Mathematical description and mechanical characteristics of reinforced S-shaped bellows

摘要

The reinforced S-shaped bellows, which can withstand high pressure, is a kind of typical metal bellows. A mathematical description of the structural configuration of bellows and reinforced hoop was put forward in the present study. Mechanical characteristics of the reinforced S-shaped bellows under internal pressure, forced axial and bending displacement were discussed. The ultimate pressure bearing capability of the bellows decreases slightly with the increase of the number of layers, but the decrease is limited. Axial tensile rigidity of the reinforced S-shaped bellows tends to have weak nonlinear characteristics. It can be demarcated two states by whether the stress reaches yield strength, defined as high and low rigidity respectively. Bending characteristics of the reinforced S-shaped bellows shall be analyzed based on theoretical and numerical simulation analysis, respectively. The bending rigidity is affected by material nonlinearity and fitting extent of local wave. It is directly related to the mechanical characteristics of axial torsion and compression.