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|저자명||Namsu Park, Chunghee Park, Hoon Huh, Jungsu Park|
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.