What is the stiffness of the bellows?

The load value required for the unit displacement of the metal bellows or other elastic elements is called the stiffness of the element, which is generally represented by "K". If the elastic properties of the element are nonlinear, the stiffness is no longer constant, but varies with increasing load. For general engineering bellows-like elastic elements, the stiffness tolerance can be limited to within  /-50%. The stiffness of the bellows is divided into axial stiffness, bending stiffness, torsional stiffness, etc. according to the nature of the load and displacement. In the application of bellows, most of the stress is axial load, and the displacement mode is linear displacement.