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Related Concept Videos

Fatigue01:21

Fatigue

Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
Dry Friction01:30

Dry Friction

Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
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...
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Rolling Resistance01:21

Rolling Resistance

When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...

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Related Experiment Video

Updated: Jul 10, 2026

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
07:39

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults

Published on: November 6, 2021

Sliding contact fatigue damage in layered ceramic structures.

J-W Kim1, J-H Kim, V P Thompson

  • 1Department of Biomaterials and Biomimetics, New York University College of Dentistry, 345 E. 24th St., Room 813C, New York, NY 10010, USA.

Journal of Dental Research
|October 26, 2007
PubMed
Summary

Bi-axial loading, simulating chewing, causes faster fatigue damage in dental ceramics than uni-axial loading. This finding is crucial for understanding and preventing porcelain veneer fractures in dental restorations.

Related Experiment Videos

Last Updated: Jul 10, 2026

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
07:39

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults

Published on: November 6, 2021

Area of Science:

  • Biomaterials Science
  • Mechanical Engineering
  • Dental Materials

Background:

  • Porcelain-veneered restorations are prone to chipping and fracture under occlusal loading.
  • Existing fatigue studies often lack the complexity of real-world chewing motions.

Purpose of the Study:

  • To compare the fatigue behavior of layered ceramics under uni-axial versus bi-axial loading conditions.
  • To investigate the effect of sliding motion during cyclic loading on ceramic fatigue.

Main Methods:

  • A mouth-motion simulator applied cyclic contact loading (uni-axial and bi-axial) to monolithic glass plates bonded to polycarbonate substrates.
  • Bi-axial loading simulated a masticatory cycle (contact-load-slide-liftoff).
  • Fracture mechanics principles were used to describe damage evolution.

Main Results:

  • Bi-axial fatigue loading resulted in more severe damage and accelerated crack growth compared to uni-axial loading.
  • Uni-axial loading (contact-load-hold-liftoff) and traditional R-ratio fatigue showed similar lifespans.
  • Enhanced tensile stresses at the indenter's trailing edge contribute to accelerated crack growth in bi-axial fatigue.

Conclusions:

  • Bi-axial loading, incorporating sliding motion, significantly accelerates ceramic fatigue compared to uni-axial loading.
  • The findings provide insights into the failure mechanisms of dental ceramics under functional conditions.
  • This research has clinical relevance for improving the durability of porcelain-veneered dental restorations.