Effects of Burn Rate on the Spatial Extent of Fracture Damage in an Underground Explosion (Postprint)

Abstract

The quasistatic micromechanical damage mechanics originally formulated by Ashby and Sammis has been made fully dynamical by the incorporation of physically motivated crack growth laws. This rate-dependent damage mechanics has been implemented in the ABAQUS dynamic finite element code and tested by simulating strength data for marble measured over a ten order of magnitude range of loading rates. The model is used here to explore the effect of burn rate (loading rate) on the spatial extent of fracture damage (and hence the elastic radius) and on the S waves generated by an underground explosion. The recent observation by that explosives with low burn rates produce more shear wave radiation than do those with high burn rates can be explained by dynamic fracture effects, and may not be due to gas wedging as originally hypothesized.

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Document Details

Document Type
Technical Report
Publication Date
Mar 22, 2012
Accession Number
ADA566773

Entities

People

  • Charles G. Sammis

Organizations

  • University of Southern California

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Air Force Research Laboratories
  • Crack Propagation
  • Cracks
  • Explosions
  • Explosives
  • Ground Based
  • Materials
  • Mechanics
  • Nuclear Explosions
  • Radiation
  • Secondary Waves
  • Stress Intensity Factors
  • Three Dimensional
  • Underground Explosions
  • Waves

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Rocket Propulsion.
  • Structural Health Monitoring of Composite Structures.