# calculate stresses in helical compression springs.

Inputs
H1 0.4 0.4 0.4
H2 0.368 0.368 0.368
Spring Description proposed Shipped to Phillips Standard
Spring Number = 10249111 10249210 10249241
FL = Free Length (in) = 0.4375 0.5625 0.4375
k = Spring Constant (lb/in) = 5.8 2.2 2.9
SH = Solid Height (in) = 0.183 0.172 0.138
d = Wire  kendieczanesi.com Diameter (in) = 0.012 0.01 0.01
OD = Outside Diameter (in) = 0.088 0.088 0.088
G: Torsion modulus (psi) = 1.15E+07 1.15E+07 1.15E+07
Calculations
Ssy = est. torsional yeild strength (psi) = 161,783 166,147 166,147
DH = H1-H2 (in) = 0.032 0.032 0.032
FS2 (lb) per spring = 0.40 0.43 0.20
H2 (in) = 0.368 0.368 0.368
% compression at H2 = 27% 50% 23%
H1 (in) = 0.400 0.400 0.400
% compression at H1 = 15% 42% 13%
FS1 (lb) per spring at H1 = 0.22 0.36 0.11
F1 (lb) =
% diff (F2-F1)/F2 =
ratio: Deflection to Free Length = 0.16 0.35 0.16
ratio: Free Length to Mean Dia. = 5.76 7.21 5.61
No Buckling Zone(Yes/No) yes no Yes
D = mean diameter (OD-d) (in) = 0.076 0.078 0.078
C = Spring Index D/d = 6.3 7.8 7.8
K: Wahl correction factor = 1.2 1.2 1.2
tmax = max stress in wire (psi) = 55,879 101,067 47,605
N = est. no. of active coils = 11.7 13.8 10.4
FS = safety factor = Ssy/tmax = 2.9 1.6 3.5
W = weight of the spring (lb) = 0.000122 0.000102 7.76E-05
f = fundamental frequency = (hz) = 2141.628 1440.667 1899.061
no. of times greater than freq. of motion = 308 207 273
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