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shape factor of rubber pad

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Josh2015

Mechanical
Joined
Mar 10, 2015
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The definition of shape factor is the ratio of load area to the free-bulge area.

But for a complex rubber pad stack which has openess (attached), I am confused with the load area.

Can anyone help me out?

Thanks,



 
 http://files.engineering.com/getfile.aspx?folder=7841c9e3-0f1a-4b69-9ada-36807d713664&file=Shape_Factor_of_Round_Pad_Stack.pptx
Josh

I have attached a little sketch from 'Engineering Design With Natural Rubber' which explains the calculation of shape factor.
From your post it seems that you are dealing with a multi-layer (interleaved) spring.
These are essentially a set of springs in series, so the shape factor is calculated from a single layer. Assuming all the layers are identical, and the calculated stiffness of one layer is K, the the total stiffness is K/N, where N is the number of layers.

Does this help?

Tom
 
 http://files.engineering.com/getfile.aspx?folder=4b80a77f-6c67-4fcf-93e3-876b71825cd3&file=shape_factor.JPG
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