Ashish Khemka
Forum Moderator
Hi,
 
The stiffness about a hinge joint local x axis can be defined, as shown in Figure 2.
 
Please check if there is any rotation response about the global Y and/or global Z axis. If yes, the joint force about global x axis (in Figure 3) could be non-zero, as the hinge joint local x axis does no longer parallel to the global X axis.
 
Regards,
Ashish Khemka