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Related Concept Videos

Dry Friction01:30

Dry Friction

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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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Contact Angle01:13

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Frictional Force01:07

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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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Characteristics of Dry Friction01:21

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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.
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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.
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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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Control of Friction Laws in Tangential Adhesive Contacts by Surface Geometry.

Josefine Fritsch-Wilhayn1, Khudoyar Buranov2, Qiang Li1

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Summary

This study numerically investigates adhesive contact between rigid indenters and viscoelastic materials. Friction force depends on indenter shape, following distinct power-law relationships with normal force due to material viscoelasticity.

Keywords:
Boundary Element Methodadhesionfrictionindenter geometrytangential contactviscoelastic contact

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Tribology

Background:

  • Adhesive contact mechanics are crucial for understanding material interactions.
  • Viscoelastic materials exhibit time-dependent deformation and energy dissipation.
  • The influence of indenter geometry on adhesive contact in viscoelastic materials requires detailed investigation.

Purpose of the Study:

  • To numerically investigate adhesive quasi-static tangential contact between rigid indenters and a linearly viscoelastic half-space.
  • To analyze the effect of indenter geometry (parabolic, conical, sharp-tip) on contact behavior.
  • To determine the relationship between friction force and normal force for different indenter shapes.

Main Methods:

  • Numerical simulations using the Boundary Element Method (BEM).
  • Modeling adhesion via a stress-based detachment criterion and energetic approach.
  • Analysis of quasi-static viscoelastic contact under tangential sliding.

Main Results:

  • Asymmetric adhesion at the leading (weak) and trailing (strong) edges of the contact generates tangential force.
  • Friction force exhibits a strong dependence on indenter geometry.
  • Distinct power-law relationships were found between friction and normal force: 1/3 for parabolic, square-root for conical, and 2/3 for sharp-tip indenters.

Conclusions:

  • Indenter geometry significantly dictates the friction behavior in adhesive viscoelastic contact.
  • The findings provide quantitative relationships for predicting friction based on geometry and normal force.
  • This research contributes to a deeper understanding of tribological phenomena in viscoelastic materials.