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Yang Y.-D.,Nanjing University of Science and Technology | Li X.-D.,Nanjing University of Science and Technology | Wang X.-M.,Nanjing University of Science and Technology | Zhang L.-C.,CAEP - China Academy of Engineering Physics | Zhang M.-L.,China North Huaan Industry Group Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

The damage parameters of internal explosion in closed field were analyzed by using the dimension analysis principle, and the scale similarity model of internal explosion in closed field was established based on the similarity theory. The internal explosion according to the original model under seccessively incremental charging until structural damage and the scale model under critical charging of structural crack appearance with different scale coefficient values of 0.8, 0.6, 0.4, 0.2 and 0.1 respectively were simulated by using LS-DYNA code. The results show that, when the structure size maintains constant and the explosive quantity is changed, the arrival time of shock wave on the wall obeys similarity law; the shockwave overpressure also obeys similarity law when the wall is considered seperately and the effects of one wall, two walls and three walls were inspected respectively; however the impulse does not fit similarity law due to the influence of structural damage. The shockwave overpressure, scale pulse width T/Q-1/3 and scale impulse i/Q-1/3 on the wall in the scale model and original model obey similarity law when the scale coefficient is not less than 0.1, and the maximum relative errors of shockwave overpressure, scale pulse width and scale impulse between the scale model and original model are less than 3.3%, 4.96% and 5.1% respectively. As the scale coefficient decreases, the shockwave overpressure, scale pulse width and scale impulse on the wall show a discrete distribution and the similarity degree decreases gradually. So if the scale coefficient is within the scope of this study, it is feasible to predict the damage effect by the original model of internal explosion by using the results of scale mode experiments.


Yang Y.-D.,Nanjing University of Science and Technology | Li X.-D.,Nanjing University of Science and Technology | Wang H.,China North Huaan Industry Group Co. | Yin L.,China North Huaan Industry Group Co. | Ma Y.-P.,China North Huaan Industry Group Co.
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2013

To compare the blast power of a frag-demolition shell charged with TNT and RDX-based aluminized explosive RL-F detonated in the shallow soil, the processes of crater formed by the two kinds of charge explosives were numerically simulated by LS-DYNA code, and the bulging process of soil surface and final shape of crater were discussed. The results show that compared with the TNT, the bulging transverse size, bulging height and maximum bulging velocity of RL-F charges increase by 13.1%, 23.8% and 16% during the phases of bulging movement, respectively, and the final shape of crater shows that the crater diameter, depth and volume of RL-F charges increase by 11.5%, 34.3% and 54.5%, respectively. The blast power of the large calibre frag-demolition shell which charged with aluminized explosive RL-F can be improved greatly.

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