2D hinge in compliant mechanism

Hi all,

I am trying to simulate a compliant mechanism as seen in the attached picture but I am having difficulties simulating the rotating pin in 2D. As see in the picture the structure is composed of a flexing member and two rigid members connected by a pin. I made the geometry into an assembly instead of a union, the rotating pins as rigid connectors and the rigid bars as rigid domains. My question is how to model this rotating pin, I saw an example in 3D but I am not sure how to do this in 2D. Let me know what you guys think, I appreciate your help.


Thanks

Oscar