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Theoretical Relationships
Diametral Force

Calculations are sometimes also performed based on the diametral force Fd. This is the force acting diametrically at 90° to the gap that is necessary to compress the ring to its nominal diameter. The following relationship between the diametral and tangential force has been established for the different piston ring materials based on empirical values:

Fd = 2,05 Ft for heat treated and non heat treated cast iron materials (5)

Fd = 2,15 Ft for spheroidal graphite cast irons

(see GOE 504, P. 120)

The exact mathematical correlation is

k = piston ring parameter

u = ovality

The maximum error using the practical form (5) of the equation is 5% and may be disregarded.


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