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Related Concept Videos

Dry Friction01:30

Dry Friction

390
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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Types of Friction Problems01:27

Types of Friction Problems

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Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion....
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Frictional Force01:07

Frictional Force

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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...
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Friction: Problem Solving01:21

Friction: Problem Solving

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Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...
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Kinetic Friction01:26

Kinetic Friction

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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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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...
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Evolution of real contact area under shear and the value of static friction of soft materials.

Proceedings of the National Academy of Sciences of the United States of America·2018
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Designing metainterfaces with specified friction laws.

Antoine Aymard1, Emilie Delplanque1, Davy Dalmas1

  • 1Université de Lyon, École Centrale de Lyon, CNRS, ENTPE, LTDS, UMR5513, 69130 Ecully, France.

Science (New York, N.Y.)
|January 11, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new surface design strategy to precisely control friction in dry contact interfaces. This method allows for predictable friction laws, enabling adaptable smart interfaces for devices like touchscreens and robotic hands.

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Area of Science:

  • Materials Science
  • Tribology
  • Surface Engineering

Background:

  • Frictional contacts are crucial in many devices, such as touchscreens and robotic hands.
  • Optimizing device performance requires precise control over the friction law of interfaces.
  • Current methods lack systematic approaches for designing dry contact interfaces with specific frictional behaviors.

Purpose of the Study:

  • To propose a generic surface design strategy for creating dry rough interfaces with predefined relationships between normal and friction forces.
  • To demonstrate a method for achieving targeted friction laws in engineered surfaces.
  • To enable the development of adaptable smart interfaces with controllable friction.

Main Methods:

  • Developed a surface design strategy based on simplified surface topographies (metainterfaces) composed of spherical asperities.
  • Optimized the heights of individual asperities to achieve specific friction laws.
  • Fabricated and tested centimeter-scaled elastomer-glass metainterfaces to validate the design strategy.

Main Results:

  • Successfully prepared dry rough interfaces with predefined friction laws.
  • Demonstrated the ability to achieve linear friction laws with specified coefficients.
  • Illustrated the creation of unusual nonlinear friction laws.
  • Validated the design strategy across different scales and materials.

Conclusions:

  • The proposed design strategy offers a systematic, scale- and material-independent, chemical-free pathway for controlling friction in dry interfaces.
  • This approach facilitates the development of energy-saving and adaptable smart interfaces.
  • The metainterface concept simplifies tribological challenges by focusing on controllable asperity arrangements.