Simplified computation of reflective overpressure in closed cuboid space due to internal explosion |
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Authors: | TIAN Li LI Zhongxian ZHOU Qing |
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Institution: | 1. School of Civil Engineering, Tianjin University, Tianjin 300072, China 2. Binzhou Urban Planning and Design Institute, Binzhou 256600, China |
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Abstract: | A simplified method is proposed for analyzing the overpressure history of an optional point on the walls of a closed cuboid
due to its internal optional point-explosion. Firstly, the overpressure histories of all nodes on the walls of a cube with
a side-length of 2 m are computed under a reference-charge explosion at each node of its inner space using the LS-DYNA software,
and then are collected to form a reference database. Next, with the thought of the isoparametric finite element, an interpolating
algorithm is established to calculate the overpressure history of an optional point on the walls induced by an explosion at
any position inside this cubic space. Then, some ratio factors of peak values and durations of overpressure on the walls,
reflecting changes in the charge weight and side-length of a cuboid, are derived and applied subsequently, together with their
contributing coefficients, to make some modifications to the above algorithm, which achieves an approximate simulation to
the overpressure histories on the walls under the optional charge weight and cuboid size. Finally, example results verify
the rapidity and validity of this method, and provide feasible ranges of the charge weight and cuboid size according to the
current computing condition. |
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Keywords: | closed cuboid space reference database reflective overpressure charge weight |
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