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Square Ring shape factor under shear

Square Ring shape factor under shear

Square Ring shape factor under shear

Hello Guys,

Please let me know if shape factor and shear stifness calculation below is correct for attached rubber design.
Thank you.

A=Load area
B=Bulged area
D=Outside dia.
d=inside dia.
L=Thickness of rubber
t=Undeformed thickness
k=dynamic shear stiffness
G=dynamic shear modulus

A= pi*(D+d)*L
B= pi*D*L
t= (D-d)/2
k= A*G/t

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