3D打印的多乳酸骨架的疲劳性能,具有三次周期最小表面和沃罗诺伊孔结构
Hamed Bakhtiari1, Alireza Nouri2, Majid Tolouei-Rad1
1Centre for Advanced Materials and Manufacturing (CAMM), School of Engineering, Edith Cowan University, Joondalup, WA 6027, Australia.
Polymers
|August 10, 2024
概括
这项研究探讨了孔隙结构如何影响3D打印的聚乳酸 (PLA) 骨架. 吉罗伊德脚手架显示出最强的强度,而沃罗诺伊脚手架显示出优越的疲劳耐力,使吉罗伊德成为总体上最好的选择.
科学领域:
- 生物材料工程 生物材料工程
- 组织工程是组织工程.
- 整形外科的研究研究.
背景情况:
- 聚合物骨架对于骨再生至关重要,但它们的机械弹性,特别是疲劳行为,需要优化.
- 目前关于聚合物骨架疲劳性能的研究有限.
- 聚乳酸 (PLA) 是骨架的常见材料,但其机械性能需要进一步研究.
研究的目的:
- 研究孔隙结构对聚乳酸 (PLA) 支架的机械性能的影响.
- 为了评估不同脚手架设计的准静态和循环压缩行为.
- 为了确定骨组织工程应用的最佳支架拓.
主要方法:
- 基于挤出的3D打印被用于制造具有60%孔隙性的PLA支架.
- 脚手架使用Gyroid,Lidinoid,Fischer-Koch,IWP和Voronoi架构进行设计.
- 机械测试包括准静态和循环压缩,以评估强度和耐疲劳性.
主要成果:
- 陀螺脚手架表现出最高的压力强度 (6.6 MPa),其强度与支架厚度相关.
- 沃罗诺伊结构表现出最高的正常化疲劳性能,在85%的应变幅度下承受了大约58,000个周期.
- 疲劳性能与脚手架拓的最小截面面积有关.
结论:
- Gyroid拓提供了卓越的压力强度,这对于骨再生中的静态机械支持至关重要.
- 沃罗诺伊拓表现出增强的耐疲劳性,这对于承受周期性负荷很重要.
- 考虑到静态和疲劳性质,Gyroid拓被推为最适合用于骨架应用.
相关概念视频
01:55Bone Structure
Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
01:09Spongy Bone
All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...