人类肺体组织的取决于应变速率的材料特性,使用逆有限元素方法
Yeswanth S Pydi1, Atri Nath2, Anoop Chawla2
1Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India. pyeswantsai@gmail.com.
Biomechanics and modeling in mechanobiology
|August 3, 2023
概括
研究人员确定了人类肺组织的紧张率依赖的材料特性,以改进损伤模拟. 这项研究为有限元模型提供了关键数据,用于分析汽车事故造成的胸部创伤.
科学领域:
- 生物力学 生物力学
- 材料科学 材料科学 材料科学
- 计算建模 计算建模
背景情况:
- 汽车事故和重创伤经常导致严重的胸部损伤,特别是肺部组织.
- 准确模拟这些损伤需要动态材料属性为人体模型的肺组织.
- 目前的模型往往缺乏详细的,对肺瘤的应变率依赖的数据.
研究的目的:
- 为了确定人类肺瘤组织的取决于菌株速率的材料参数.
- 开发和验证一种材料模型,用于模拟动态负载条件下的肺组织行为.
- 提供必要的数据,以提高创伤分析中基于有限元素的人体模型的准确性.
主要方法:
- 在各种应变速率 (0.1到500秒-1之间) 上对人类肺组织进行了单轴准静态和动态压缩试验.
- 利用双线材料模型来描述肺组织的非线性,取决于速率的行为.
- 在LS-DYNA中实现了材料模型,并使用基于遗传算法的优化来通过反向映射来识别参数.
主要成果:
- 在特定应变速率 (0.1,100,300,500秒-1) 下,获得了人类肺组织的应变速率依赖的双线材料参数.
- 观察到弹性模量从43kPa增加到153kPa,脚应变率随着应变率的增加,脚应变率从0.39降至0.29.
- 证实了优化材料特性与应用于应变速率之间的断片线性关系.
结论:
- 这项研究成功地描述了人类肺组织的动态材料特性.
- 衍生参数和双线模型提高了胸部创伤有限元模拟的可靠性.
- 这项研究为在撞击场景中更准确地预测肺损伤严重程度提供了基础.
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