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About spring properties

Spring properties are one of the features of bellows. Spring properties determine a good part of product shape. Terminology related to the spring properties are shown.

About spring properties

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Name Description
Axial direction
spring constant
Load required for 1mm displacement in an axial direction,
showing an almost constant value load elasticity regions, while changing when
the pulling force tends toward plastic deformation with a large displacement
or where corrugations interfere near adhesion;
mostly used in an almost constant range, while being used under interference
depending on specification conditions.
(On bellows, the axial direction spring constant decreases in the following
cases: small thickness, large span, many threads, etc.)
Perpendicular-to-an-axis
direction spring constant
Load required for 1mm displacement in a perpendicular-to-an-axis direction,
decreasing with increasing face-to-face dimension in proportion to the axial
direction spring constant.

Meandering and buckling
Flexion of bellows by application of a contraction side force from internal
pressure or unrestricted length.
The pressure at which buckling occurs varies according to the spring constant,
bellows length, etc.
Meandering --- The deformation, which is apparent curvedness, is restored by
removing the load.
Buckling --- The deformation, which is advanced meandering, is not restored
even when the load is removed.
Normally, a design is made in a buckling-free range, but if it cannot be
absorbed by one block, support is provided by intermediate fittings as another
multiblock structure.
Natural frequency Bellows also have a natural frequency that is detected when subjected to free
vibration.
If a resonance phenomenon occurs, an unpredictable load is applied to the
bellows, which can cause premature damage.

Glossary of bellows terms

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