Abstract
An experimental apparatus was designed to study the non-shock initiation reaction evolution process of a HMX (cyclotetramethylenete-tranitramine)-based pressed PBX (Plastic Bonded Explosive)-A column under the main constraint of the inertial mass of the explosive bulk, with strong bottom and circumferential confinements and with the strength of a PMMA plate cover as the threshold to control the internal reaction pressure. The HMX-based pressed PBX-A column was ignited by black powder. The experimental results show that the reaction violence was quite mild, and the estimated amount of explosive consumed at the time of the PMMA plate cracking was only 1.8% of the thickness. The velocity curve of the constrained surface shows that the internal reaction pressure at the initial stage of the structural deformation shows the “quasi-isobaric” characteristic, and the estimated reaction pressure at this stage was about 157.41 MPa.
Highlights
The results show that the main characteristic mechanism of non-shock initiation reaction evolution is the laminar combustion of explosive surface, flow of reaction products along the structural seam, coupling of the response deformation of charge constrained structure, and the explosive reaction
The results show that for the reaction products in the bulk cracks of the explosive, the unreacted explosive bulk becomes a generalized structural confinement, so the mechanical scitation.org/journal/adv properties of the explosive bulk may be the factors influencing the reaction evolution of the explosives
The explosive bulk and the PMMA plate are driven by the reaction product gas as inertial mass confinement and structural confinement, respectively, and maintain approximately a constant acceleration of about 500 μs, which indicates that the local “quasi-isobaric” state is maintained in this process
Summary
The reaction of low porosity dense explosive with confinement, which is under the conditions of friction and low velocity impact that is not directly initiated by shock wave, is defined as non-shock initiation reaction. The results show that the main characteristic mechanism of non-shock initiation reaction evolution is the laminar combustion of explosive surface, flow of reaction products along the structural seam, coupling of the response deformation of charge constrained structure, and the explosive reaction.. The reaction of low porosity dense explosive with confinement, which is under the conditions of friction and low velocity impact that is not directly initiated by shock wave, is defined as non-shock initiation reaction.. The results show that the main characteristic mechanism of non-shock initiation reaction evolution is the laminar combustion of explosive surface, flow of reaction products along the structural seam, coupling of the response deformation of charge constrained structure, and the explosive reaction.. To study the non-shock initiation reaction evolution process of HMX (cyclotetramethylenete-tranitramine)-based pressed explosive PBX (Plastic Bonded Explosive)-A under the main constraint of inertial mass of explosive bulk, an experimental apparatus as shown in Fig. 1 was designed, with strong bottom and circumferential confinements and with the strength of a PMMA plate cover as the threshold to control the internal reaction pressure. High-speed photography, multi-channel Photonic Doppler Velocimetry (PDV), and free field blast pressure probes were conducted to record the parameters of reaction evolution process for detailed and overall analysis
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