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Related Concept Videos

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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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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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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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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Static Friction01:18

Static Friction

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Static friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It plays a crucial role in our daily lives, from walking on the ground to driving a car.
For example, consider a scenario where a truck is connected to a car by a rope, ready to tow it along a road. When no external force is applied by the truck, the car remains stationary and is said to be in static equilibrium. In this case, the forces acting on the car, such as gravity and the...
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Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

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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.
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The Conditions Necessary for the Formation of Dissipative Structures in Tribo-Films on Friction Surfaces That

Iosif S Gershman1, German Fox-Rabinovich2, Eugeniy Gershman3

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Friction and wear reduction is achieved through self-organization processes within tribo-films. These processes, driven by negative entropy production, lead to the formation of dissipative structures and significantly lower wear rates.

Keywords:
Ziegler’s principlecurrent collectioncuttingentropy productionfrictionplain bearingsself-organizationtribo-filmswear

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Area of Science:

  • Materials Science
  • Tribology
  • Thermodynamics

Background:

  • Tribo-films form on surfaces due to friction and wear, influencing the wear rate.
  • Physical-chemical processes with negative entropy production are crucial for wear rate reduction.
  • Self-organization and dissipative structure formation are key to initiating these wear-reducing processes.

Purpose of the Study:

  • To investigate entropy production behavior leading to thermodynamic instability.
  • To identify friction modes that promote self-organization.
  • To understand the link between self-organization, tribo-film formation, and wear reduction.

Main Methods:

  • Analysis of entropy production during the running-in stage of a tribo-system.
  • Investigation of thermodynamic stability loss.
  • Observation of tribo-film formation and dissipative structure development.

Main Results:

  • Self-organization, leading to dissipative structure formation in tribo-films, significantly reduces wear rates.
  • A tribo-system loses thermodynamic stability at the point of maximum entropy production during the running-in phase.
  • Negative entropy production processes enhance wear rate reduction.

Conclusions:

  • Self-organization is essential for forming wear-reducing tribo-films with dissipative structures.
  • Maximum entropy production during the running-in stage signifies the onset of thermodynamic instability, enabling self-organization.
  • Understanding these thermodynamic principles can optimize friction and wear reduction strategies.