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General Principles
Nomenclature
Contact pressure
p
in
N/mm
2
Axial
ring width
h
in
mm
Bending moment
M
in
N/mm
Diametral force
F
d
in
N
Closure stress
σ
b
in
N/mm
2
Modulus of elasticity
E
in
N/mm
2
Spring force
in
N
Conformability
U
in
mm
Gas pressure
p
z
in
N/mm
2
Piston ring parameter
k
-
Radius of curvature of the open ring (ring in
free
state)
ρ
1
in
mm
Radius of curvature of the closed ring (ring at
nominal diameter
)
ρ
2
in
mm
Inertia force
in
N
Total
free
gap
m
in
mm
Nominal diameter
d
in
mm
Ovality
u
in
mm
Radial
wall thickness
a
in
mm
Radius at outside diameter
r
in
mm
Radius of ring centre line
r
m
in
mm
Friction force
in
N
Closed gap
s
in
mm
Tangential force
F
t
in
N
Moment of inertia
l
in
mm
4
Assembly stress: tangential
opening
σ
büT
in
N/mm
2
Assembly stress:
opening
by means of a
sleeve
σ
büH
in
N/mm
2
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