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

# Need for the coupling of beam and shell co-rotation

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Hello Manu

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 ?.

regards

Deepak

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?

Regards

manu

I'm guessing the problem is with your MPC184 with KEYOPT(1)=0 (default) has only translation DOF. Here's my take with CERIG.

Kind regards,

Jason

! Twists Cylinder made of Shells /prep7 et,1,181 ! shell181 et,2,4 ! beam4 (old) mp,ex,1,210e3 mp,nuxy,1,0.3 r,1,0.01 r,2,100,40,40 ! geometry and mesh r = 20 L = 100 tol = 0.0001 csys, 1 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 csys, 0 mat,1 ! shells type,1 real,1 mshkey,1 aesize, all, 6 alls amesh,all type, 2 ! beams at ends real, 2 *get,nmax,node,0,num,max n,nmax+1,0,0,0 n,nmax+2,0,0,-L n,nmax+3,0,0,L n,nmax+4,0,0,2*L e,nmax+1, nmax+2 e,nmax+3, nmax+4 ! connects using cerig alls nsel,s,loc,z,0-tol,0+tol cerig, nmax+1, all, all nsel,s,loc,z,L-tol,L+tol cerig, nmax+3, all, all !! Boundary Condition and solve /solu alls antype, static d,nmax+2,all,0 d,nmax+4,rotz, 0.01 solve

/post1

set,last

plnsol,rot,z

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