×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Newbie: how to make a radial restraint

Newbie: how to make a radial restraint

Newbie: how to make a radial restraint

(OP)
Hello!

I am starting to learn ANSYS and I'd like to ask for some help. Consider a plate with a hole (see code below).

Please, can you explain me how to create a radial restraint for the hole (that is, the plate can only rotate about the axis of the hole)?

Thank you very much!


/prep7
/title,Plate

l1 = 80.0E-3
l2 = 250.0E-3
l3 = 50.0E-3
a  = 20.0E-3
b  = 15.0E-3
th = 20.0E-3

ET,1,SHELL63
R,1,th,th,th,th
MP,EX,1,2.0E11
MP,PRXY,1,0.3

TYPE,1
REAL,1
MAT,1

BLC4,0,0,l1,l2

CYL4,l1/2,l3/2,5.0E-3
ASBA,1,2

FINISH

RE: Newbie: how to make a radial restraint

Hi

You can determine your boundary conditions by applying your displacements on the lines of the hole.

Grtz Garry

RE: Newbie: how to make a radial restraint

(OP)
You say zero to displacements at all nodes of the boundary of the hole?
If I do it, the plate won't be able to rotate.

RE: Newbie: how to make a radial restraint

set up a locale cylindarical coordinate at the hole senter. Then applied constraint along the radial direction.

RE: Newbie: how to make a radial restraint

EricZhao,

what you said is not complete. Independent of the active coordinate system, the nodal displacements are in the nodal coordinate system. So:

1) set up a locale cylindarical coordinate at the hole center:

CODE

local,1000,1,xcenter,ycenter,zcenter

2) select nodes on the circle:

CODE

nsel,s,loc,x,rad

3) Rotate nodal coordinate sistems in the cylindrical coordinate system:

CODE

nrotat,all

4) constrain nodes along the radial direction:

CODE

d,all,ux,0

RE: Newbie: how to make a radial restraint

Jolilechat,


in your concrete case:

CODE

smrtsize,4
amesh,all
local,1000,1,l1/2,l3/2
nsel,s,loc,x,5e-3
nrotat,all
d,all,ux,0
/PBC,U,,1
nplot

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources