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Square Ring shape factor under shear

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Square Ring shape factor under shear

(OP)
Hello Guys,

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

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
SF= A/B
t= (D-d)/2
k= A*G/t

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