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Theoretical Relationships
Closure Stress

The closure stress σb is a measure of the stress present in the ring when installed in the cylinder. For a ring of rectangular cross section σb is stated in terms of the total free gap m by

(6)

and in terms of the tangential force by
(7)



For a slotted oil control ring σb is expressed in terms of the total free gap m by

(8)

and in terms of the tangential force by
(9)



lu = moment of inertia of the unslotted cross section
ls = moment of inertia of the slotted cross section
x1 = twice the distance between centre of gravity and outside diameter
k = piston ring parameter

 
 

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