Experimental Measurement of Specific Impulse Distribution and Transient Deformation of Plates Subjected to Near-Field Explosive Blasts
Reads0
Chats0
TLDR
In this article, the authors present a comprehensive experimental study into the loading acting on, and subsequent deformation of, targets subjected to near-field explosive detonations, and show that initial plate velocity profiles are directly proportional to the imparted impulse distribution, and that spatial variations in loading as a result of surface instabilities in the expanding detonation product cloud are significant enough to influence the transient displacement profile of a blast loaded plate.Abstract:
The shock wave generated from a high explosive detonation can cause significant damage to any objects that it encounters, particularly those objects located close to the source of the explosion. Understanding blast wave development and accurately quantifying its effect on structural systems remains a considerable challenge to the scientific community. This paper presents a comprehensive experimental study into the loading acting on, and subsequent deformation of, targets subjected to near-field explosive detonations. Two experimental test series were conducted at the University of Sheffield (UoS), UK, and the University of Cape Town (UCT), South Africa, where blast load distributions using Hopkinson pressure bars and dynamic target deflections using digital image correlation were measured respectively. It is shown through conservation of momentum and Hopkinson-Cranz scaling that initial plate velocity profiles are directly proportional to the imparted impulse distribution, and that spatial variations in loading as a result of surface instabilities in the expanding detonation product cloud are significant enough to influence the transient displacement profile of a blast loaded plate.read more
Citations
More filters
Journal ArticleDOI
Predicting the response of plates subjected to near-field explosions using an energy equivalent impulse
TL;DR: In this paper, a parametric analysis of the relationship between imparted load and peak and residual plate deformation is performed, and the energy equivalent impulse is derived, based on the theory of upper bound kinetic energy uptake introduced herein.
Journal ArticleDOI
Performances of the RC column under close-in explosion induced by the double-end-initiation explosive cylinder
TL;DR: In this paper, the axial load-carrying column is considered as the most critical component in RC structure, and the failure characteristics of the column under the combined action of axial loads and close-in explosion initiated at two ends of an explosive cylinder are investigated.
Journal ArticleDOI
Reflected Near-field Blast Pressure Measurements Using High Speed Video
TL;DR: In this paper, a non-intrusive method for measuring reflected blast pressure distributions using image analysis was developed to estimate the distribution of pressure loads acting on an obstacle following an explosive detonation.
Journal ArticleDOI
Spherical equivalence of cylindrical explosives: Effect of charge shape on deflection of blast-loaded plates
TL;DR: In this article, the authors developed an energy equivalent formulation to derive spherical equivalence factors, with the methodology illustrated for the scenario of a centrally detonated cylindrical explosive charge, and validated two-part numerical model was used to generate specific impulse distributions and quantify the resulting plate deformation, for a wide range of cylinear aspect ratios (0.20 ≤ L/D ≤ 5 ), at a range of near-field scaled distances ( 0.108 ≤ Z ≤ 0.485 ǫm/kg 1/3 ) for different sized structural targets.
Journal ArticleDOI
Predicting specific impulse distributions for spherical explosives in the extreme near-field using a Gaussian function
TL;DR: In this paper, the authors quantified the blast load arising from the detonation of a high explosive in transport security, infrastructure assessment, and defence applications, in order to design efficient and efficient systems.
References
More filters
Journal ArticleDOI
The Instability of Liquid Surfaces when Accelerated in a Direction Perpendicular to their Planes. I
TL;DR: In this article, it was shown that when two superposed fluids of different densities are accelerated in a direction perpendicular to their interface, this surface is stable or unstable according to whether the acceleration is directed from the heavier to the lighter fluid or vice versa.
Journal ArticleDOI
An Investigation of the Mechanical Properties of Materials at very High Rates of Loading
TL;DR: In this article, a method of determining the stress-strain relation of materials when stresses are applied for times of the order of 20 microseconds is described, using a modification of the Hopkinson pressure bar and detonators were used to produce large transient stresses.
Journal ArticleDOI
Determination of displacements using an improved digital correlation method
TL;DR: An improved digital correlation method is presented for obtaining the full-field in-plane deformations of an object by numerically correlating a selected subset from the digitized intensity pattern of the undeformed object.
Journal ArticleDOI
Instability of the interface of two gases accelerated by a shock wave
TL;DR: In this paper, an experimental study of the stability of the interface of two gases traversed by ash-wave was conducted and it was found that the interface is unstable both in the case of shock wave passage from the lighter to the heavier gas and for passage in the opposite direction.