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Related Concept Videos

Stresses under Combined Loadings01:23

Stresses under Combined Loadings

285
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...
285
Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

370
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
370
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

329
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
329
Stress Concentrations01:13

Stress Concentrations

409
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...
409
Stress Concentrations01:24

Stress Concentrations

460
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...
460
Flexural Stress01:16

Flexural Stress

462
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
462

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From Bench Testing to Virtual Implantation: A Comparative Study Between Poly-l-Lactic Acid and Nickel-Titanium Braided Stents.

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Related Experiment Video

Updated: Nov 7, 2025

Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
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Analytical methods for braided stents design and comparison with FEA.

Alissa Zaccaria1, Giancarlo Pennati2, Lorenza Petrini3

  • 1LaBS, Dept. of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, Milan, Italy; Consorzio Intellimech, Bergamo, Italy.

Journal of the Mechanical Behavior of Biomedical Materials
|April 30, 2021
PubMed
Summary

This study introduces analytical tools to optimize braided stent design. Equations predict radial rigidity and diameter variations, reducing trial-and-error for improved stent performance.

Keywords:
In-silico modelingLooped endMultiple twistRadial rigiditySelf-expandable stent

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Medical Devices

Background:

  • Braiding technology is widely used for creating flexible, kink-resistant endoprostheses like stents.
  • Stent design often involves extensive trial-and-error to optimize manufacturing parameters.
  • These devices are crucial for minimally invasive treatments, particularly in the cardiovascular field.

Purpose of the Study:

  • To develop analytical tools for supporting braided stent design and optimization.
  • To provide easily implementable equations for predicting stent radial rigidity and diameter variation range.
  • To guide the selection of optimal geometrical and mechanical properties for desired stent performance.

Main Methods:

  • Development of analytical equations based on geometrical parameters and material stiffness.
  • Validation of analytical results using finite element simulations.
  • Comparison of simulation results with experimental tests.

Main Results:

  • The developed equations accurately predict the radial rigidity of braided stents, including complex features.
  • The tools allow for the prediction of diameter variation range for forming processes.
  • Analytical results were validated against experimental tests via finite element simulations.

Conclusions:

  • The analytical tools effectively support the design and optimization of braided stents.
  • These tools enable assessment of parameter modifications for achieving desired radial rigidity and deliverability.
  • The methodology guides the selection of optimal stent properties for various applications.