remote points for overlapping areas.If I understand this right
what is being done here is the areas linked to remote points are
connected by rigid elements (creating spiders).
* applied constraint equations to the two remote points in all directions.
* applied force / moment on one end and fixed the other end of the
assembly.
* solved the problem and checked for reactions.
* I have also uploaded the files (geometry + workbench cleaned file) on
"http://www.4shared.com/file/AmLnh_BQ/test.html"
It would be very helpful to know if this is an acceptable way to apply
constraint equations in ansys workbench 12.1. I wanted to make use of
the tools available in workbench.
Thanks,
Sourabh. Kulkarni.
FEA Engineer.
Ingenium Technologies.
4216, Maray Drive,
Rockford, IL - 61107.
Email: [email protected]
12/23/13 XANSYS ~ View topic - Applying Constraint Equations in Workbench 12.1
www.xansys.org/forum/viewtopic.php?p=80210&sid=73260abcaac33fd072ff4648acc89d5c 9/9
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