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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

928
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
928
Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

240
Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
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Dry Friction01:30

Dry Friction

773
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...
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Frictional Force01:07

Frictional Force

9.3K
When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
9.3K
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

389
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
389

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Related Experiment Video

Updated: Dec 13, 2025

Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
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Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

Published on: March 29, 2018

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Toward Robust Macroscale Superlubricity on Engineering Steel Substrate.

Panpan Li1,2, Pengfei Ju3, Li Ji1,2

  • 1Key Laboratory of Science and Technology on Wear and Protection of Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 28, 2020
PubMed
Summary

Researchers achieved macroscale structural superlubricity by engineering steel surfaces with micro-contacts. This breakthrough significantly reduces friction and wear, paving the way for industrial applications of superlubricity.

Keywords:
2D nanomaterialsengineering steel substratesmacroscalestructural superlubricity

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Related Experiment Videos

Last Updated: Dec 13, 2025

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Area of Science:

  • Tribology
  • Materials Science
  • Mechanical Engineering

Background:

  • Structural superlubricity, a state of extremely low friction, is currently limited to nanoscale and microscale applications.
  • Achieving macroscale superlubricity is crucial for widespread industrial adoption in mechanical engineering.

Purpose of the Study:

  • To demonstrate a novel principle for achieving macroscale structural superlubricity.
  • To overcome the limitations of current nanoscale and microscale superlubricity.

Main Methods:

  • Engineered micro-asperity topography on steel substrates to create numerous micro-contacts.
  • Implemented pre-running-in periods and coated interfaces with heterogeneous nanocomposites of 2D materials.
  • Manipulated interfacial ordered states, weak chemical interactions, and incommensurate configurations at contact points.

Main Results:

  • Achieved robust superlubricating states on macroscale steel-steel contact pairs.
  • Reduced friction coefficients to the 10⁻³ magnitude.
  • Demonstrated extended antiwear life exceeding 1.0 × 10⁶ laps with good material and load universality.

Conclusions:

  • Successfully broadened structural superlubricity from microscale to macroscale.
  • The developed method shows significant potential for the industrialization of structural superlubricity.
  • The approach offers a viable path for reducing friction and wear in engineering applications.