MIL-DTL-27426C
To calculate allowable deflection of the ring the equations are:
For Internal Rings
Ring deflection, degrees
Mean groove radius, in.
Allowable working stress, psi
Ring cling to groove bottom
Ring modulus of elasticity, psi
Ring radial wall, in
φ= 114.6
σ +
Rg
C1
M
E
(1-C 1)
Dn
L
M
T1
Number of
Ring free
Mean ring
turns of
neutral
material
ring
diameter, in.
thickness,
in.
Min. ring free O. D., in.
Mean groove diameter, in.
Where C1 = G - C
G
Dn = G - E
Rg = C
2
(For the above equations, use the calculated value of φ if φ is below 18°.
If φ is
equal to or greater than 18 °, use 18°.)
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