Does anyone know how to determine the effort on a node which is not on the geomtry neither on the mesh on ABAQUS ?

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Abhimanyu Kumar

What do you mean by "effort"?

Alouani Souhail

Oh sorry I mean the reaction forces (RF in ABAQUS)

If there is no boundary condition on that node then you can't get RF output at reference node. However, you might wanna check abaqus analysis manual -> constraints->multipoint constraint->linear equatin constraint