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Related Concept Videos

Stress Concentrations01:24

Stress Concentrations

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 width...
Stress Concentrations01:13

Stress Concentrations

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 concentration...
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
General State of Stress01:21

General State of Stress

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...
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

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.
Transformation of Plane Stress01:18

Transformation of Plane Stress

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 faces...

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Related Experiment Video

Updated: May 23, 2026

Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
13:07

Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression

Published on: January 15, 2022

An analytical solution for the stress state at stent-coating interfaces.

G Parry1, P McGarry

  • 1SIMAP Institut National Polytechnique de Grenoble Domaine Universitaire, 1130 Rue de la Piscine - 38 402 St Martin d'Heres Cedex, France. guillaume.parry@simap.grenoble-inp.fr

Journal of the Mechanical Behavior of Biomedical Materials
|April 24, 2012
PubMed
Summary

This study presents an analytical solution for stress in coated stents, focusing on interface stresses. Findings reveal how stent geometry and deployment impact normal and shear stresses, crucial for stent-coating design.

More Related Videos

Monitoring the Wall Mechanics During Stent Deployment in a Vessel
08:28

Monitoring the Wall Mechanics During Stent Deployment in a Vessel

Published on: May 8, 2012

Related Experiment Videos

Last Updated: May 23, 2026

Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
13:07

Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression

Published on: January 15, 2022

Monitoring the Wall Mechanics During Stent Deployment in a Vessel
08:28

Monitoring the Wall Mechanics During Stent Deployment in a Vessel

Published on: May 8, 2012

Area of Science:

  • Biomaterials Engineering
  • Mechanical Engineering
  • Medical Device Design

Background:

  • Coated stents are critical medical devices, but understanding interface stresses between the stent and its coating is essential for performance and longevity.
  • Existing models often simplify stent architecture, potentially overlooking crucial stress distributions at the coating-stent interface.

Purpose of the Study:

  • To develop an analytical solution for evaluating interface stresses in coated stent designs.
  • To investigate the influence of boundary conditions, geometry, and material properties on normal and shear stresses at the stent-coating interface.
  • To provide practical insights for optimizing coated stent design through stress analysis.

Main Methods:

  • An analytical approach was used, starting with a simplified bi-layered composite elastic arch model.
  • A more realistic coated stent geometry was created by adding a composite elastic strut to the arch.
  • Stent deployment was simulated by applying displacement to the strut base.

Main Results:

  • Distinct normal and shear stress distributions were observed at the interface, dependent on applied displacement and rotation.
  • The addition of the strut significantly altered interface stresses, increasing normal stress while decreasing shear stress.
  • The study explored the impact of various geometric and material parameters on interface stress.

Conclusions:

  • The analytical model provides a method to predict and understand interface stresses in coated stents.
  • Understanding these stresses is vital for improving the mechanical integrity and clinical performance of coated stents.
  • The findings offer practical guidance for engineers designing next-generation coated stents.