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Related Concept Videos

Bearings: Problem Solving01:24

Bearings: Problem Solving

Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...
Collar Bearings01:23

Collar Bearings

Collar bearings are essential in various machines designed to support axial loads on rotating shafts. Depending on the specific application and requirements, they can be found with single or multiple collars.
Pivot Bearings01:23

Pivot Bearings

In mechanical systems, bearings are crucial in facilitating relative motion between two components while minimizing friction and wear. They help distribute various loads (radial, axial or a combination of both loads) across machinery parts, ensuring smooth and efficient operation.
A pivot bearing is a specialized type of bearing designed to support axial loads on a rotating shaft. The bearing surface, or the pivot, is positioned at the end of a shaft to support the axial thrust. The pivot may...
Journal Bearings01:23

Journal Bearings

Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
Bearing Stress01:22

Bearing Stress

Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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Related Experiment Video

Updated: May 7, 2026

Fused Filament Fabrication (FFF) of Metal-Ceramic Components
08:43

Fused Filament Fabrication (FFF) of Metal-Ceramic Components

Published on: January 11, 2019

Ceramic-Ceramic Bearing: Too Unpredictable to Use it Regularly.

Edwin P Su1

  • 1Clinical Orthopaedic Surgery, Weill Cornell Medical College, New York, NY 10065 USA ; Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021 USA.

HSS Journal : the Musculoskeletal Journal of Hospital for Special Surgery
|October 2, 2013
PubMed
Summary

Ceramic-on-ceramic (CoC) hip bearings offer good tribology but can lead to squeaking and fracture complications. Their use should be reserved for specific patients due to unpredictable outcomes.

Keywords:
bearing surfacesceramiccomplicationssqueakingtotal hip arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Tribology

Background:

  • Ceramic-on-ceramic (CoC) bearings possess superior tribologic properties like smoothness and hardness.
  • These properties make them suitable for younger, active patients undergoing total hip replacement.
  • However, CoC bearings are associated with complications such as squeaking and fracture.

Purpose of the Study:

  • To review the literature on complications associated with ceramic-on-ceramic bearings in total hip replacements.
  • To analyze the implications of these complications for patient outcomes and implant selection.

Main Methods:

  • A systematic literature search was conducted using PubMed.
  • Keywords included "ceramic-ceramic total hip replacement," "complications," "squeaking," and "fracture."
  • Inclusion criteria focused on clinical studies reporting complication incidence.

Main Results:

  • Squeaking in CoC bearings is linked to edge loading, wear, and influenced by patient factors and implant design.
  • Fracture is a serious complication requiring revision surgery, though manufacturing improvements have reduced its incidence.
  • Ceramic material remains susceptible to fracture from impingement and malposition.

Conclusions:

  • The unpredictable nature of CoC bearing complications warrants caution in their routine use.
  • The application of CoC bearings should be carefully considered and potentially limited to select patient groups.
  • Further research may be needed to mitigate risks and improve predictability.