Hello

i am trying to model simplified model of tympanic membrane. I would like to model 2D sectorial annulus membrane according to followin fig.

My goal is to find natural freq. of this membrane. The parameters i would like to use:

R1=0,5mm (inner radius)

R2=4,5mm (outer radius)

alfa=20deg

E=33MPa

Poissonous ratio = 0,3

density=1200kg/m^3

thicknes=0,1mm**T=35N/mm^2 = 35000000Pa (uniform tension in membrane)**

Firstly i used ASYS Design modeler for creating geometry. I created surface with thicknes 0,1mm

Next i defined material properties and boundary conditions in ansys mechanical (fixed inner and outer radius), however i cannot define tension. I need to set T=35MPa in order to achieve pre-stress in structural analysis and then i could go onto modal analysis.

The problem is i cannot apply pressure to edge.

How could i apply uniform tension T=35MPa to entire membrane ? (membrane is considered as prestressed)

Am I doing something worng when applying boundary condition?

Thanks