Nipping is common in automobile suspension springs
Assuming that pre-stressing results in stress- equalization,
Under the maximum force P, the deflection of graduated-length leaves will exceed the deflection of extra full length leaves by an amount equal to the initial nip C.
The initial pre-load Pi required to close the gap C between the extra full-length leaves an graduated-length leaves is determined by considering the initial deflection of leaves. Under the action of pre-load Pi