In Leaf spring, the stresses in extra full-length leaves are 50 % more than that of in graduated leaves.
It is important to equalize the stresses in all the leaves on leaf spring.
One of the method of equalizing the stresses is to pre-stress the spring.
This can be done by bending the leaves to different radii of curvature before the assembly.
The full length leaf is given with greater radius of curvature than the adjacent graduated leaves. The shorter leaves are given with smaller radius of curvature than the previous leaves.
The initial gap formed between the extra full length leaf and graduated leaf before the assembly called a ‘nip’.
A difference in radius of curvature is made for such pre-stressing is known as ‘nipping’.
It is important to equalize the stresses in all the leaves on leaf spring.
One of the method of equalizing the stresses is to pre-stress the spring.
This can be done by bending the leaves to different radii of curvature before the assembly.
The full length leaf is given with greater radius of curvature than the adjacent graduated leaves. The shorter leaves are given with smaller radius of curvature than the previous leaves.
The initial gap formed between the extra full length leaf and graduated leaf before the assembly called a ‘nip’.
A difference in radius of curvature is made for such pre-stressing is known as ‘nipping’.
Note;
The leaves are held together by using two U bolts and a center clip.
To keep the leaves in alignment, rebound clips are also provided in order to prevent lateral shifting of leaves.
These springs are used in railway wagons, cars, trucks etc..
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