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Impact01:30

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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.
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Drag-force regimes in granular impact.

Mukesh Tiwari1, T R Krishna Mohan2, Surajit Sen3

  • 1Dhirubhai Ambani Institute of Information and Communication Technology (DA-IICT), 382007 Gandhinagar, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 24, 2015
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Summary
This summary is machine-generated.

Projectile penetration into granular materials was studied. The drag force follows the generalized Poncelet law, with distinct penetration regimes identified based on projectile position and kinetic energy.

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Area of Science:

  • Physics
  • Granular Mechanics
  • Computational Physics

Background:

  • Understanding projectile penetration into granular media is crucial for various applications.
  • Previous studies have invoked the generalized Poncelet law to explain drag forces in granular impacts.

Purpose of the Study:

  • To investigate the 3D penetration dynamics of a projectile impacting a granular substrate.
  • To identify and characterize different penetration regimes based on impact velocity and projectile motion.

Main Methods:

  • Three-dimensional simulations using the discrete element method (DEM).
  • Analysis of projectile penetration depth, normal force, and drag force dynamics.

Main Results:

  • Penetration depth scaling is consistent with experimental data for low-velocity impacts.
  • The normal force on the projectile comprises position- and kinetic energy-dependent components.
  • Three distinct penetration regimes were identified, characterized by varying drag force dependencies.

Conclusions:

  • The generalized Poncelet law accurately describes the drag force experienced by the projectile.
  • Penetration dynamics are governed by distinct regimes related to granular bed configurations.
  • The findings provide insights into granular impact physics and material behavior.