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Related Concept Videos

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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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...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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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.
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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Force Transmission in Disordered Fibre Networks.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Cells exert forces on their surroundings to remodel the extracellular matrix (ECM) and transmit mechanical signals.
  • Understanding force propagation in the ECM is crucial for cell-matrix interactions.

Purpose of the Study:

  • To model how locally applied cell contraction forces propagate through fibrous ECM networks.
  • To investigate the influence of network connectivity and fiber bending rigidity on force transmission.

Main Methods:

  • Utilized a minimalist computational model.
  • Simulated force propagation from cell contraction in fibrous networks.

Main Results:

  • In highly connected networks, stresses spread isotropically, saturating at a characteristic length.
  • Lower connectivity networks exhibit asymmetric stress patterns with long-range force chains.
  • Force transmission is dependent on network connectivity and fiber bending rigidity.

Conclusions:

  • Network connectivity significantly dictates force transmission patterns in the ECM.
  • Minimalist models can elucidate complex cell-ECM mechanical feedback mechanisms.
  • Findings offer insights into cellular mechanotransduction and tissue mechanics.