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Related Concept Videos

Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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.
Symmetric Member in Bending01:07

Symmetric Member in Bending

In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
Flexural Stress01:16

Flexural Stress

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...
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...
Frictional Forces on Screws01:17

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...

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Related Experiment Video

Updated: May 22, 2026

Building Finite Element Models to Investigate Zebrafish Jaw Biomechanics
14:11

Building Finite Element Models to Investigate Zebrafish Jaw Biomechanics

Published on: December 3, 2016

Does screw-bone interface modelling matter in finite element analyses?

Alisdair R MacLeod1, Pankaj Pankaj, A Hamish R W Simpson

  • 1Edinburgh Orthopaedic Engineering Centre, The University of Edinburgh, UK.

Journal of Biomechanics
|April 28, 2012
PubMed
Summary
This summary is machine-generated.

Interface modeling strategies significantly impact local bone stress around screws, but not overall fracture stability. The undersized pilot hole model showed the highest strains, affecting predictions of screw loosening and bone damage.

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Building Finite Element Models to Investigate Zebrafish Jaw Biomechanics
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Area of Science:

  • Orthopedic biomechanics
  • Finite element analysis in bone healing

Background:

  • Locking plates are used for tibial mid-shaft fracture fixation.
  • Accurate modeling of screw-bone interface is crucial for predicting mechanical outcomes.

Purpose of the Study:

  • To evaluate the impact of different screw-bone interface modeling strategies on tibial fracture fixation.
  • To compare fully bonded, sliding contact, and undersized pilot hole models.

Main Methods:

  • Finite element analysis (FEA) was used to simulate tibial mid-shaft fractures stabilized with locking plates.
  • Three interface models were investigated: fully bonded, sliding contact, and sliding contact with a thermal expansion approach for pre-stress in an undersized pilot hole.
  • Load-deformation response and local stress-strain distributions were analyzed.

Main Results:

  • Global load-deformation response showed minimal variation (<1%) across different interface models.
  • Local stress-strain environments around screws were significantly affected by interface modeling.
  • The undersized pilot hole model resulted in the highest peak minimum principal strains, 26% higher than the frictional interface model at 770 N.

Conclusions:

  • While global mechanical behavior is insensitive to interface modeling, local bone response is highly dependent.
  • The commonly used tie constraint is adequate for global analysis but may not reflect local stress concentrations.
  • Different interface models lead to varying predictions for screw loosening, bone damage, and stress shielding, highlighting the importance of model selection for accurate biomechanical assessment.