ENGINEERING TOOLS
Spring Calculators
Online design calculations for compression, extension, torsion, disc and leaf springs
Leaf Spring Calculator
Inputs
Results
Static safety factor at full load ≥ 1.25.
Load–deflection
Equivalent trapezoidal plate method: each side as a cantilever, δ = K·4PL³/(E·n·b·h³), σ = 6PL/(n·b·h²), P = W/2 per side for symmetric springs; K = 3/(1−η)³·[1/2 − 2η + η²(3/2 − ln η)]. Deduct half the U-bolt clamp length from L. Inter-leaf friction, eyes and pre-stress are ignored. For preliminary estimates only.
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View related products →Formulas
Shape factor
K = 3/(1−η)³·[1/2 − 2η + η²(3/2 − ln η)]
η = n′/n; K = 1.5 at η→0, 1 at η = 1
Deflection
δ = K·4PL³ / (E·n·b·h³)
Each side as a cantilever, P = W/2
Rate
c = W / δ
Centre load over centre deflection
Root stress
σ = 6PL / (n·b·h²)
Compared with yield strength
Frequency
f = (1/2π)·√(g/δ)
From static deflection at full load
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