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Theoretical Relationships
Tangential Force

The tangential force is usually measured with the aid of a flexible tensioning tape which encloses the ring and compresses it to closed gap. (For commercially sized rings the friction effects can be ignored.) The tangential force Ft therefore acts at the periphery of the ring. By substituting in (3) the ring diameter d for the radius r the pressure that the ring exerts radially outwards against the cylinder wall is stated by:

The contact pressure of compression rings on account of their inherent tension generally lies between 0.12 and 0.25 N/mm2 for rings conforming to DIN/ISO standard. The actual contact pressure is many times greater due to the gas pressure acting behind the ring.


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