Predicting the response of plates subjected to near-field explosions using an energy equivalent impulse

Rigby, S.E.; Akintaro, O.I.; Fuller, B.; Tyas, A.; Curry, R.J.; Langdon, G.S.; Pope, D.J.

doi:10.1016/j.ijimpeng.2019.01.014

Cited by 56 publications

(49 citation statements)

References 26 publications

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“…The area-integrated impulses for Series C and D are similar (figure 4d), despite the distributions of specific impulse being considerably different. In this instance, it is clear that Series C-type loading would result in greater structural displacement than Series D-type loading [42,43], however, this would not be discernible if measuring total impulse only.…”

Section: Results and Discussion (A) The Influence Of Degree Of Confinmentioning

confidence: 86%

Characterisation of buried blast loading

et al. 2020

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While it is well known that detonation of shallow-buried high explosive charges generally results in above-surface loading which is greatly amplified compared with the same detonation in air, uncertainty persists as to the mechanisms leading to this effect. The work presented in this paper is a systematic investigation into the mechanisms of load transfer in buried blast events. This paper details the results from a parametric study into the mechanisms and magnitudes of load transfer following a shallow-buried explosion, where spatial and temporal load distributions are directly measured on a rigid surface using an array of Hopkinson pressure bars. In particular, the investigation has looked at the influence of both geometrical confinement and geotechnical conditions on the loading. The parametric study was separated into four main threads: the influence of physical confinement; gravimetric moisture content; stand-off distance and depth of burial; and soil material/particle size distribution. This study allows a direct observation of the contributions of each of these distinct parameters, and in particular the ability to discern how each parameter influences the temporal form and spatial distribution of the loading.

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Section: Results and Discussion (A) The Influence Of Degree Of Confinmentioning

confidence: 86%

Characterisation of buried blast loading

et al. 2020

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“…A detailed parametric study was conducted in Rigby et al (2019b) which aimed at investigating the relationship between plate deflection and energy equivalent uniform impulse. First, the experimental results from Rigby et al (2019a) were used to validate a new method for modelling blast loading in LS-DYNA: direct mapping of the experimentallymeasured specific impulse distribution (spline interpolant shown in Figure 1a) through assignment of initial velocities for each node on the plate.…”

Section: Energy Equivalent Uniform Impulsementioning

confidence: 99%

“…The two institutions began formally collabo-rating in early 2017 with a view to investigating and developing simplified analysis methods for calculating the response of blast loaded plates. This paper presents an update on the ongoing collaborative research effort (Rigby et al 2017, Rigby et al 2019a, Rigby et al 2019b).…”

Section: Introductionmentioning

confidence: 99%

Near-field blast loading and transient target response: A collaboration between Sheffield and Cape Town

Rigby¹,

Tyas²,

Curry³

et al. 2019

Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications

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“…The response of thin plates subjected to close-in detonations was studied by (Rigby et al, 2019a), using a combination of experimental, numerical, and analytical tools. Since the blast load duration in a close-in detonation event is expected to be short compared to the period of vibration of the structure, the dominant load parameter is the impulse.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the prediction of this parameter is essential for the comparison of the structural response between two different cases. In their study (Rigby et al, 2019a), a single type of explosive charge was studied (PE4). A motivation is raised from the previous information to study and assess the blast loading on plates in the nearfield regime, from different explosive types, but with the same mass and standoff distance.…”

Section: Introductionmentioning

confidence: 99%

TNT equivalency analysis of specific impulse distribution from close-in detonations

Grisaro

Edri

Rigby

2020

International Journal of Protective Structures

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Detonation of a high explosive close to a structural component results in a blast load that is highly localized and nonuninform in nature. Prediction of structural response and damage due to such loads requires a detailed understanding of both the magnitude and distribution of the load, which in turn are a function of the properties and dimensions of the structure, the standoff from the charge to the structure, and the composition of the explosive. It is common to express an explosive as an equivalent mass of TNT to facilitate the use of existing and well-established semi-empirical methods. This requires calculation of a TNT equivalency factor (EF), that is, the mass ratio between the equivalent mass of TNT and the explosive mass in question, such that a chosen blast parameter will be the same for the same set of input conditions aside from explosive type. In this paper, we derive EF for three common explosives: C4, COMP-B, and ANFO, using an equivalent upper bound kinetic energy approach. A series of numerical simulations are performed, and the resultant magnitudes and distributions of specific impulse are used to derive the theoretical upper bound kinetic energy that would be imparted to a flexible target. Based on the equivalent mass of TNT of each explosive, which is required to impart the same kinetic energy for a given target size and standoff distance as of TNT, the EF is calculated. It is shown that in the near-field, the EFs are non-constant and are dependent on both standoff and target size. The results in the current study are presented in a scaled form and can be used for any practical combination of charge mass, distance from the charge to the target, target size, thickness, and density.

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Predicting the response of plates subjected to near-field explosions using an energy equivalent impulse

Abstract: This is a repository copy of Predicting the response of plates subjected to near-field explosions using an energy equivalent impulse.

Cited by 56 publications

References 26 publications

Characterisation of buried blast loading

Characterisation of buried blast loading

Near-field blast loading and transient target response: A collaboration between Sheffield and Cape Town

TNT equivalency analysis of specific impulse distribution from close-in detonations

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