关节变形对3D打印聚烯结构的辅助性行为的影响
Juliet A Shepherd1, Serena M Best1, Ruth E Cameron1
1Cambridge Centre for Medical Materials, Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK.
Journal of the mechanical behavior of biomedical materials
|February 24, 2025
概括
这项研究研究了用于软机器人和组织工程的3D打印聚烯辅助性网格. 研究人员发现了一个定义的辅助性区域,其中保持恒定的负波桑比率,这对于细胞伸展装置应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 生物医学工程 生物医学工程
背景情况:
- 传统的辅助性结构使用刚性金属,限制了它们在组织工程等软应用中的使用.
- 软辅助剂正在获得吸引力,需要对其机械行为和Poisson比率进行研究.
- 聚合物辅助剂需要特别研究,因为它们的特性与金属对应物不同.
研究的目的:
- 为了研究3D打印的聚烯辅性网状结构的变形力学和Poisson比.
- 为了评估这些软辅助性网格对于生物细胞伸展装置的适用性.
- 描述关节行为对聚合物网格辅助性质的影响.
主要方法:
- 制造3D打印的聚烯辅性网状结构,具有不同的回入支架角 (30°,45°,60°).
- 拉伸测试以获得力-拉伸曲线并描述变形力学.
- 高清成像用于观察拉伸负荷期间的结构行为.
- 单独的单元细胞和全尺寸网格样本的分析.
主要成果:
- 强力-应变曲线表现出三个不同的阶段:线性,平原和终端,这与蜂巢结构的典型特征有关.
- 一个恒定的负波桑比率被观察到到一个关键的过渡应变,归因于曲和外平面变形.
- 对于跨越不同几何形状的全尺寸网格,发现了一致的临界过渡应变和Poisson比值.
- 定义了一个辅助性应变区域,其特点是线性力响应和稳定的负波桑比率.
结论:
- 该研究为3D打印的聚烯网格定义了一个可操作的辅助性应变区域.
- 这一定义区域对于这些网格在生物细胞伸展装置中的成功应用至关重要.
- 这些发现为高级应用提供了软聚合物辅助性材料的机械行为提供了宝贵的见解.
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