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相关概念视频

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

654
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...
654
Plastic Behavior01:21

Plastic Behavior

259
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
259
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

326
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
326
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

215
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
215

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相关实验视频

Updated: Sep 9, 2025

Engineering Fibrin-based Tissue Constructs from Myofibroblasts and Application of Constraints and Strain to Induce Cell and Collagen Reorganization
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形状记忆 原基架 维持大规模循环负荷

Yan Luo1, Hardik Makkar2,3, Yuntao Hu4,5

  • 1Mechanical Engineering and Applied Mechanics, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

ACS materials letters
|September 5, 2025
PubMed
概括

这项研究使用预压缩和冷化开发了机械强大的原体支架. 这些密集的形状记忆水凝在循环负荷下表现出异常的弹性,在动态环境中支持细胞活力.

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科学领域:

  • 生物材料科学
  • 组织工程
  • 材料科学

背景情况:

  • 自然生物聚合物水凝在动态负荷下具有机械强度和稳定性的限制.
  • 开发强大的水凝支架对于动态机械环境中的应用至关重要.

研究的目的:

  • 为动态应用设计具有增强机械性能的交叉连接原体冷凝支架.
  • 在循环负荷下研究密集的原支架的结构和机械弹性.

主要方法:

  • 通过预压缩和冷化制造交叉连接的原体冷基架.
  • 使用循环压缩负荷和奥格登超弹性建模进行机械性能评估.
  • 使用第二波成像 (SHG) 的微结构分析.
  • 细胞封装,活力和对周期性负荷的反应的评估.

主要成果:

  • 密集的支架在200个周期内承受了90%以上的轴向压力,显示出了显著的弹性.
  • 奥格登建模和SHG成像显示纤维对齐和应变固有助于机械强度.
  • 重水化水凝表现出网络稳定性和可回收性,相位过渡应变减少.
  • 在循环负荷下,基架维持细胞活力并促进细胞密度.

结论:

  • 密集,形状记忆的原体支架为动态环境提供了机械坚固和生物相容的解决方案.
  • 开发的脚手架对需要在重复性大规模机械应力下持续性能的应用具有前景.
  • 这种方法提高了自然生物聚合物的实用性,