Method for representing internal stress of TATB-based PBX under force-heat effect

Abstract

The invention discloses a method for representing internal stress of TATB-based PBX under a force-heat effect. The method for representing the internal stress of the TATB-based PBX under the force-heat effect comprises the following steps: loading mechanical stress / heat stress to the PBX in situ; using a neutron diffraction technology to obtain crystal lattice parameters of a TATB crystal so as toobtain relations between mechanical stress and a temperature and the crystal lattice parameters of the TATB; and meanwhile, using an internal microstructure representing technology to obtain a meso-structure of the PBX; obtaining a performance inflection point of the PBX by using the relations among the mechanical stress, the temperature and the crystal lattice parameters of the TATB and using the meso-structure; and finally, obtaining an internal TATB crystal response behavior rule of the PBX under the force-heat coupling effect. The method for representing the internal stress of the TATB-based PBX under the force-heat effect, disclosed by the invention, has the advantages that the neutron diffraction technology is introduced into the study field of energetic materials for the first time; lattice parameters, such as displacement, widening and asymmetry, of a TATB crystal diffraction peak in the PBX under the mechanical stress / heat stress is non-destructively observed in a non-invasive manner, so that basic parameters can be provided for macro-performance evaluation of the energetic materials.

Description

technical field [0001] The invention relates to a method for characterizing the internal stress of explosives, in particular to a method for characterizing the internal stress of TATB-based polymer bonded explosives under the action of force and heat. Background technique [0002] TATB (1,3,5-triamino-2,4,6-trinitrobenzene) is currently the only insensitive explosive approved by the US Department of Energy, because of its low mechanical and thermal sensitivity, it has good safety and stability. Polymer bonded explosive (PBX) based on TATB powder crystals (TATB powder crystals) has been widely used in the weapon industry at home and abroad, and researches on its structural safety performance, mechanical properties and detonation performance have been carried out at home and abroad. Always hot. [0003] TATB-based PBX is formed by granulating TATB explosive crystals and binders into TATB granules (TATB granules) with a certain particle size distribution by water suspension m...

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Problems solved by technology

[0005] (1) TATB has a planar molecular structure, and its crystal belongs to the triclinic system, which has a layered structure similar to graphite. There are strong hydrogen bonds between the TATB molecules in the same layer, which are tightly combined, and the interaction between different layers Very weak, this anisotropy complicates the response mechanism of the polycrystalline system

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