Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (8): 1977-1982.doi: 10.3866/PKU.WHXB201604293

• ARTICLE • Previous Articles     Next Articles

Molecular Dynamics Simulations of Femtosecond Laser Ablation of Energetic Materials

Zhen YANG1,Hai LIU2,Yuan-Hang HE1,*()   

  1. 1 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, P. R. China
    2 Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan Province, P. R. China
  • Received:2016-04-19 Published:2016-07-29
  • Contact: Yuan-Hang HE E-mail:heyuanhang@bit.edu.cn

Abstract:

To understand the physical and chemical responses of energetic materials, such as 1, 3-dinitrobenzene (DNB, C6H4N2O4), hexanitrohexaazaisowurtzitane (CL20, C6H6N12O12), and CL20/DNB co-crystal, to femtosecond laser ablation (FLA), their molecular reaction dynamics have been investigated using the ReaxFF/ lg force field. The computational results indicate that the temperature and pressure of the CL20/DNB system jump during FLA. In particular, the temperature and pressure gradually reach their maxima following an initial cooling process. N―NO2 bond breaking of the CL20 molecule triggers the reactions for both the CL20 and CL20/ DNB systems. However, the CL20 system prevails the CL20/DNB co-crystal in the decomposition rate simply because coexistence of DNB molecules in the mixture and generated decomposition products containing benzene rings greatly reduce the effective collision probability between CL20 and the products.

Key words: Femtosecond laser, CL20/DNB co-crystal, ReaxFF/lg, Reaction mechanism, Molecular dynamics

MSC2000: 

  • O643