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Related Concept Videos

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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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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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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Nuclear Power02:36

Nuclear Power

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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Impulse01:13

Impulse

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According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
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Numerical Simulation Study on Impact Initiation on Shielded Charge Using Hypervelocity Composite-Structure Reactive

Yongjin Lu1, Bo Tan1, Yanxia Li2

  • 1College of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, China.

Polymers
|April 27, 2024
PubMed
Summary
This summary is machine-generated.

Hypervelocity reactive fragments made of PTFE/Al composites initiate shielded charges at lower velocities (2.6 km/s) than steel fragments (2.7 km/s) by releasing energy and prolonging shock pulses.

Keywords:
PTFE/Al materialdetonationhypervelocity impactimpact energy releaseshielded charge

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Explosives Engineering

Background:

  • Understanding the impact initiation of reactive fragments on shielded charges is crucial for safety and design.
  • Previous studies have explored hypervelocity impacts, but the specific mechanisms of composite reactive fragments require further investigation.

Purpose of the Study:

  • To numerically simulate and analyze the impact initiation process of PTFE/Al composite-structure reactive fragments on shielded charges.
  • To compare the detonation behavior of steel-coated and steel-semi-coated PTFE/Al fragments with steel fragments.
  • To determine the threshold velocities for impact initiation and elucidate the underlying mechanisms.

Main Methods:

  • Numerical simulation using the Smoothed Particle Hydrodynamics (SPH) algorithm in ANSYS/AUTODYN 17.0.
  • Verification of the Lee-Tarver model for describing reactive material detonation.
  • Comparative analysis of steel-coated PTFE/Al, steel-semi-coated PTFE/Al, and steel fragments impacting shielded charges.

Main Results:

  • The threshold impact velocity for both PTFE/Al composite fragments was 2.6 km/s, lower than the 2.7 km/s for steel fragments.
  • PTFE/Al fragments increased the duration and intensity of shock wave pulses in the explosive due to reactive energy release.
  • Composite fragments caused detonation through sustained pulse loads, while steel fragments initiated shock-to-detonation transition.

Conclusions:

  • PTFE/Al composite reactive fragments offer a lower initiation threshold for shielded charges compared to inert steel fragments.
  • The enhanced shock wave characteristics from reactive material energy release are key to initiating detonation.
  • Findings provide valuable scientific references for designing hypervelocity reactive fragments and understanding their damage mechanisms.