Investigation on the Explosive Characteristics and Damage Mode of Cylindrical Improvised Explosive Devices
W. Fan1,2, N. Zhou3, Q. Jiao1, J. Shi4, K. Tang5
1State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing, China
2Institute of Forensic Science Ministry of Public Security of PRC, Beijing, China
3Department of Criminal Science and Technology, Nanjing Forest Police College, Nanjing, China
4Lanpec Technologies Co. LTD, Lanzhou, China
5National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing, China
Keywords: improvised explosive device, natural fragment, explosive characteristic, damage mode, scene reconstruction
Abstract
To study the explosive characteristics of improvised explosive devices (IEDs), the damage mode of cylindrical IEDs and the formation mechanism of natural fragments under blast loading are investigated by using the ANSYS/AUTODYN 3D finite element code with Mott's stochastic failure model, as well as experiments of the hydraulic burst test and explosion test. The influence of the explosive charge amount and its position is also discussed. The main damage mode of the pressure container is the shearing damage, which is obviously affected by the explosive charge amount, charge position, and its power. The ability of the instantaneous function (pressurization rate) of the self-made explosive is far smaller than that of the standard explosive. Under the action of the self-made explosive, the closer to the detonation point, the smaller the size of the fragments formed.
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