The residual deformation of metal bellows and other elastic elements refers to the displacement of the element after loading and the failure of the elastic element to return to its original position after unloading for a considerable period of time. A residual value that produces a residual deformation. The residual deformation of the element is related to the service state. When the tension or compression displacement gradually increases to a certain value, the residual deformation will increase significantly.

Residual deformation is a parameter to determine the deformation capacity of elastic elements. For elastic sensitive elements, if a large residual displacement occurs after reaching the rated displacement value, it will affect the measuring accuracy of the instrument. So. In general, some limits are given for residual deformation. The bellows components used in engineering sometimes have large residual deformation in the elastic-plastic zone in order to get larger displacement. If can satisfy certain service life and do not become invalid. The residual deformation quantity is no longer considered.

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