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# spring rate thickness vs deflection

## spring rate thickness vs deflection

(OP)
Dear All,

I have doubt in calculating the spring rate of rubber . I got formula for spring rate K= F/D = AE/t

Using the above mentioned formula I calculated the thickness and deflection of rubber . But I am not getting it right?

If anyone have a right formula to find the deflection and thickness of viton rubber please guide me to proceed in the right way.

It would be really grateful for me.

with regards,

J.Mohanraj

### RE: spring rate thickness vs deflection

Rubber is a bit odd. Your equation will work for long thin rods of rubber in tension, but won't work for short fat blocks in compression between two flat faces. There are several books around called engineering with rubber or similar, they should have appropriate equations/graphs.

Cheers

Greg Locock

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### RE: spring rate thickness vs deflection

There has been much information disseminated on elastomeric properties in engineering periodicals and engineering handbooks.

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