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Related Concept Videos

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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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Related Experiment Video

Updated: Dec 21, 2025

Blast Quantification Using Hopkinson Pressure Bars
09:41

Blast Quantification Using Hopkinson Pressure Bars

Published on: July 5, 2016

9.4K

Characterisation of buried blast loading.

Sam Clarke1, Sam Rigby1, Steve Fay1

  • 1Department of Civil & Structural Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK.

Proceedings. Mathematical, Physical, and Engineering Sciences
|May 14, 2020
PubMed
Summary
This summary is machine-generated.

Detonating buried explosives amplifies surface loading. This study systematically investigated load transfer mechanisms and influencing factors like confinement and soil conditions for shallow-buried charges.

Keywords:
Hopkinson pressure barburied explosiveconfinementpressure distribution

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Area of Science:

  • Explosives engineering
  • Geotechnical mechanics
  • Shock wave physics

Background:

  • Detonation of shallow-buried high explosive charges significantly amplifies above-surface loading compared to air bursts.
  • The precise mechanisms driving this load amplification remain incompletely understood.

Purpose of the Study:

  • To systematically investigate the mechanisms and magnitudes of load transfer in shallow-buried explosion events.
  • To quantify the influence of geometrical confinement and geotechnical conditions on blast loading.

Main Methods:

  • Conducted a parametric study measuring spatial and temporal load distributions on a rigid surface using Hopkinson pressure bars.
  • Investigated four key parameters: physical confinement, gravimetric moisture content, stand-off distance/depth of burial, and soil material/particle size distribution.

Main Results:

  • Directly observed and quantified the contributions of individual parameters to load transfer.
  • Discerned how each parameter influences the temporal form and spatial distribution of the resulting blast loading.
  • Identified key factors governing amplified surface loading from buried explosions.

Conclusions:

  • The study provides critical insights into the complex load transfer mechanisms in shallow-buried explosions.
  • Understanding these mechanisms is vital for accurate prediction and mitigation of blast effects.
  • Geometrical and geotechnical factors significantly dictate the amplified blast loads observed above ground.