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Damage & Fracture of High-Explosive Mock Subject to Cyclic Loading

  • C. LIU
  • P. J. Rae
  • C. M. Cady
  • M. L. Lovato
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

We use four-point bend specimen with a single shallow edge notch to study the fracture process in Mock 900-21, a PBX 9501 high explosive simulant mock. Subject to monotonic loading we determine quantitatively the threshold load for macroscopic crack initiation from the notch tip. The four-point bend specimen is then subject to cyclic loading in such a way that during the first cycle, the applied force approaches but does not exceed the threshold load determined from the monotonic loading test and in the subsequent cycles, the overall maximum deformation is maintained to be equal to that of the first cycle. It is expected and is also confirmed that no macroscopic damage and cracking occur during the first cycle. However, we observe that sizable macroscopic crack is generated and enlarged during the subsequent cycles, even though the applied force never exceeds the threshold load. Details of the process of damage formation, accumulation, and crack extension are presented and the mechanical mechanism responsible for such failure process is postulated and discussed.

Keywords

Crack Initiation Cyclic Loading Digital Image Correlation Applied Force High Explosive 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© The Society for Experimental Mechanics, Inc. 2011

Authors and Affiliations

  • C. LIU
    • 1
  • P. J. Rae
    • 2
  • C. M. Cady
    • 1
  • M. L. Lovato
    • 1
  1. 1.Materials Science & Technology DivisionLos AlamosUSA
  2. 2.Weapons Experiments DivisionLos Alamos National LaboratoryLos AlamosUSA

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