Abstract
The distribution of internal stress and temperature of explosive charge in launch environment is significant to determine the launch safety of explosive charge. PBX is composed of energetic particles, binder and metal powder, hence it can perform the viscoelastic mechanical properties under the external force loading condition. The generalized Maxwell constitutive equation is embedded into LS-DYNA program by secondary development technology, and verified rational after the simulation of launch safety experiment of explosive charge. Utilizing the constitutive equation and considering the influence of viscoelastic work and chemical reaction heat, the distribution of internal stress and temperature of explosive charge in launch environment is acquired. The results indicate that the viscoelastic work and chemical reaction heat produce a 4K highest temperature rise of explosive charge, the explosive charge without defects cannot ignite in the launch process. The results provide a certain guiding significance for the launch safety evaluation of explosive charge.
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