They are excellent for absorbing vibration and multi-directional movement, especially in high-pressure or nuclear environments.
In engineering, bellows are convoluted shells that compress or extend to handle pressure or thermal expansion in piping systems.
Essential for modern piping, but they require strict adherence to ASME/EJMA standards to prevent catastrophic instability. Design and analysis aspect of metal expansion bellows
They are susceptible to "squirm" (buckling) if internal pressure exceeds design limits. Corrosion near welding points is also a common failure point.
Multi-ply designs offer a better fatigue life than single-ply versions.