Affiliations: [a] State Key Laboratory of Mechanical System and
Vibration, Institute of Biomedical Manufacturing and Life Quality Engineering,
Shanghai Jiao Tong University, Shanghai, China
Correspondence:
[*]
Corresponding author: Yun Luo, State Key Laboratory of
Mechanical System and Vibration, Institute of Biomedical Manufacturing and Life
Quality Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Rd.,
Shanghai 200240, China. Tel./Fax: +86 21 34206078; E-mail: luoyun@sjtu.edu.cn
Abstract: The material properties of stents change with that of deformation
due to work hardening. The whole deformation procedure of balloon expandable
stent is a typical nonlinear process. Therefore, simplified procedures were
applied in designing and optimizing stents with finite element method,
typically omitting the process of stent crimping. In fact, plastic deformation
and work hardening may occur during crimping, which may result in changes of
material properties and affect the performance of stents. In this paper a
complete deformation procedure of two typical stents was simulated using finite
element method. Their mechanical performances were evaluated and compared with
those simulations using a simplified procedure (omitting the process of stent
crimping). It was found that the work hardening caused by crimping has a
significant influence on the stress distribution, recoil rate and the maximum
expandable diameter of stent.
Keywords: Crimping, work hardening, ball expandable stent
