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Related Concept Videos

Stress: General Loading Conditions01:15

Stress: General Loading Conditions

307
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....
307
Stress Concentrations01:24

Stress Concentrations

286
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...
286
Components of Stress01:23

Components of Stress

211
Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
Interestingly, the hidden cube faces also experience these stresses, equal and...
211
General State of Stress01:21

General State of Stress

183
The general state of stress within a material can be accurately depicted using a stress tensor. This tensor encapsulates the internal forces distributed within a material subjected to external forces or deformations.
Specifically, consider a tetrahedral element where one face, labeled XYZ, is perpendicular to the line OA, and the remaining faces align with the coordinate axes with point O as the origin. At any point, such as point O, the stress tensor can be used to determine the stress...
183
Principal Stresses01:24

Principal Stresses

194
The graphical depiction of normal and shearing stress equations is represented by a circle, demonstrating the interplay between these stresses under different angular conditions. The center of this circle C, located on the vertical axis, represents the average normal stress, while its radius shows the range of stress variations. At points A and B, where the circle intersects the horizontal axis, the maximum and minimum normal stresses are observed, occurring without shearing stress. These...
194
Transformation of Plane Stress01:18

Transformation of Plane Stress

222
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...
222

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Updated: Jun 27, 2025

Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption
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Stress-shape misalignment in confluent cell layers.

Mehrana R Nejad1, Liam J Ruske2, Molly McCord3,4

  • 1The Rudolf Peierls Centre for Theoretical Physics, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom. mehrana@g.harvard.edu.

Nature Communications
|April 29, 2024
PubMed
Summary
This summary is machine-generated.

Cells can control their contractile forces independently of their shape during tissue formation. This discovery challenges previous assumptions about cell mechanics and offers new insights into tissue repair and development.

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Engineering Fibrin-based Tissue Constructs from Myofibroblasts and Application of Constraints and Strain to Induce Cell and Collagen Reorganization
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Shape Memory Polymers for Active Cell Culture
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Area of Science:

  • Cell biology
  • Biophysics
  • Developmental biology

Background:

  • Epithelial cells generate active forces crucial for tissue formation and repair.
  • It is commonly assumed that cellular contractile stresses align with cell body orientation.

Purpose of the Study:

  • To investigate the relationship between cell shape and cell-generated contractile stresses.
  • To determine if cellular contractile stresses can be decoupled from cell body orientation.

Main Methods:

  • Simultaneous measurement of cell shape and cell-generated contractile stress orientations.
  • Development of a continuum model to analyze stress and cell body dynamics.

Main Results:

  • Observed dynamic domains where contractile stresses were systematically misaligned with cell body orientation.
  • The developed continuum model successfully replicated the experimental spatial and temporal dynamics of stress misalignment.
  • Demonstrated that cells control contractile forces independently of cell shape.

Conclusions:

  • Cellular contractile forces are not rigidly coupled to cell shape.
  • This decoupling suggests greater flexibility in the physical rules governing cell force generation and cell shape.
  • Findings have implications for understanding tissue morphogenesis and repair mechanisms.