Water tight seal using elastic property of gasket material

[NonlinearMind]

Hello,

I have a design problem:
I want to create a water tight seal using the elastic property of the gasket material. The gasket will be stretch to fit the perimeter of a frame and the elastic force of the gasket will be used as the sealing pressure. The frame is 12" x 9" square. If the gasket has a cross-sectional area of .09in2, what should the dimensions of the gasket be when it is not stretched?
I want to use silicone with durometer of 40 +/-5. This gasket will be molded.

Thanks,

NonLinearMind

 

[1399]

Hi,

I am not sure if I understand the question correctly. Apologyse if I mistaken.

Dimension of unstretched gasket will depend on how long you want to stretch it. knowing the stretching ratio consider rubbers are incompresible in bulk (constant volume), a reasonably asumption in most cases, and calculate initial dimensions. You may be aware stress relaxation processes in tension that can limit seal life