Compression Spring Calculation : 2

Spring Load :
Minimum Working Force F1 = 10 N
Maximum Working Force F8 = 160 N

Spring Dimensions :
Loose Spring Length L0 = 25.2 mm
Wire Diameter d = 2.8 mm
Outside Diameter D1 = 16.212 mm
Mean Diameter D = 10.612 mm
Inside Diameter D2 = 13.412 mm
Spring Index c = 4.79

Spring Coils :
End Coils nz = 2
Ground Coils zo = 2
Number of Active Coils n = 5
Coiling Direction - right

Spring Type and Assembly Dimensions :
Guided mounting - parallel ground ends
Preloaded Spring Length L1 = 25 mm
Fully Loaded Spring Length L8 = 22 mm
Working Stroke H = 3 mm


Spring Material :
Heat treated wire carbon steel
Ultimate Tensile Stress = 1450 MPa
Allowable Torsional Stress = 870 MPa
Modulus of Elasticity in Shear = 78500 MPa
Density = 7850 kg/m3
Utilization Factor of Material us = 0.9

Fatigue Loading :
Non shot-peened spring
Spring Life in Thousands of Deflections N > 10000
Safety Factor kf = 1.2

Calculation Results :
Space between Coils of Free Spring a = 4.48 mm
Pitch of Free Spring t = 1.68 mm
Wahl Correction Factor Kw = 1.326
Spring Constant k = 49.999 N/mm
Preloaded Spring Deflection s1 = 0.2 mm
Total Spring Deflection s8 = 3.2 mm
Limit Spring Deflection s9 = 8.4 mm
Working Spring Deflection = 12.7 %
Maximum Allowable Spring Deflection = 70.2 %
Limit Test Length of Spring Lminf = 21 mm
Theoretic Limit Length of Spring L9 = 16.8 mm
Spring Limit Force F9 = 419.99 N
Endurance Limit in Shear = 437.95 MPa
Preload Stress Tau1 = 20.63 MPa
Full Load Stress Tau8 = 330.15 MPa
Solid Length Stress Tau9 = 866.63 MPa
Critical Speed of Spring v = 15.28 m/s
Natural Frequency of Spring Surge f = 1107.9 Hz
Deformation Energy W8 = 0.256 J
Wire Length l = 300.4 mm
Spring Mass m = 0.015 kg

Spring Check Result - True