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相关概念视频

Stress Concentrations01:24

Stress Concentrations

595
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
595
Stress Concentrations01:13

Stress Concentrations

564
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
564
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

514
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....
514
Distribution of Stresses in a Narrow Rectangular Beam01:11

Distribution of Stresses in a Narrow Rectangular Beam

468
In studying beam stress distribution, examining an elemental section is essential. To determine the average shearing stress on this face, the calculated shear is divided by the surface area. Importantly, shearing stresses on the beam's transverse and horizontal planes mirror each other, indicating a consistent stress distribution along the upper region of the beam. Notably, shearing stresses are absent at the beam's upper and lower surfaces due to the absence of applied forces in these...
468
Flexural Stress01:16

Flexural Stress

657
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
657
Transformation of Plane Stress01:18

Transformation of Plane Stress

666
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
666

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Full-Field Optical Coherence Microscopy for Histology-Like Analysis of Stromal Features in Corneal Grafts
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确定长度角质队列中的压力分布.

Magali M S Vandevenne1,2, Cynthia J Roberts3,4, Mathew Francis5

  • 1University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, the Netherlands.

Cornea
|December 11, 2025
PubMed
概括

通过分析角膜压力模式,可以预测角膜的进展. 在基线角膜应力 (CCSdiff) 的差异有助于预测随着时间的推移,角膜曲率的变化.

关键词:
生物力学 生物力学角膜 角膜 角膜 是一个形 (keratoconus) 是一种形.这是一个渐进的过程.压力分布的压力分布.

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科学领域:

  • 眼科医生 眼科 眼科
  • 生物机械工程 生物机械工程
  • 角膜成像分析分析

背景情况:

  • 角膜是一种渐进的角膜脱落,其特点是稀薄和化.
  • 准确预测角质结核病的进展对于及时干预和管理至关重要.
  • 目前用于预测进展的方法在捕捉早期生物力学变化方面存在局限性.

研究的目的:

  • 评估角眼中的压力分布模式是否可以预测未来的生物机械进展.
  • 利用纵向数据来评估角膜应力参数的预测能力.

主要方法:

  • 使用修改后的Hoop压力公式 (CCS = r/2t) 计算角膜对压力的贡献 (CCS).
  • 从Pentacam的曲率和厚度图中分析了CCS,重点是最小和最大CCS区域 (CCSdiff) 之间的差异.
  • 采用线性混合模型来评估CCSdiff对角膜曲率 (Cspot) 纵向变化的预测能力.

主要成果:

  • 包括114个眼和31个健康的对照眼睛.
  • 基线CCSdiff在角眼中与最大区域接触曲率 (Cspot) 有显著的相关性 (r = 0.83,P < 0.001).
  • 基线CCSdiff是随着时间推移Cspot进展的显著预测指标 (P < 0.001).

结论:

  • 角膜应力分布的差异 (CCSdiff) 是动态的,随着时间的推移而变化.
  • 基线CCSdiff值有效地预测了 keratoconus患者未来的生物机械进展.
  • 这种以压力为基础的指标为监测角瘤进展提供了一种新的方法.