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Related Concept Videos

Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

738
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
738

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Artery buckling analysis using a four-fiber wall model.

Qin Liu1, Qi Wen2, Mohammad Mottahedi1

  • 1Department of Mechanical Engineering, University of Texas at San Antonio, San Antonio, TX 78249, USA.

Journal of Biomechanics
|June 29, 2014
PubMed
Summary
This summary is machine-generated.

Artery buckling, linked to aging and disease, was studied using a new 4-fiber model. This model accurately predicts how microscopic changes in artery walls affect buckling pressure.

Keywords:
Artery bucklingArtery wallCollagenCritical buckling pressureElastinExtracellular matrixFiber modelMechanical instability

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Mechanics
  • Materials Science

Background:

  • Artery tortuosity, associated with aging and diseases like hypertension and atherosclerosis, may result from artery bent buckling.
  • Understanding the link between microscopic arterial wall structure and macroscopic buckling behavior is crucial for cardiovascular research.

Purpose of the Study:

  • To develop arterial buckling equations based on a microstructure-informed 4-fiber reinforced wall model.
  • To simulate and analyze the impact of arterial wall microstructural alterations on buckling phenomena.

Main Methods:

  • Development of a novel 4-fiber reinforced wall model for arterial mechanics.
  • Derivation of arterial buckling equations incorporating microstructural parameters.
  • Simulation of elastin degradation and collagen fiber orientation changes within the arterial wall model.

Main Results:

  • The critical buckling pressure demonstrated a nonlinear increase with the axial stretch ratio.
  • The 4-fiber model predicted higher critical buckling pressures compared to the established Fung model.
  • The model successfully replicated experimental findings of reduced critical pressure due to elastin degradation and altered collagen fiber orientation.

Conclusions:

  • The 4-fiber reinforced wall model enhances understanding of arterial stability and its relationship to microstructural remodeling.
  • This validated model serves as a valuable tool for investigating arterial mechanics and pathological changes.