April 28, 2018 at 8:11 ammanu87Subscriber
Hi,everyone. Here I try to couple a beam end with a cylinder(meshed with shell181), and rotate them along the longitudial axis, shown as the following picture. The end node of the beam is applied an axial compression and be rotated. The coupling between the beam and cylinder is made by the internal multipoint constraint(MPC), But, as the uncompatible freedems between beam(ux uy uz rotx roty rotz) and shell element(ux uy uz rotx roty rotz,but the freedom of rotz is fictitious) ,the cylinder cannot be rotated.So how can I make it? thanks
April 28, 2018 at 2:57 pmmauryaSubscriber
Beam is always a line element and cylinder as you mention is surface( thats why shell181 element) .
You can provide contact easily.
Attache archive file(https://studentcommunity.ansys.com/thread/saving-sharing-of-working-project-files-in-wbpz-format/) to understand the problem.
mention the version of ansys.
You used the word "rotate them" both bodies are having torque/moment ?.
May 17, 2018 at 10:12 ammanu87Subscriber
Hi manurya. Thank you for you reply. Sorry for the trouble resulting from the information I missed. As shown in the picture, the assembly is rotated only by the end of the beam.. However, due to the uncompatible freedems between beam(ux uy uz rotx roty rotz) and shell element(ux uy uz rotx roty rotz,but the freedom of rotz is fictitious), the rotional freedom is always zero when a rotational speed is applied on the end node of the beam. Do you have any idea on handling this problem?
May 17, 2018 at 9:23 pmsk_cheahSubscriber
I'm guessing the problem is with your MPC184 with KEYOPT(1)=0 (default) has only translation DOF. Here's my take with CERIG.
! Twists Cylinder made of Shells
et,1,181 ! shell181
et,2,4 ! beam4 (old)
! geometry and mesh
r = 20
L = 100
tol = 0.0001
k, 1, r, 0
k, 2, r, 120
k, 3, r, 240
k, 4, r, 360
k, 5, r, 0, L
l, 1, 2
l, 2, 3
l, 3, 4
l, 1, 5
adrag, 1, 2,3,,,, 4
mat,1 ! shells
aesize, all, 6
type, 2 ! beams at ends
! connects using cerig
cerig, nmax+1, all, all
cerig, nmax+3, all, all
!! Boundary Condition and solve
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