中国组织工程研究

中国组织工程研究 ›› 2010, Vol. 14 ›› Issue (38): 7133-7135.doi: 10.3969/j.issn.1673-8225.2010.38.025

• 材料力学及表面改性 material mechanics and surface modification • 上一篇    下一篇

不同截面和尺寸镁合金支架扩张过程中的应力变化

齐  民，司超阳，王伟强   

  1. 大连理工大学材料科学与工程学院，辽宁省大连市 116024
  • 出版日期:2010-09-17 发布日期:2010-09-17
  • 作者简介:齐民☆，男，1960年生，辽宁省大连市人，汉族，1994年大连理工大学毕业，博士，教授，主要从事生物医用材料及评价方面的研究。 minqi@dlut.edu.cn

Stress change during the expanding process of magnesium alloy stents with different strut shapes and sizes

Qi Min, Si Chao-yang, Wang Wei-qiang   

  1. School of Materials Science and Engineering, Dalian University of Technology, Dalian   116024, Liaoning Province, China
  • Online:2010-09-17 Published:2010-09-17
  • About author:Qi Min☆, Doctor, Professor, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China minqi@dlut.edu.cn

PDF

339

被引次数

17

摘要：

背景：降解带来的一个重要变化是支架尺寸的减小，从而影响支架的支撑力。由于支架的结构复杂性，导致其应力分布的复杂性。
目的：分析不同截面形状和尺寸的镁合金支架在扩张过程中的应力变化。
方法：利用有限元法分别计算正方形、八边形、圆形3种筋截面形状的镁合金支架扩张过程中主要受力部位的残余应力，同时计算120，140，160，180 μm的4种不同尺寸下该处残余应力的变化情况。
结果与结论：正方形、八边形、圆形这3种不同筋截面形状支架扩张后，圆形筋截面形状支架上主要受力部位的应力最大。对3种支架而言，随着筋截面尺寸的减小，该部位的应力减小，提示支架筋截面形状及尺寸均对支架扩张后的残余应力产生影响。

关键词: 应力, 有限元法, 截面形状, 镁合金支架, 材料力学, 生物材料

Abstract:

BACKGROUND: An important change of the degradation is the decreased size of the stents, thus affecting its support force. Due to the complexity of stent structure, stress distribution becomes complicated.
OBJECTIVE: To analyze the stress change generated during the expansion of magnesium alloy stents at various strut shape and size.
METHODS: Residual stress generated during the expanding process on cross-section stents with square, octagonal and circular strut was calculated by finite element method. Meanwhile, residual stress of different strut cross-section sizes (120, 140, 160,  180 μm) was also calculated. 
RESULTS AND CONCLUSION: After the stent expanded, the stress generated in circular strut cross-section was the maximium, as for three kinds of stents, the stress decreased with the decline of cross-section size. Strut cross-section shape and size both have an effect on the residual stress generated during expanding process.

中图分类号: