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Related Concept Videos

Impact01:30

Impact

732
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
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Shock Waves01:16

Shock Waves

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Impact Loading01:19

Impact Loading

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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
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Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
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Conditions of Equilibrium01:28

Conditions of Equilibrium

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Equilibrium refers to a state where a rigid body is not subjected to any translational or rotational motion. This state is achieved when the force and couple acting on a rigid body equal zero. When the system of external forces results in a net effect equivalent to zero, the rigid body is considered to be in equilibrium.
Internal forces are not considered for conditions of equilibrium because they occur in equal and opposite pairs within the body, effectively canceling each other. As a result,...
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Gravitational Potential Energy for Extended Objects01:07

Gravitational Potential Energy for Extended Objects

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Consider a system comprising several point masses. The coordinates of the center of mass for this system can be expressed as the summation of the product of each mass and its position vector divided by the total mass:
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Related Experiment Video

Updated: Apr 21, 2026

Evaluating Primary Blast Effects In Vitro
10:51

Evaluating Primary Blast Effects In Vitro

Published on: September 18, 2017

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External front instabilities induced by a shocked particle ring.

V Rodriguez1, R Saurel1, G Jourdan1

  • 1Aix-Marseille Université, CNRS, IUSTI UMR 7343, 13013 Marseille, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 7, 2014
PubMed
Summary

Blast waves create particle jets from dispersed rings. Perturbation wavelengths on the ring surface remain constant, depending only on particle material, not acceleration.

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Area of Science:

  • Fluid Dynamics
  • Granular Mechanics
  • Physics of Complex Systems

Background:

  • Dispersion of particle rings by shock waves leads to particle jet formation.
  • Previous studies have not detailed the initial instability of dispersed particle layers.

Purpose of the Study:

  • To investigate the initial formation of perturbations on the external surface of a dispersed particle ring.
  • To analyze the relationship between particle layer acceleration and perturbation characteristics.

Main Methods:

  • Generating a blast wave within a granular medium ring confined in a Hele-Shaw cell.
  • Utilizing fast flow visualization to capture early-stage instability dynamics.
  • Quantifying perturbation wavelength and its dependence on acceleration.

Main Results:

  • Observed quasi-two-dimensional particle jet formation under impulsive acceleration.
  • Identified a constant critical area for external ring surface destabilization, independent of acceleration.
  • Found the dimensionless perturbation wavelength to be constant, irrespective of acceleration changes.
  • Determined that external front perturbations are solely dependent on particle material.

Conclusions:

  • The study details the initial instability of a dispersed particle ring under blast wave impact.
  • Key parameters governing perturbation formation, such as wavelength and destabilization area, are identified as constant and material-dependent.
  • This research provides fundamental insights into granular material behavior under dynamic loading conditions.