Numerical Modeling of Impact Initiation of High Explosives

Wu, C J ; Piggott, T ; Yoh, J ; Reaugh, J

Lawrence Livermore National Laboratory

关键词: Chemical Reactions;    Chemical Explosives;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Yield Strength;    Simulation;   

DOI  :  10.2172/973646
RP-ID  :  UCRL-TR-221760
RP-ID  :  W-7405-ENG-48
RP-ID  :  973646

美国|英语

来源: UNT Digital Library

【 摘 要 】

We performed continuum mechanics simulations to examine the behavior of energetic materials in Ballistic Chamber Impact (BIC) experiments, using an Arbitrary Lagrangian-Eulerian code (ALE3D). Our simulations revealed that interface friction plays an important role in inducing the formation of shear bands, which result in 'hot spots' for ignition. The temperature localization during BIC impact was found to be significant in materials with high yield strength. In those materials, there are multiple locations inside shear bands can achieve temperatures exceeding the threshold temperature for reaction. In addition, we investigated the relevant parameters influencing the pressure profile of a BIC test by numerical analysis from a simple phenomenological model. To our surprise, we found that the peaks of BIC pressure profiles not only can be a result of multi-center chemical reactions, but can also arise from factors associated apparatus configuration.