Abstract: The deformation response of thin steel plate subjected to the internal blast loading from hexanitrohexaazaisowurtzitane (CL-20)-based aluminized explosive charges was studied through a series of experiments. Circular steel plates as the sealing structure of a specially designed explosion vessel are subjected to internal blast loading. Aluminized explosives composed of a base of CL-20 with two kinds of charge masses (100 g/200 g) and three kinds of aluminum mass content (10%/20%/30%) were used for the internal explosion tests of the sealing steel plates. In addition, the results indicate that the energy released from the powdered aluminum at the later stage of its combustion can play a role in the deformation of steel plates, and the maximmum residual plastic deflection of sealing steel plates is determined by the effective impulse of initial blast shock wave, which is the positive phase impulse of initial shock wave. For the 200 g charge mass, when aluminum content is increased from 10% to 30%, the effective impulse of initial shock wave is decreased by 6.9% and 7.8%, respectively, and the degrees of deformation and damage of sealing steel plate are decreased accordingly, and the maximum residual deflection of steel plate is decreased by 5.3% and 7.5%, respectively. An engineering prediction model is established for predicting the maximum residual deformation deflection of sealing steel plate.

Key words: CL-20explosive, impulsiveloading, confinedvessel, energyreleasecharacteristic, circularsteelplate