In high velocity penetration process of air-ground penetrating bombs,pre-initiation of charge (PBX explosive) seriously affects damage to targets. Aiming at this problem urgently needed to be solved,meso-damage modes and mechanism of PBX explosive were studied under high g-value loading. Based on the first stage light gas gun,a laser speed measurement system was used to monitor tested specimens’ speed to hit targets,piezoelectric sensors were used to collect stress states of tested specimens,and the damage form of PBX explosive was studied under Taylor impact loading. Based on the meso-damage theory,meso-damage modes of PBX explosive were analyzed using the scanning electronic microscope (SEM). The results showed that the shear de-bonding meso damage mode between crystal particles’ surface and binder firstly occurs under a smaller impact load; with increase in impact load energy,meso-damage cracks appear,and they spread rapidly along weak stress paths to produce new damage cracks,crack propagations are so complicated to cause particles broken,meso-damage modes,such as,trans-granular fracture and binder splitting happen to lead to occurrence of PBX explosive’s macroscopic damage cracks; the prediction results of PBX explosive’s meso-damage modes using the meso-damage theory of PBX explosive agree well with those of test analysis,the proposed PBX explosive’s meso-damage theory provides an important basis for studying its meso-damage mechanism.
Key words
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impact loading；PBX explosive；deformation failure；meso-damage
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