软材料在3D打印中的低剪速摩擦的分析模型
Sasa Njezic1,2, Fatima Zivic2, Slobodan Savic2
1Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina.
概括
一个新的数学模型准确地预测了3D打印弹性聚合物中的接触应力和摩擦. 该模型使用有限可伸缩非线性弹性 (FENE) 模型,有助于优化打印参数,以提高软材料的尺寸精度.
科学领域:
- 材料科学 材料科学 材料科学
- 生物医学工程 生物医学工程
- 类风病学 类风病学 类风病学
背景情况:
- 像聚二甲基 (PDMS) 这样的弹性体在生物医学中非常重要,因为它们的生物相容性,用于植入物和医疗器械.
- 软材料的增材制造为创建定制医疗设备和组织工程支架带来了挑战.
研究的目的:
- 开发一种数学模型,用于预测3D打印中使用的非牛顿凝和流体的接触应力.
- 分析切削应力,切削速率,3D打印压力和软材料中的速度之间的关系.
主要方法:
- 利用有限可扩展的非线性弹性 (FENE) 模型来定义触线应力,速度和压力之间的依赖关系.
- 使用立体石刻 (SLA) 和沉积建模 (FDM) 3D打印技术制造的实验样品.
- 采用Maple软件进行实验3D打印参数的数值建模和分析.
主要成果:
- 分析模型应用于低切割速率的印刷弹性聚合物,在0.91.2毫米/秒的印刷速度下,产生了0.2080.216N/m2的接触应力值.
- 观察到较低的摩擦系数 (0.090.16),与现有的文献数据保持一致.
- 发现打印压力对触角应力影响最小,而剪切率则略有影响;摩擦系数随着触角应力线性增加.
结论:
- 在SLA 3D打印中开发的弹性聚合物的分析摩擦模型与低剪速的实验数据有很好的一致性.
- 该模型显示了预测3D打印参数的潜力,以在打印对象中实现所需的尺寸精度.
- 未来的工作应该将该模型扩展到其他切割速率制度,软材料和打印参数.
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