# Leaf Springs Calculator

Calculate Stiffness for Semi-Elliptic Laminated Leaf Spring #### K = [8 × E × n × b × t^3] / [3 × L^3] E = Youngs Modulus      n = Number of Leaves b = Width of Leaves      t = Thickness of Leaves L = Span      k = Stiffness

Youngs Modulus (E):
Nm-2
Number of Leaves (n):
Span(L):
m
Width of Leaves (b):
m
Thickness of Leaves (t):
m

Result:

Stiffness (k):
Nm-1

Calculate Stiffness for Quarter-Elliptic Laminated Leaf Spring #### K = [ E × n × b × t^3] / [6 × L^3] E = Youngs Modulus      n = Number of Leaves b = Width of Leaves      t = Thickness of Leaves L = Span      k = Stiffness

Youngs Modulus (E):
Nm-2
Number of Leaves (n):
Span(L):
m
Width of Leaves (b):
m
Thickness of Leaves (t):
m

Result:

Stiffness (k):
Nm-1

Leaf spring The leaf spring is a long circular arc spring steel with a rectangular cross section. In the most common configuration, the center of the arc provides the location of the axle, while rings formed at either end attach to the vehicle chassis. For very heavy vehicles, leaf springs can be made from multiple leaves stacked together, usually with progressively shorter leaves. Leaf springs can be used for positioning and a certain degree of damping as well as spring function. While interlayer friction provides damping, it is poorly controlled and causes stiction in the suspension's motion. For this reason, some manufacturers have started to use single-leaf springs.
The leaf springs can be attached directly to the frame at both ends, or directly at one end, usually the front end, and the other end via a shackle, short swing arm. Elasticity introduces a tendency for the blade to elongate when compressed, resulting in a softer elastic. Some springs terminate in a female end, called a spoon end (rarely used), which carries the rotating member.
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