Study on the damage law of the shape of the near range explosive charge on the plate frame structure

DOI:	10.11809/bqzbgcxb2024.04.005
Keywords:	near distance explosion;shape of charge; plate frame structure; regularity of damage; numerical simulation
Abstract:	In order to study the influence of the length diameter ratio of cylindrical charge on the deformation damage of the plate frame structure during close explosion, a typical reduced plate frame structure was taken as the research object, and the effects of five different length diameter ratio charge explosions on the plate frame deformation damage were analyzed by using the experimentally verified finite element model, and the difference between the two cases where the angle between the charge column and the plate frame was 0° and 90° was compared and analyzed. The results show that with the increase of the aspect ratio of the charge, the overpressure and impulse of the shock wave reflection gradually decrease when the angle is 90°, and the overpressure and impulse of the shock wave reflect gradually increase when the angle is 0°, and the high pressure area gradually moves from the axis of the charge to the radial direction. When the aspect ratio of charge increases, the residual displacement of the target plate gradually decreases when the angle is 90°, and the displacement gradually increases when the angle is 0°. Based on the maximum residual displacement D of the center point of the plate frame, the axial equivalent shape factor β1 and the radial equivalent factor β2 when the angle between the axis of the column and the surface of the target plate is 90° and 0°, and the prediction error is less than 15% when the proportional distance is in the range of 0.4~0.7 m/kg 1/3 , which can better predict the residual displacement of the center point of the plate frame under different charge length diameter ratios and obtain the damage level of the structure.
Issue:	Vol. 45 No. 4 (2024)
Published:	2024-04-30
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