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Technical requirements for stainless steel corrugated expansion joints

Jan 15, 2021

The stainless steel corrugated expansion joint reduces the fatigue life in use, which can greatly improve the single wave displacement of the stainless steel corrugated expansion joint. At the same time, the comprehensive stress of the stainless steel corrugated expansion joint is also greatly improved, this will have a greater impact on the strength and stability of the stainless steel corrugated expansion joint. The comprehensive stress of the stainless steel corrugated expansion joint and its compressive strength, both reflect the strength problem. When the allowable life of the stainless steel corrugated expansion joint design is low, not only its meridional comprehensive stress is higher, but the circumferential stress is also relatively high, so that the stainless steel corrugated expansion joint will soon enter the plastic deformation, causing stainless steel corrugated expansion joints to destabilize.


For stainless steel corrugated expansion joints, displacement stress forms plastic hinges at the peaks and troughs of stainless steel corrugated expansion joints. Coupled with pressure stress, stainless steel corrugated expansion joints will quickly produce plane instability. This is the root cause of the low fatigue life stainless steel corrugated expansion joints under displacement conditions that are far lower than the high fatigue life of stainless steel corrugated expansion joints. In the pre-displacement state, that is, stainless steel corrugated expansion joint displacement for the allowable value of 1/2, an allowable fatigue life of 200 times stainless steel corrugated expansion joint, has not yet reached its allowable design pressure, has produced plane instability; Allowable fatigue life of 1000 times of stainless steel corrugated expansion joints, to reach the design pressure, stainless steel corrugated expansion joints in a flat state, reached 1.5 times the design pressure, the stainless steel corrugated expansion joint is in a critical state of instability; When the stainless steel corrugated expansion joint with a fatigue life of 2000 Times reaches the design pressure of 1.5 times, the stainless steel corrugated expansion joint is still in a stable state.

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