To learn contact behaviour in ANSYS apdl 16, I have modelled two 3D beam having same material and geometry property. surface-surface contact is provided by using normal stiffness factor =0.1 and friction =0. Now as stiffness of both beam is same theoretically, vertical separation should not occur. But in my case separation is occurring so What should be problem?

I have provided initially Uz and Uy constraint at one end and Uy at second end but at that time deformation in Ux direction also observed so in second model i have also provided constraint in Ux direction.

Note: I have provided linear material property and 10 division mesh in depth for both the beam. Please also see attach photos.

Thank You

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