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July 31, 2024 at 3:29 pm
Alex R.
Ansys Employee

Hello,

*CONSTRAINED_JOIN_* requires that the nodal points within the nodal pairs used to define the joint (1, 2), (3, 4), and (5, 6) should coincide in the initial configuration. Please see Figures 10-16 through 10-22 in Keywords User manual I. 

https://lsdyna.ansys.com/manuals/

E.g., revolute joint

 

Example: https://www.dynaexamples.com/introduction/examples-manual/constrained/joint-1

Example II: https://www.dynaexamples.com/introduction/examples-manual/constrained/joint-ii

Thanks,
Alex