Installed on the outer surface of the metal wire or metal belt sleeve, although the metal hose has assumed almost all of the axial force and also with the bellows bending deformation, but because it is a flexible component, its organization is woven loose state, movement, each (strip) of metal wire or metal belt between the conditions that allow bias, so when the axial force generated by the stress is much less than its material yield, metal wire or Metal belt mesh sleeve by the impact of bending fatigue damage is also small (extrusion, wear, bump and other non-fatigue mechanical damage is not included).
The core component of metal hose bellows is a flexible part, in addition to the direct role, but also subject to bending fatigue, often in the thin-walled or thinner bellows work, when its internal stress alternating times to a certain value, may produce fatigue cracks, therefore, the key to bending fatigue damage of metal hose is the bellows.
Another kind of imbalance is the bellows due to uneven force, resulting in the bellows in relative to the circumference of the lateral displacement, the bellows overall deformation belongs to a bending state, this is called columnar imbalance. If the length of the bellows is too long, and the diameter of the bellows is too small, this case is easy to occur columnar imbalance. The column imbalance can be avoided by increasing the strength of the bellows and increasing the diameter.
As a kind of industrial piping system with multiple groups of transverse corrugations, the surface of the thin-walled axisymmetric elastic shell of the pipeline with a cylindrical shape, often used in the pipeline system displacement and thermal compensation, vibration isolation and noise reduction and media isolation. It is due to the complex variable cross-sectional geometry of corrugated pipe, under the action of fluid, making this thin-walled pipe is more likely to produce vibration deformation different from other pipes. The design of corrugated pipe, generally only consider its static load and static characteristics, resulting in the use of corrugated pipe, often caused by vibration-induced failure damage and other major economic losses.
