Mechanical Behavior of Hinge Lozenge Grid Structure

7th Annual International Conference on Materials Science and Engineering

Li, Zhong^1 ; Wang, Shuai^2 ; Zhou, Kaifa^1 ; Tan, Qianwen^1 ; Feng, Huolei^1

School of Civil Engineering, Chongqing Jiaotong University^1

College of Intelligent Manufacturing, Chongqing Vocational College of Transportation, 66 Xuefu Avenue, Nanan District, Chongqing, China^2

关键词: Axial elongation;    Axial expansion;    Design and optimization;    Grid structures;    Inflation process;    Intravascular stents;    Mechanical behavior;    Spring-back;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012131/pdf
DOI  :  10.1088/1757-899X/562/1/012131

来源: IOP

【 摘 要 】

There are two phenomena in the inflation process of the existing stent, dogboning and axial expansion, which will shorten the life of the stent and lead to the failure of stenting. Firstly, The hinge lozenge grid structure with negative Possion's ratio was reported. Secondly, the process of inflation and springback of stent were simulated based on finite element method in order to analyse its expansion, axial expansion ratio and resilience rate. It is demonstrated that hinge lozenge grid structure with symmetrical deformation exhibits "full-scale expansion" structural properties. Besides, the diameter of inflated stent is twice as much as initial after expansion. Also, it shows axial elongation as well as increasing axial expansion ratio. The displacement changes obviously with the increase of pressure with other conditions unchanged. This new structure not only improves the radial support performance of intravascular stents significantly, but also overcomes the shortage of traditional stents, which provides a new idea for the design and optimization of intravascular stents.