Studies on Scabbing of Solids Under Explosive Attack

1955 ◽  
Vol 22 (3) ◽  
pp. 317-323
Author(s):  
K. B. Broberg
Keyword(s):  
Shock Wave ◽  
Free Surface ◽  
High Pressures ◽  
Normal Incidence ◽  
Plane Shock ◽  
Detonation Pressure ◽  
Time Curve ◽  
Pressure Time ◽  
Administrative Service ◽  
Very High

Abstract The purpose of this paper is to analyze the mechanism of the scabbing phenomenon that occurs when an intense shock wave in a solid is reflected against a free surface. Only plane shock waves with normal incidence to the free surface are discussed. The shock wave is assumed to be initiated by the detonation of an explosive (especially TNT with a loading density of 1.5 g/cm3). The calculations are based upon values given by H. Jones and A. R. Miller (for the detonation pressure), D. J. McAdam (for the strength of the material at combined stresses), P. W. Bridgman (for the quantitative behavior of the material at very high pressures) and, finally, upon results from the author’s own experiments regarding the impulse and the pressure-time curve at detonation in contact with a metal surface. It is shown that fracture sometimes is likely to occur in several parallel layers of the material. Experiments have been performed which support the theoretical analysis. The research was carried out at the Royal Swedish Fortification and Works Administrative Service, Stockholm.

Jet produced by collapse of conical free surface of a metal by plane shock wave

Pramana ◽  
1983 ◽  
Vol 20 (6) ◽  
pp. 477-489 ◽  
Author(s):  
H S Yadav ◽  
S S Sachdeva ◽  
I J L Jaggi ◽  
C P S Tomar
Keyword(s):  
Shock Wave ◽  
Free Surface ◽  
Plane Shock Wave ◽  
Plane Shock

Shear Strength of Titanium Diboride under Shock Wave and Static Compressions

2010 ◽  
Vol 638-642 ◽  
pp. 1023-1028 ◽  
Author(s):  
Dattatraya P. Dandekar
Keyword(s):  
Mechanical Properties ◽  
Shock Wave ◽  
Shear Strength ◽  
Titanium Diboride ◽  
High Pressures ◽  
Recent Measurement ◽  
Plane Shock ◽  
Wave Compression ◽  
High Pressures And Temperatures ◽  
Shock Wave Compression

The mechanical behavior of ceramics under high pressures and temperatures is a subject of considerable interest. Since high pressures can be generated under static or dynamic conditions, it is necessary to measure mechanical properties of the materials under both. In the present work, compression and shear strength of titanium diboride measured under plane shock wave compression is revealingly compared with the recent measurement of compression and shear strength of titanium diboride obtained under static high pressures.

scholarly journals Investigating Different Grounds Effects on Shock Wave Propagation Resulting from Near-Ground Explosion

2019 ◽  
Vol 9 (17) ◽  
pp. 3639 ◽  
Author(s):  
Yan Wang ◽  
Hua Wang ◽  
Cunyan Cui ◽  
Beilei Zhao
Keyword(s):  
Shock Wave ◽  
Enhancement Effect ◽  
Liquid Propellant ◽  
Time Curve ◽  
Pressure Time ◽  
Launch Site ◽  
Propagation Law ◽  
Ground Shock ◽  
The Impact ◽  
Propellant Rocket

A massive explosion of a liquid-propellant rocket in the course of an accident can lead to a truly catastrophic event, which would threaten the safety of personnel and facilities around the launch site. In order to study the propagation of near-ground shock wave and quantify the enhancement effect on the overpressure, models with different grounds have been established based on an explicit nonlinear dynamic ANSYS/LS-DYNA 970 program. Results show that the existence of the ground will change the propagation law and conform to the reflection law of the shock wave. Rigid ground absorbs no energy and reflects all of it, while concrete ground absorbs and reflects some of the energy, respectively. Ground may influence the pressure-time curve of the shock wave. When the gauge is close to the explosive, the pressure-time curve presents a bimodal feature, while when the gauge reaches a certain distance to the explosive, it presents a single-peak feature. For gauges at different heights, different grounds may have different effects on the peak overpressure. For gauges of height not greater than 4 m, the impact on the shock wave is obvious when the radial to the explosive is small. On the contrary, as for the gauges of height greater than 4 m, the impact on the shock wave is obvious when the radial to the explosive is big. Ground has the enhancement effect on peak overpressure, but different grounds have different ways. For rigid ground, the peak overpressure factor is about 2. However, for the concrete and soil ground, peak overpressure factor is from 1.43 to 2.1.

Focusing of inertial particles after the shock-wave intersection point

2007 ◽  
Vol 5 ◽  
pp. 145-150
Author(s):  
I.V. Golubkina
Keyword(s):  
Shock Wave ◽  
Mass Concentration ◽  
Gas Flow ◽  
Intersection Point ◽  
Plane Shock ◽  
Inertial Particles ◽  
Dusty Gas ◽  
Focusing Effect ◽  
Aerodynamic Focusing ◽  
Particle Mass Concentration

The effect of the aerodynamic focusing of inertial particles is investigated in both symmetric and non-symmetric cases of interaction of two plane shock waves in the stationary dusty-gas flow. The particle mass concentration is assumed to be small. Particle trajectories and concentration are calculated numerically with the full Lagrangian approach. A parametric study of the flow is performed in order to find the values of the governing parameters corresponding to the maximum focusing effect.

scholarly journals Computational Evaluation of Shock Wave Interaction with a Cylindrical Water Column

2021 ◽  
Vol 11 (11) ◽  
pp. 4934
Author(s):  
Viola Rossano ◽  
Giuliano De Stefano
Keyword(s):  
Shock Wave ◽  
Water Column ◽  
Wave Interaction ◽  
Navier Stokes ◽  
Plane Shock ◽  
Governing Equations ◽  
Computational Evaluation ◽  
Air Water Interface ◽  
The Mean ◽  
The Impact

Computational fluid dynamics was employed to predict the early stages of the aerodynamic breakup of a cylindrical water column, due to the impact of a traveling plane shock wave. The unsteady Reynolds-averaged Navier–Stokes approach was used to simulate the mean turbulent flow in a virtual shock tube device. The compressible flow governing equations were solved by means of a finite volume-based numerical method, where the volume of fluid technique was employed to track the air–water interface on the fixed numerical mesh. The present computational modeling approach for industrial gas dynamics applications was verified by making a comparison with reference experimental and numerical results for the same flow configuration. The engineering analysis of the shock–column interaction was performed in the shear-stripping regime, where an acceptably accurate prediction of the interface deformation was achieved. Both column flattening and sheet shearing at the column equator were correctly reproduced, along with the water body drift.

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