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相关概念视频

Measurements of Strain01:27

Measurements of Strain

401
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
401
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

443
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
443
True Stress and True Strain01:28

True Stress and True Strain

272
Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
272

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相关实验视频

Updated: Jun 5, 2025

Monitoring the Wall Mechanics During Stent Deployment in a Vessel
08:28

Monitoring the Wall Mechanics During Stent Deployment in a Vessel

Published on: May 8, 2012

9.2K

在动态负载下通过高频超声波量化内部磁盘应变的量化.

Elnaz Ghajar-Rahimi1, Diya D Sakhrani1,2, Radhika S Kulkarni1,2

  • 1Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907.

Journal of biomechanical engineering
|December 5, 2024
PubMed
概括
此摘要是机器生成的。

高频超声波量化了动态负载期间的椎间盘张力. 这种新的方法揭示了异构的应变模式,这对于理解椎间盘损伤和开发计算模型至关重要.

关键词:
动态加载 动态加载椎间盘之间的椎间盘.压力 压力 压力 压力质地相关性 质地相关性超声波超声波是指超声波的使用.

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相关实验视频

Last Updated: Jun 5, 2025

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科学领域:

  • 生物力学 生物力学
  • 医疗成像医学成像

背景情况:

  • 准确测量椎间盘张力对于损伤研究和计算模型验证至关重要.
  • 目前的非侵入性方法通常使用影响组织力学或仅限于静态条件的标记物.

研究的目的:

  • 为了整合高频超声波和纹理相关性,以量化动态负载下磁盘应变.
  • 建立一种非侵入性方法,在生理条件下评估内部磁盘机制.

主要方法:

  • 在横平面中使用高频超声波对牛脊椎间盘进行成像.
  • 在0.3-0.5Hz的轴向压缩 (0-0.5mm) 被动态应用.
  • 直接变形估计 (DDE),是一种纹理关联技术,随着时间的推移量化了内部的绿色-拉格兰奇菌株.

主要成果:

  • 在最大压缩时,主要应变的中位数为0.038±0.011 (E1) 和-0.042±0.012 (E2).
  • 菌株分布异质,在盘末板附近观察到更高的菌株.

结论:

  • 高频超声波与纹理相关性相结合,是量化动态加载期间磁盘应变的有价值工具.
  • 这种方法有可能用于诊断和管理磁盘疾病的临床应用.