Hello,

I am trying to create a screw joint in modal analysis (It does not allow to use screw joint in GUI directly) to represent the ball screw and its flexibility in nut interface. In ANSYS, I found out that I can use MPC184 screw joint. So I've written below code in a revolute joint APDL command in ANSYS Mechanical. (I tried this in transient analysis, this works)

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myjid=_jid

KEYOPT,myjid,1,17 ! screw joint

SECTYPE,myjid,JOINT,SCRE ! change to screw joint

SECJOINT,LSYS,9999,9999 ! coordinate systems at nodes of MPC184

SECJOINT,PITC,9e-2 ! meters per radians

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The problem is specifying the axial and torsional stiffness. I've read that APDL command in attachment can do that for a universal joint (ref: ANSYS Mechanical APDL Element Reference, 2.5.16. MPC184 Joint Material Models(TB,JOIN) ). However I was not able to do that in ANSYS Mechanical GUI for a MPC184 screw joint. Can you help me with this problem? I have axial and torsional stiffness of ball screw nut interface and I would like to define it in my MPC184 screw joint. Thanks in advance.