MIL-DTL-27426C
6.3 DESIGN INFORMATION
a.
Definitions:
1)
A = Shaft or housing diameter (in)
2)
C = Groove diameter (in)
3)
C1 = Percent change of ring diameter from free state to installed state/100.
4)
D = Groove width (in)
5)
Dg = Permanent groove deformation (in)
6)
Dn = Free neutral ring diameter (in)
7)
D1 = Depth of groove (in)
8)
E = Ring radial wall (in)
9)
F = Ring thickness (in)
10)
G = Ring free O. D. or I. D. (in)
I = Moment of inertia T 1E3/12 (in4)
11)
12)
K = Factor of safety (K=2 based on groove yield, K=3 based on ring shear)
13)
L = Number of turns of ring
14)
M = Modulus of elasticity ( psi)
15)
N = Speed (rpm)
16)
Ps = Allowable thrust load based on shear strength of material ( lbs)
17)
Pt = Thrust load ( lbs)
18)
Rg = Groove radius (in)
19)
Ri = Free inside ring radius (in)
20)
Rn = Dn/2 = Free neutral ring radius (in)
21)
Ro = Free outside ring radius (in)
22)
S = Installation stress ( psi)
23)
Sc = Shear strength of groove material ( psi)
24)
Ss = Shear strength of ring material ( psi)
25)
Sy = Compressive yield strength of groove material ( psi)
26)
T1 = Material thickness (in)
27)
Y = Distance of groove from end of shaft or housing (in)
σ = Allowable working stress ( psi)
28)
φ = Allowable angle of deflection ( deg)
29)
t1 = .019 (Frequency factor for 1 st harmonic)
30)
t2 = .032 (Frequency factor for 2 nd harmonic)
31)
γ
= Specific weight of material (lbs/in 3)
32)
b. Allowable thrust load capacity of the rings can be found with the equation
shown below. The value determined by this equation is valid under the following
conditions: 1) square corners at retained part and groove, 2) minimum clearance
between retained part and shaft/housing, 3) static loading conditions.
Allowable thrust based on shear strength of ring material, lbs.
Shaft or housing diameter, in.
Ring thickness, in.
Shear strength, psi
š
Ps = A
F
Ss
K
Factor of Safety
11
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