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Impact01:30

Impact

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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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Principle of Linear Impulse and Momentum for a Single Particle01:20

Principle of Linear Impulse and Momentum for a Single Particle

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Linear momentum is a fundamental concept in physics that describes the motion of an object. It is a vector quantity, having a magnitude equal to the product of its mass and its velocity, and direction along the object's velocity. On the other hand, linear impulse, also known as momentum impulse, is a concept in physics related to the change in the linear momentum of an object. Impulse is a vector quantity defined as the product of force and the time over which the force is applied.
Delving...
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Principle of Linear Impulse and Momentum for a Single Particle: Problem Solving01:23

Principle of Linear Impulse and Momentum for a Single Particle: Problem Solving

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Consider a wooden box and a cylinder of known masses m1 and m2, respectively,  hanging from a ceiling with the help of a massless pulley system.
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Conservation of Linear Momentum for a System of Particles01:28

Conservation of Linear Momentum for a System of Particles

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In the dynamic realm of billiards, a fascinating interplay of forces governs the motion of cue balls and stationary balls. When the cue ball collides with a stationary ball, linear momentum is exchanged. The cue ball imparts a fraction of its linear momentum to the stationary ball, causing the cue ball to decelerate while initiating the motion of the stationary ball.
The impulsive force at play during this interaction is of extremely short duration, rendering its impulse negligible. When...
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Principle of Linear Impulse and Momentum for a System of Particles01:21

Principle of Linear Impulse and Momentum for a System of Particles

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In the context of a system of particles moving relative to an inertial frame of reference, the equation of motion is a crucial tool for understanding the dynamics of the system. This equation, which accounts for external forces acting on each particle, plays a fundamental role in describing the system's behavior.
Notably, internal forces between particles, occurring in equal and opposite collinear pairs, cancel out and are not part of the equation of motion. This exclusion simplifies the...
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Impact: Problem Solving01:26

Impact: Problem Solving

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In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
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Related Experiment Video

Updated: Feb 25, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
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Discrete Particle Method for Simulating Hypervelocity Impact Phenomena.

Erkai Watson1, Martin O Steinhauser2,3

  • 1Department of Systems Solutions, Fraunhofer-Institute for High-Speed Dynamics, Ernst-Mach-Institut,EMI, Eckerstrasse 4, 79104 Freiburg, Germany. erkai.watson@emi.fraunhofer.de.

Materials (Basel, Switzerland)
|August 5, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a computational model using the Discrete Element Method (DEM) for hypervelocity impacts (HVI) beyond 5 km/s. DEM simulations accurately model material fragmentation and debris clouds in HVI events.

Keywords:
Discrete Element Methodcomputer simulationdebris cloudfragmentationhigh performance computinghypervelocity impactmultiscale modelingspace debris

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Area of Science:

  • Computational physics
  • Materials science
  • Impact dynamics

Background:

  • Hypervelocity impacts (HVI) are crucial in astrophysics and engineering.
  • Simulating HVI phenomena, especially fragmentation and debris clouds, presents significant computational challenges.
  • Existing models often struggle with accuracy at velocities exceeding 5 km/s.

Purpose of the Study:

  • Introduce a novel computational model for HVI simulation using the Discrete Element Method (DEM).
  • Investigate the dynamics of material fragmentation and debris cloud formation in HVI events.
  • Validate the DEM model against experimental data for hypervelocity impacts.

Main Methods:

  • Developed a DEM-based computational model using discrete spherical particles with interaction potentials.
  • Simulated hypervelocity impacts of a sphere striking a thin plate.
  • Conducted a systematic numerical study, including a parameter study, to analyze debris cloud properties.
  • Compared simulation results with experimental data from hypervelocity impact tests.

Main Results:

  • The DEM model provides stable and energy-conserving simulations for HVI scenarios.
  • The model accurately captures material fragmentation and debris cloud characteristics.
  • The simulation results show good agreement with experimental findings.
  • The DEM approach is effective for velocities where shock wave stresses exceed material strength.

Conclusions:

  • The Discrete Element Method is a viable and accurate tool for simulating hypervelocity impacts.
  • DEM simulations offer valuable insights into material fragmentation and debris cloud dynamics.
  • This work validates DEM for HVI research, particularly for high-stress impact regimes.