Mechanical formula for the plastic limit pressure of stent during expansion

The mechanics of cardiovascular stents during the process of expansion are very important for stent function and safety. In general, finite element method (FEM) or experiments are major methods used to ascertain mechanical properties of the stent. In this paper, we develop a theoretical model of the tubular stent, derive formulas for the axial forces and moments on the stent end, and propose formulas for the plastic limit pressure vs. the stent's radius during expansion. Examples covering different geometri...