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Related Concept Videos

Frictional Forces on Screws01:17

Frictional Forces on Screws

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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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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Screw: Problem Solving01:21

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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
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Thin-Walled Hollow Shafts01:15

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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...
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Wood Fasteners01:18

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In wood construction, fasteners are essential for securing components together, with the connection strength largely dependent on the direct bearing between members. Various types of fasteners are employed, each suited to specific applications and structural requirements.
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Shear and Bending Moment Diagram: Problem Solving01:24

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When analyzing a beam supporting concentrated loads and a distributed load, drawing the shear and bending moment diagrams is essential. These diagrams help understand the internal forces and moments acting on the beam, which is crucial for designing safe and efficient structures. Follow these steps to create the shear and bending moment diagrams:
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Related Experiment Video

Updated: Nov 16, 2025

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
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Self-Drilling Versus Self-Tapping Screws: A 3D Finite Element Analysis.

Vineeth K Kumar1, Kavitha Prasad1, Tanvy Sansgiri1

  • 1Faculty of Dental Sciences, Department of Oral and Maxillofacial Surgery, Ramaiah University of Applied Sciences, Bengaluru, Karnataka, India.

Craniomaxillofacial Trauma & Reconstruction
|February 22, 2021
PubMed
Summary
This summary is machine-generated.

Self-tapping screws show higher stress and deformation at the screw-bone interface compared to self-drilling screws, indicating increased fatigue incidence in mandibular fracture fixation. This suggests self-drilling screws may offer better plate retention and stability.

Keywords:
FEA of screwsmandible fractureopen reduction and internal fixationself-drilling screwsself-tapping screws

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Area of Science:

  • Biomaterials Engineering
  • Orthopedic Surgery
  • Computational Mechanics

Background:

  • Plate fixation is crucial for internal fixation of mandibular fractures.
  • Self-tapping and self-drilling screws are common fixation modalities.
  • Self-tapping screws may present drawbacks such as loosening and thermal osteolysis compared to self-drilling screws.

Purpose of the Study:

  • To compare the efficacy of self-tapping and self-drilling screws in mandibular fracture fixation.
  • To evaluate plate retention and stability using 3D finite element analysis (FEA).
  • To determine the influence of screw type on stress concentration and deformation at the screw-bone interface.

Main Methods:

  • A 3D finite element model of a trilaminate mandible, screws, and miniplate was created.
  • Material properties and boundary conditions were assigned.
  • Pullout, torque, and torsional forces were applied to analyze stress and deformation.

Main Results:

  • The self-tapping screw exhibited higher Von Mises stress and deformation at the screw-bone interface compared to the self-drilling screw.
  • These findings were consistent across torque, pullout, and torsional tests.
  • Increased stress distribution and deformation were observed with self-tapping screws.

Conclusions:

  • Self-tapping screws demonstrate a greater incidence of fatigue in mandibular fracture fixation compared to self-drilling screws.
  • Self-drilling screws may offer superior plate retention and stability.
  • FEA provides valuable insights into screw-bone interface mechanics for internal fixation devices.