Formula For Calculating The Elasticity And Stiffness Of Compression Springs

The meaning represented by each term in the above formula is:
G=shear modulus of elasticity [MPa, psi] (G values are: steel wire 8000, stainless steel 7200)
D=wire diameter [mm, in]
N=effective number of turns [-]
D=center diameter [mm, in]
K=spring coefficient [N/mm, lb/in]
This formula is the calculation formula for spring stiffness, and the stiffness multiplied by the working stroke is equal to the working force of this spring.
From the above equation, we can conclude that the parameters of a compression spring must be composed of: material, wire diameter, center diameter, effective number of coils, total spring length, working height, and required force. If there are no special requirements for the strength of the spring, the working height and required strength parameters of the spring can be omitted.
It is composed of parameters such as material, wire diameter, center diameter, effective number of coils, total spring length, working height, and required force. If there are requirements for force, targeted calculation of force is required.
When the free length and stiffness of a compression spring are known, the calculation formula for a certain working length load is as follows:
P=RxF
P refers to load (pounds); R refers to spring stiffness (pounds per inch):
F is the amount of deformation from the free length.
For example, given a free length of 0.750 inches and a spring stiffness of 22 pounds per inch, and a working length of 0.500 inches, P=22x (0.750-0.500)=5.5 pounds.
2. How to Calculate Stiffness - Spring stiffness refers to the load that causes the spring to produce unit deformation, which can be tested through the following steps:
1> Measure the spring load (P1) and spring length (L1) when the spring deformation is about 20% of the larger deformation (with the free length hidden and the height removed).
2> When the spring deformation does not exceed 80% of the larger deformation, measure the spring load (P2) and spring length (L2). Be sure to ensure that any two spring coils (except for closed closures) have a spring length of L2
No contact occurred.
3> Calculate stiffness (R) (pounds per inch) R=(P2-P1)/(L1-L2)