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凝水凝中的裂纹传播和阻断与尖端曲率有关

Anshul Shrivastava¹, Supreeth M¹, Namrata Gundiah¹

¹Biomechanics Laboratory, Department of Mechanical Engineering Indian Institute of Science, Bangalore, India. namrata@iisc.ac.in.

|September 1, 2023

概括

甲基醇 (MGO) 交联的凝水凝通过增加裂纹停止事件,提高了85%的断裂性. 这项研究将裂纹生长与尖端曲率联系起来,为开发更坚固的生物材料提供了洞察力,用于组织工程.

科学领域:

生物材料科学生物材料科学
组织工程是组织工程.
材料科学材料科学材料科学

背景情况:

由于对细胞友好的特性,凝水凝对组织工程具有前景.
然而,由于它们的低性和易碎,限制了承重应用.
了解裂纹传播对于改善水凝骨折阻力至关重要.

研究的目的:

研究凝水凝中的裂纹尖端过程和传播机制.
为了将断裂特性与材料微观结构和交联密度相关联.
开发更坚固的基于凝的水凝,以提高机械性能.

主要方法:

使用谷氨和甲基酸 (MGO) 制造具有不同交叉连接密度的凝水凝.
纯剪切切口测试以量化断裂行为和裂传播.
2D数字图像相关性,以表征裂纹尖端附近的应变场.
泰勒系列扩展用于精确测量裂尖曲率.

主要成果:

与对照组相比,MGO水凝表现出85%的增强折裂性.
在两个水凝组中都观察到频繁的裂停产和停产.
停滞后的裂启动与较低的裂尖曲线相关.
机械拉伸化裂纹尖端,独立于交叉链密度.

结论:

在交叉连接的凝水凝中,裂纹生长,尖端曲率和断裂性之间存在直接联系.
增加与MGO的交叉链接通过促进破解逮捕来提高性.
这些发现为设计用于组织工程的强大的水凝支架提供了洞察力.

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