Dynamic Behavior of Materials, Volume 1 by Jamie Kimberley Leslie Lamberson & Steven Mates

Author:Jamie Kimberley, Leslie Lamberson & Steven Mates
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Fig. 21.2Spherical RDX charge: (a) matching hemispherical charges (b) fully assembled 1.7-g spherical charges

Spherical cyclotrimethylene trinitramine Class 5 (C3H6N6O6; RDX Class V, 1.7 g weight) charges are composed of matching hemispherical charge and used to generate the primary blast. Each hemispherical charge has a nominal mass of 0.85 g and is pressed to a density of 1.77 g/cm3 (98.4% theoretical maximum density, TMD). Figure 21.2a shows matching hemispherical charges and Fig. 21.2b shows an assembled spherical charge of RDX. The spherical RDX explosive charge detonates 116 cm above the ground with RP-87 detonators.

Three piezoelectric high-frequency dynamic pressure sensors (ICP model 102A, PCB Piezotronics Inc., Depew, NY) were modified for underwater use and used to measure the shock wave pressure histories at a position of 2 cm above the cultured samples using a custom-designed pressure gauge holder. For cellular blast impact study, all pressure gauges were mounted on top of the cell culture plate with a custom-designed lid, submerged approximately 10.2 cm underwater, and positioned side-on to the blast wave direction. The caps were designed such that the pressures in different rows or columns of the well plate could be measured by moving the pressure sensors to the desired locations (Fig. 21.3a). For tissue slice blast impact study, all pressure gauges were mounted on top of the tissue sample bag, submerged in the aquarium approximately 10.2 cm under water, and positioned face-on to the blast wave direction (Fig. 21.3b). Two free-field air-blast pencil probes (model 137A23, PCB Piezotronics Inc., Depew, NY) were positioned in front of the aquarium to measure the free-field air-shock pressure before the shock wave entered the water medium Pressure-time history traces, peak overpressure, high speed images were recorded for each blast.

Fig. 21.3Blast-induced injury of cells: (a) Side–on pressure measurement setup, and (b) Face-on pressure measurement setup. Both (a) and (b) show the location of pressure sensors with samples submerged in aquarium tank before each test

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.