Learning Forum

[freud farid]

i need to validate this benchmark "Large deflection of curved cantibver under nonconservative tangential end load" , as show in image bellow , the force R is nonconservative load that mean the force R remains normal to the mid-axis of the beam during deformation

i need way to apply this kind of force in ansys ? 

[peteroznewman]

Here is the Ansys Help entry: 

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/ans_elem/Hlp_E_FOLLW201.html

Here is an old discussion:

/forum/forums/topic/how-to-setup-a-follower-force-for-a-cantilever-beam/

[freud farid]

this link not open 

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/ans_elem/Hlp_E_FOLLW201.html

for the discussion , i have already read it , unfortunately It is useless

There will remain a problem that needs to be answered by Ansys

[Erik Kostson]

 

Hi By default, Mechanical uses FOLLW201 element to apply a force to a BEAM element.

Thus, follower effects are considered.

All the best

Erik

 

[peteroznewman]

First open Ansys Help.

Copy the URL above and paste it into the Address bar of the browser showing Ansys Help.

It will open.

[freud farid]

hi Erik Kostson

how you get this information in image ? How can I access to switch between elements availables 

how i can choose or apply  follw201 element ?

but I don't get the same results as reference and analytical result

[Erik Kostson]

Hi

 

Q: how you get this information in image ?

Go to Solution in the mechaniacl tree, right mouse button click and choose Worksheet Res. Summary (see below).

Q: how i can choose or apply  follw201 element ?

As I said when we apply a force in mechanical on a line body (which is meshed with beam elements), automatically the follw201 elements are created by Mechanical and used, hence follower effects are considered.

All the best

 

Erik

[freud farid]

It still gives me either  beam188 when i use line sketch or solid186 when i use solid

I don't know where the problem is ? 

i find extension in site  for applaying 'follower load' but i didn't know how to apply it
How do I contact you privately?

[peteroznewman]

I tried a standard force applied to a beam 188 mesh, but the follower force is not created by default as can be seen by the Reaction Force.

I used the Follower Force ACT to create a Follower Force. The Force Reaction shows that it is working.

[Erik Kostson]

 

 

It is because the native force object inside mech., that generates the folw201 elements in the ds.dat file, uses keyoption(1)=1 – so not to update the direction.

We need a command to activate the update direction (below the type id is 2 for the follw201 element and typed id 1 for beam188):

All the best

Erik

 

 

 

[freud farid]

Erik 

can you share in detail steps to do that ? i need to do this example in follower force for my master project , I desperately need help

[peteroznewman]

Erik, I see what your original point was now that I opened the ds.dat input file and found an element type 201 for the follower element and the keyop,3,1,1 to keep the direction from changing!

/com,*********** Create Remote Point "Remote Force - Remote Point" ***********
*set,_npilot,74
_npilot50=_npilot
et,2,170
type,2
real,2
mat,2
keyo,2,2,1              ! don't fix pilot node
keyo,2,4,111111
tshape,pilo
en,38,74        ! create pilot node for rigid link
tshape
en,39,74,1
/com,*********** Define Vertex Force Using Follower Elements ***********
et,3,201
keyo,3,1,1           ! Keep the direction constant
keyo,3,2,1           ! Apply Forces only, not moment
mat,3
real,3
type,3
en,40,1
r,3
rmod,3,1,1.0,              ! FX
mat,4
real,4
type,3
en,41,1
r,4
rmod,4,2,1.0,              ! FY
mat,5
real,5
type,3
en,42,1
r,5
rmod,5,3,1.0,              ! FZ
/gst,on,on
fini

In this model, the type ID for the FOLLW201 element is 3 so the Keyops are as shown below.

Thank you for the help Erik!

[freud farid]

thank you for sharing the code , but when i use it not work and give error

please can you share the result of y displacement ?

can you show the detail by image how to apply follower load in example above ?

thank you 

[Erik Kostson]

All the best Peter.

Erik