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相关概念视频

Measurements of Strain01:27

Measurements of Strain

2.5K
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...
2.5K
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

522
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
522
Residual Stresses01:26

Residual Stresses

581
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
581
Stress-Strain Diagram01:10

Stress-Strain Diagram

2.2K
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
2.2K
Residual Stresses in Bending01:18

Residual Stresses in Bending

508
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
508
True Stress and True Strain01:28

True Stress and True Strain

785
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...
785

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相关实验视频

Updated: Jan 13, 2026

Measuring Local Tissue Strains in Tendons via Open-Source Digital Image Correlation
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用贝叶斯反向应力显微镜测量组织应力.

Lucas Anger1, Andreas Schoenit1, Fanny Wodrascka1

  • 1Institut Jacques Monod, CNRS, Université Paris Cité, 75013, Paris, France.

The European physical journal. E, Soft matter
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概括

贝叶斯反向应力显微镜 (BISM) 测量内部组织应力,而不对细胞特性做出假设. 这种强大的技术准确地量化了各种受限生物组织中的细胞力量,进步了我们对细胞功能的机械作用的理解.

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科学领域:

  • 生物物理学的生物物理.
  • 细胞生物学 细胞生物学
  • 机械生物学 机械生物学

背景情况:

  • 组织中的细胞经历了生物过程至关重要的动态机械力.
  • 了解内部组织压力是研究细胞形态发生,迁移,分裂和死亡的关键.
  • 以前测量组织应激的方法存在局限性,特别是在复杂的细胞环境中.

研究的目的:

  • 引入和验证贝叶斯反转应力显微镜 (BISM) 用于测量封闭细胞单层中的绝对应力.
  • 为了证明BISM在各种实验条件和细胞类型中的广泛适用性和稳定性.
  • 将BISM与现有的压力测量技术进行比较,并讨论其潜力和局限性.

主要方法:

  • 贝叶斯反向应力显微镜 (BISM) 被采用,依赖于测量细胞产生的引力.
  • 实验是在受限细胞单层上进行的,其边界条件和细胞类型各不相同.
  • 应用了BISM,没有对细胞类风湿学做出假设.

主要成果:

  • BISM准确地测量了封闭细胞单层中的绝对应力.
  • 该技术被证明是稳固的,适用于任意形状和多种细胞组成的组织.
  • 即使没有先前的细胞类风湿学知识,BISM也证明了它的有效性.

结论:

  • BISM是一种多功能且强大的方法,用于在各种生物环境中量化内部组织应激.
  • 由于该技术能够在没有学假设的情况下工作,使其适用于复杂,异质组织.
  • BISM为推进机械生物学和相关细胞过程的研究提供了有价值的工具.