2, 4-二硝基苯甲醚基不敏感熔注炸药动态力学性能

The dynamic mechanical properties of explosives are important to their stability. In order to reveal the dynamic mechanical properties of insensitive 2, 4-dinitroanisole (DNAN)-based melt-cast explosives, the dynamic behavior of an insensitive DNAN-based melt-cast explosive for penetrating warhead was investigated by split Hopkinson pressure bar experiment. The stress equilibrium and constant strain rate of the explosive materials with low impedance and low strength were achieved by using the pulse shaper technique in the SHPB test, and the stress-strain curves of the explosives at the strain rates of 65 s^-1, 130 s^-1 and 200 s^-1 were obtained. Based on the experimental data obtained, the Johnson-Cook constitutive model parameters for the explosive was proposed by an improved Lesuer's approach. The parameters of Johnson-Cook constitutive model are A=1.70 MPa, B=11.37 MPa, C=0.93, and n=0.49. The results show that the failure stress of the explosive increases with the increase in strain rate, and the explosive has significant strain rate effect. The Johnson-Cook constitutive model can be used to predict the mechanical responses of the explosive under impact load.