老化对PLA和PLA-X3D打印材料柔性强度的影响
Nenad Mitrović1, Zorana Golubović1, Aleksandra Mitrović2
1University of Belgrade, Faculty of Mechanical Engineering, 11000 Belgrade, Serbia.
Micromachines
|March 28, 2024
概括
这项研究表明,老化增加了PLA和增强的PLA-X3D打印生物材料的最大力. 数字图像相关性 (DIC) 分析显示,衰老会影响应变分布,这凸显了它对理解材料行为的重要性.
科学领域:
- 生物材料科学 生物材料科学
- 机械工程 机械工程
- 材料科学 材料科学 材料科学
背景情况:
- 传统上,三点曲试验提供全球机械性能数据.
- 当地菌株分布分析对于理解材料行为至关重要,特别是对于3D打印生物材料.
- 2D数字图像关联 (DIC) 是一种用于测量全场位移和应变的光学技术,提供详细的局部信息.
研究的目的:
- 分析和比较衰老对聚乳酸 (PLA) 和增强PLA-X材料机械性能的影响.
- 用DIC与三点曲试验一起研究局部应变分布.
- 评估DIC在补充3D打印生物材料的传统材料测试方法方面的有效性.
主要方法:
- 使用PLA和增强的PLA-X材料通过3D打印准备三点曲试验样本.
- 在新样本和老样本上进行三点曲试验.
- 采用二维数字图像相关性 (DIC) 来测量曲测试期间的全场应变和位移.
主要成果:
- 在PLA和PLA-X之间以及在新样本和老样本之间观察到机械性质的统计学上显著差异.
- 陈旧的PLA样本显示平均最大力增加了8.8%,而陈旧的PLA-X与新同类相比增加了7.7%.
- DIC发现,新样本通常比老样本承受更高的应变值,在5分钟的测试后出现明显的差异.
结论:
- 老化对PLA和PLA-X材料的最大力产生了积极的影响.
- DIC提供了对应变局部化和变形行为的关键见解,补充了传统的机械测试.
- 进一步了解生物力学特征对于推进这些3D打印材料的生物医学应用至关重要.
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