Abstract: |
In order to obtain the meso damage model and constitutive model of the detonator under impact load, based on the first level light gas gun, the multi axis impact damage experiment of JH 14C was designed to obtainthe stress history curves at different velocities. Scanning electron microscopy (SEM) was used to observe the microscopic morphology of the recovered samples. The results showed that the internal damage of JH 14C under multi axial impact was mainly trans granular fracture. The VUMAT was developed based on viscoelastic statistical crack model, and was inserted into ABAQUS to conduct numerical simulation of SHPB experiment. The validity of the model and parameters was verified by comparing the experimental results, and the multi axis impact test was further simulated to analyze the damage degree of JH 14C at different speeds, and the damage degree of JH 14C increases with the increase of velocity.The numerical simulation is in good agreement with the experimental results, indicating that the constitutive model can describe the mechanical properties of the explosive under different loading conditions. |