Numerical Simulation Study On Constitutive Model With Damage Of Energetic Materials

Energetic materials are key materials in killing, destroying and power resource and widely used in nuclear and conventional weapon. It is a significative work to evaluate the viability and safety of the energetic materials in kinds of complex loading conditions. The damage in the energetic materials has important influence on the mechanical and detonation performance of the energetic materials. When studying the energetic materials using numerical simulation method, constitutive model with damage is much closer to the mechanical essential of the energetic materials. Base on the macroscopical property of the energetic materials, a constitutive model with damage, Visco-SCRAM, is developed and validated by numerical simulation. The main content can be summarized as:1.The literature review of constitutive models with damage of the energetic materials is conducted systematically and sufficiently. Based on the integrated consideration of macroscopical viscoelasticity and quasi-brittleness of the energetic materials, the general viscoelasticity model and microcrack damage model are coupled together to form a constitutive model with damage.2.Based on the constitutive model with damage which has been developed, a user-defined material model subroutine is finished. Using the interface that the LS-DYNA main program provides, the subroutine is implemented into LS-DYNA. A LS-DYNA solver which contains the constitutive model and can be generally used is compiled and built.3.The experiment, dynamic impact of confined PBX-9501 high explosive, is numerically simulated using LS-DYNA solver compiled and built. The comparison between the simulation result and experimental data shows that the quasi-planar displacement field in the simulation is coincident well with the one in the experiment. The result indicates that the constitutive with damage exhibits good veracity and validity in simulating the mechanical response of PBX in dynamic loading.