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Related Concept Videos

Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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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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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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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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Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

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Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
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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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Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
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Scalar model for frictional precursors dynamics.

Alessandro Taloni1, Andrea Benassi2, Stefan Sandfeld3

  • 1CNR-IENI, Via R. Cozzi 53, 20125 Milano, Italy.

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|February 3, 2015
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Summary

Frictional sliding involves detachment fronts appearing before global slip, a phenomenon not explained by traditional theories. This study models these precursors, revealing their dependence on geometry and loading conditions, crucial for understanding geophysical events.

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Area of Science:

  • Physics
  • Geophysics
  • Materials Science

Background:

  • Frictional sliding involves precursory activity (detachment fronts) not explained by traditional friction theories.
  • This precursory activity is vital for geophysical phenomena like earthquakes, landslides, and avalanches.

Purpose of the Study:

  • To simulate the onset of slip in a 3D elastic body.
  • To investigate the non-universal dependence of frictional precursors on sample geometry and loading conditions.
  • To analyze the dynamics of real contact area and internal stress distributions.

Main Methods:

  • Numerical simulation of a 3D elastic body on a surface.
  • Modeling adherence to Archard's and Amontons' laws.
  • Analysis of precursor envelope dynamics and stress evolution.

Main Results:

  • Frictional precursors exhibit complex, non-universal behavior dependent on geometry and loading.
  • The model accurately reproduces real contact area dynamics and precursor envelope dynamics.
  • Internal stress distributions and their evolution during precursor nucleation were detailed.

Conclusions:

  • Precursory activity in friction is an intrinsically quasi-static process.
  • Variations in Coulomb stress during precursor nucleation challenge simple monitoring-based forecasting methods.
  • Understanding these precursors is essential for improving models of earthquakes and other geophysical events.