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Prediction of Deformation Behavior of PBX Simulant in a Warhead during High Speed Crash
2014.07.01 12:56
| 저자명 | Namsu Park, Chunghee Park, Hoon Huh, Jungsu Park |
|---|---|
| Name | 2014 KIMST Annual Conference |
| Year | 2014 |
| page |
This paper is concerned with
the prediction of deformation behavior of PBX (Polymer-Bonded eXplosive)
simulant during high speed crash. PBX is an energetic material in which small
explosive crystals are bonded in a polymer matrix occupying typically 5−10 % by
weight. PBX is used in a wide variety of weapon applications ranging from
rocket propellants to the main explosive charge in conventional munitions and
weapon systems. It is important to characterize the mechanical properties of
PBX and to accurately model their response behavior since unexpected external
stimuli could cause accidental detonation during manufacturing, transportation
or handling. When PBX is applied in a warhead system that undergoes severe
dynamic loading conditions during high speed crash, it is significant to
investigate the deformation behavior of PBX subjected to dynamic loads in order
to guarantee the safety of the warhead system before explosion. PBX in the
warhead system undergoes not only localized large deformation with high strain
rates induced by direct dynamic loads but also small deformation with low and
intermediate strain rates due to stress wave propagation. The strain hardening
behavior of PBX at quasi-static states, intermediate and high strain rates
should be considered to perform the design of the warhead system since PBX
undergoes deformation at a wide range of strain rates irregularly distributed
in PBX from quasi-static states to high strain rates. The deformation behavior
of PBX and its mechanical characteristic in the warhead were investigated using
finite element analysis, which includes the effect of various strain rates.
