Masahiko Otsuka, Eiji Hida, Kenji Kurogi, Mhamed Souli, and Shigeru Itoh
大塚誠彦，飛田栄治，黒木賢二，Mhamed Souli，伊東 繁
p.175-181
Abstract
In recent years, active research on explosives in exploring its effective use in the field of engineering is widely carried out. One way of instant initiation of explosive is by means of a metal wire explosion. The wire explosion technique generates plane shock waves produced by exploding parallel metal wire rows using a high voltage impulsive current. This method has been performed as mass shock compaction processing technology, such as shock synthesis of industrial diamond. The present study was undertaken to investigate the behavior of copper pipe by the detonation of PETN powder explosive initiated by metal wire explosion. This was carried out with the motivation to know the effect of PETN on the structure, which was detonated by metal wire explosion, and the detonation state of PETN. A copper wire exploded using metal wire explosion technique, was used to initiate the PETN filled in the copper pipe. The expansion process of the copper pipe by the detonation of PETN was evaluated by the optical observation using high-speed camera and the numerical analysis using LS-DYNA3D. The results on the expansion velocity of copper pipes showed a variation depending on the initiation and the amount of PETN used for the expansion.
金属細線爆発を利用した爆薬の起爆方法は，平面起爆，線起爆など多様な起爆への応用が可能である。本研究では，金属細線を銅パイプの中心軸上もしくは中心軸からある程度偏心させた軸上に配置し，銅パイプに充填されたPETN粉体爆薬を銅細線爆発によって瞬時起爆することで，爆薬が対象物へ及ぼす影響及び対象物の指向性について実験及び数値解析を行った。
PETNの薬厚によって発生する爆ごう圧力と爆ごうガスの量が変化するため，銅パイプの拡張に違いが生じた。銅パイプの初期拡張速度は爆ごうするPETNの薬厚と比例関係を示し，PETNの爆ごうエネルギーが銅パイプに作用した際に発生する反射波が拡張の収束速度に影響すると考察された。
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Keywords
Wire explosion, Initiation method, Multi-Material formulation, Fluid-Structure interaction
