相关实验视频
Updated: Jun 16, 2025

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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
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在较大的变形下,软异型材料的普森函数和体积比在很大变形下
1Laboratory of Opto-Mechanics (LOM), Department of Mechanical Engineering (PGMEC-TEM), Universidade Federal Fluminense - UFF, Rua Passo da Pátria, 156, Bloco E, Sala 210, Niterói, RJ, CEP 24210-240, Brazil.
Journal of the mechanical behavior of biomedical materials
|August 17, 2024
概括
这项研究引入了一种用于测量软材料横向变形的新方法,这对于理解Poisson的理解至关重要.
科学领域:
- 材料科学与工程 材料科学与工程
- 生物力学 生物力学
- 固体力学 固体力学是什么
背景情况:
- 精确的横向变形测量对于确定材料特性,如波桑比率和体积变化至关重要,特别是在经历大变形的软材料中.
- 传统方法可能容易产生测量错误,影响衍生参数的可靠性.
- 了解软材料的机械行为,包括生物组织和工程弹性体,对于各种应用至关重要.
研究的目的:
- 开发一种用于横向拉伸测量的新配方,以尽量减少参数估计中的错误.
- 为了研究纯和软复合材料的大型变形行为,包括波桑比率和体积变化.
- 使用开发的方法分析生物软组织的可压缩性和异构性.
主要方法:
- 在纯和复合材料样本上进行了单轴张力测试.
- 数字图像相关性 (DIC) 用于测量纵向和横向 (在平面内和平面外) 的延伸.
- 开发并应用了一种新的公式,将横向延伸与纵向延伸联系起来,并结合Poisson的比率和依赖延伸的参数.
主要成果:
- 纯在较大的变形下表现出同otropic 和几乎不可压缩的行为.
- 用可伸缩面料增强的复合材料显示Poisson的比率超过了古典界限,包括辅助性行为 (负Poisson比率).
- 对人体皮肤,大动脉壁和纤维状环的分析表明,大多数软组织是可压缩的和异构的,大动脉壁几乎是不可压缩的.
结论:
- 开发的配方有效地估计了Poisson的函数和体积比,用于大应变下的软材料.
- 纯可以建模为不可压缩,而软复合材料需要考虑体积比.
- 软生物组织通常是可压缩的和异型的,强调了需要精确的变形测量技术的需要.
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