Citation: ZHOU Ting-Ting, SONG Hua-Jie, HUANG Feng-Lei. The Slip and Anisotropy of TATB Crystal under Shock Loading via Molecular Dynamics Simulation[J]. Acta Physico-Chimica Sinica, ;2017, 33(5): 949-959. doi: 10.3866/PKU.WHXB201702152 shu

The Slip and Anisotropy of TATB Crystal under Shock Loading via Molecular Dynamics Simulation

1.
Institute of Applied Physics and Computational Mathematics, Beijing 100094, P. R. China;
2.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, P. R. China

Received Date: 10 October 2016
Revised Date: 13 February 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (11402031, 11372053, 11221202).

The slip and anisotropy of 2,4,6-triamino-1,3,5-trinitrobenzene (TATB) crystal under shock loading along various directions were investigated using molecular dynamics simulation combined with reactive force field (ReaxFF). The shock strength was approximately 10 GPa, and seven shock orientations normal to the (101), (111), (011), (110), (010), (100), and (001) crystal planes were considered. For these shock directions, the slip systems that are likely to be activated are predicted to be on the {001} plane, whereas others that could not be activated exhibit large shear stress barriers. These slip characteristics are consistent with the layered structure of TATB crystal along the c axis and the planar structure of TATB molecule. The most favorable slip systems are suggested to be (101)/{001}<100>, (111)/{001}<010>, (011)/{001}<010>, (110)/{001}<010>, (010)/{001} <110>, (100)/{001}<120>, and (001)/{001}<010>. TATB crystal exhibits anisotropic response to shock loading, that is, the shear stress, energy, temperature, and chemical reactivity during shear deformation depend on shock direction. For the (100) and (001) shock planes, the shear stress barrier is relatively high and lasts for a long time, leading to fast energy accumulation and temperature increment, which, in turn, increase the chemical reactivity. In contrast, for the (101) and (111) shock planes, the small shear stress barrier results in slow energy accumulation and temperature rise and, thus, low chemical reactivity. The (011), (110), and (010) shock planes exhibit intermediate responses. The sensitivity of the seven shock planes can be ranked as follows: (101), (111) < (011), (110), (010) < (100), (001). This study provides microscale insight into the response mechanisms and structure-property relationship of TATB crystal under dynamic loading and may facilitate designing explosives with high energy but low sensitivity.
- TATB,
- Shock,
- Slip,
- Anisotropy,
- ReaxFF,
- Molecular dynamics
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沈阳化工大学材料科学与工程学院沈阳 110142