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Frictional Forces on Screws

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: Oct 7, 2025

Author Spotlight: Rapid Prototyping and Testing of Self-Expanding Nitinol Frames for Transcatheter Implantable Devices

Author Spotlight: Rapid Prototyping and Testing of Self-Expanding Nitinol Frames for Transcatheter Implantable Devices

Published on: March 7, 2025

Functionalization of screw implants with superelastic structured Nitinol anchoring elements.

Isabell Hamann^1,2,3, Stefan Schleifenbaum^4,5, Christian Rotsch^6,4,5

¹Fraunhofer Institute for Machine Tools and Forming Technology IWU, 01187, Dresden, Germany. isabell.hamann@iwu.fraunhofer.de.

Biomedical Engineering Online

|January 11, 2022

Summary

This summary is machine-generated.

Modified screw implants with superelastic titanium-aluminum-vanadium anchoring elements show improved bone anchorage. These novel implants are technically feasible and demonstrate enhanced stability for orthopedic and neurosurgical applications.

Keywords:

Additive manufacturing Biomechanic Nitinol Screw implants Superelasticity

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Last Updated: Oct 7, 2025

Author Spotlight: Rapid Prototyping and Testing of Self-Expanding Nitinol Frames for Transcatheter Implantable Devices

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Published on: March 7, 2025

Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications

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Published on: December 8, 2015

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Area of Science:

Biomaterials Engineering
Orthopedic Surgery
Medical Device Design

Background:

Increasing prevalence of osteoporotic patients necessitates improved implant stability.
Conventional screw implants require enhanced anchoring in bone.
Superelastic, structured Ti6Al4V anchoring elements offer potential for improved stability.

Purpose of the Study:

To functionalize conventional screw implants with superelastic Ti6Al4V anchoring elements.
To evaluate the technical feasibility, handling, and anchorage stability of the novel implants.

Main Methods:

Mechanical modification of conventional screw implants to incorporate Ti6Al4V anchoring elements.
CT studies in artificial bone to assess element setup.
Simplified handling tests under surgical conditions.
Pullout tests (ASTM F543) to compare anchorage stability with standard screws.

Main Results:

Functionalization of implants with Ti6Al4V elements is technically achievable.
Anchoring elements demonstrated easy setup in artificial bone and handling under surgical conditions.
No negative influence on surgical procedures observed.
Increased mechanical work required for removal compared to standard screws, indicating enhanced anchorage.

Conclusions:

Conventional screw implants can be successfully functionalized with Ti6Al4V-structured NiTi anchoring elements.
The new screw type is suitable for orthopedic and neurosurgical applications.
Biomechanical testing confirmed increased anchoring stability.