激光选区熔化成形多孔支架的有限元分析及性能研究
Finite element analysis and performance research of laser selective melting forming porous scaffolds
景鹏飞 1孔岩 2徐淑波 1孙星 1任国成1
作者信息
- 1. 山东建筑大学材料科学与工程学院,山东济南 250101
- 2. 潍坊富源增压器有限公司,山东潍坊 261206
- 折叠
摘要
人口的老龄化加剧了金属植入物的需求,广泛应用的实心支架由于"应力屏障"现象不能满足患者长期使用要求.本文通过对不同孔径及孔隙率的支架模型进行有限元数值模拟,分析得出孔隙率是影响力学性能的主要因素,随着孔隙率的增大弹性模量有明显的降低趋势.采用选择性激光熔化技术制备不同孔隙率的多孔支架,研究不同孔隙率的多孔特征及其性能,硬度测试结果显示,选择性激光熔化技术能够实现实心支架的均匀熔覆.当多孔支架的孔隙率在60％～84％时,其硬度均能满足人体骨骼的标准.热处理后,多孔支架的硬度有所提升,进而增强了其作为承重结构在人体植入部位的适用性.压缩试验的结果进一步显示,所制备的多孔不锈钢试样在受压过程中展现出了多孔材料的一些典型特性.经过对比,孔径为700 μm且孔隙率为84％的支架,在综合力学性能上与人骨达到高度契合.
Abstract
The aging of the population has intensified the demand for metallic implants,and the widely used solid stents cannot meet the requirements of long-term patient use due to the"stress barrier"phe-nomenon.In this paper,finite element numerical simulations of stent models with different pore sizes and porosities were performed,and it was analyzed that the porosity is the main factor affecting the me-chanical properties,and the modulus of elasticity decreases significantly with the increase of the porosity.Selective laser melting technology is used to prepare porous scaffolds with different porosities to study the porous characteristics of different porosities and their properties,and the hardness test results show that selective laser melting technology can realize the uniform melting of solid scaffolds.When the porosity of the porous scaffolds was in the range of 60％to 84％,the hardness of all of them could meet the standard of human bone.After heat treatment,the hardness of the porous scaffolds was in-creased,which in turn enhanced their suitability as load-bearing structures at the human implantation site.The results of the compression tests further showed that the prepared porous stainless steel speci-mens exhibited some typical properties of porous materials during compression.After comparison,the scaffold with a pore size of 700 μ m and a porosity of 84％achieves a high degree of fit with human bone in terms of comprehensive mechanical properties.
关键词
选择性激光熔化/有限元数值模拟/多孔支架/力学性能Key words
Selective laser melting/Finite element numerical simulation/Porous scaffold/Mechanical properties引用本文复制引用
基金项目
山东省自然科学基金(ZR2021ME182)
国家自然科学基金(51871136)
出版年
2024
NETL
NSTL
万方数据