Acoustic Emission (AE) technique has been demonstrated to be a valuable method for monitoring damage evolution of energetic materials under mechanical or thermal loads. In practice, both mechanical and thermal, the loading condition is normally very different or changed in wide range. In order to correctly understand AE features and damage evolution, it is very necessary to investigate the dependence of AE features on loading conditions. As an example, AE tests on Polymer Bonded Explosive (PBX) JOB-9003 specimens at different compressive loading rates have been done, and the dependence of AE features on compressive loading rate is revealed and discussed.
Intermolecular interaction of mononitrotoluenes (MNs) plasticizer with 2,4,6-trinitrotoluene (TNT) and 1,3,5-trinitrohexahydro-1,3,5-triazine (RDX) was experimentally and theoretically investigated. The basis set superposition error (BSSE) and interaction energy of TNT, RDX and plasticizers were computed at MP2/6-311++G** levels. Compared with the weak Einterbetween RDX and TNT (−1.586 kJ/mol), Einterbetween the o-nitrotoluene and TNT and RDX can increase to −131.557 kJ/mol and −48.487 kJ/mol, indicating there is strong intermolecular-interaction. SEM imagines also show that mononitrotoluene could form layered deposits in TNT and closely surround RDX crystalline. MD simulation results indicate that tensile modulus of (100) TNT and (100) RDX increases when introducing mononitrotoluene plasticizers separately, which agree with the experimental phenomenon of Brazilian disk test.
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