The Negative Phase of the Blast Load

Rigby, S.E.; Tyas, A.; Bennett, Terry; Clarke, Steve; Fay, Stephen

doi:10.1260/2041-4196.5.1.1

Cited by 80 publications

(69 citation statements)

References 22 publications

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“…This can be seen in the reflection coefficient plot in Figure 2(a) -the reflection coefficient is invariant of angle of incidence for θ ≤ 45° at small incident overpressures (i.e. those expected in tests [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Secondly, the tests in which the gauges were located at large angles of incidence (θ ≥ 45°) lie within a narrow band of scaled distances, over which the angle of incidence effects will be relatively constant.…”

Section: Resultsmentioning

confidence: 82%

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Angle of Incidence Effects on Far-Field Positive and Negative Phase Blast Parameters

Rigby

Fay

Tyas

et al. 2015

International Journal of Protective Structures

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Section: Resultsmentioning

confidence: 82%

“…Positive phase parameter predictions are taken directly from ConWep [4], and negative phase parameter predictions are taken from relationships developed by the current authors (Equations 3 and 4 in Ref. [9]). Both are based on data presented in UFC-3-340-02 [3].…”

Section: Resultsmentioning

confidence: 99%

Angle of Incidence Effects on Far-Field Positive and Negative Phase Blast Parameters

Rigby

Fay

Tyas

et al. 2015

International Journal of Protective Structures

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“…Spherical charge tests to reach the gauge location from the loaded face of the HPB. Aside from oscillations in the data caused by Pochhammer-Chree dispersion [51], the blast pressures appear to resemble the characteristic 'Friedlander' waveform [52], in that there is a sudden rise to peak pressure followed by an exponential decay back to ambient conditions, with recorded positive phase durations of ∼0.05-0.07 ms. As the blast event is located within the extreme near-field regime, negative phase effects are either negligible or non-existent [53]. Dispersion effects can be seen to 'round off' the leading edge of the stress pulse, with the peak pressure in the central (0 mm) bar occurring on the second oscillation, rather than with arrival of the stress pulse as is the case with all other bars.…”

Section: Direct Load Measurementsmentioning

confidence: 99%

Experimental Measurement of Specific Impulse Distribution and Transient Deformation of Plates Subjected to Near-Field Explosive Blasts

et al. 2018

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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 nearfield 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.

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“…Empirical predictions are also provided in this section, which were evaluated from UFC-3-340-02 [9] reflected positive and negative phase parameters assuming a TNT equivalence of 1.2 after Tyas et al [14,15]. The negative phase was constructed using the cubic approximation of Granström [30], after the validation work in Rigby et al [29].…”

Section: Reflected Pressure On a Semi-infinite Surfacementioning

confidence: 99%

A Numerical Investigation of Blast Loading and Clearing on Small Targets

Rigby

Tyas

Bennett

et al. 2014

International Journal of Protective Structures

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When a blast wave strikes a finite target, diffraction of the blast wave around the free edge causes a rarefaction clearing wave to propagate along the loaded face and relieve the pressure acting at any point it passes over. For small targets, the time taken for this clearing wave to traverse the loaded face will be small in relation to the duration of loading.Previous studies have not shown what happens in the late-time stages of clearing relief, nor the mechanism by which the cleared reflected pressure decays to approach the incident pressure. Current design guidance assumes a series of interacting clearing waves propagate over the target face -this assumption is tested in this article by using numerical analysis to evaluate the blast pressure acting on small targets subjected to blast loads. It is shown that repeat propagations of the rarefaction waves do not occur and new model is proposed, based on an over-expanded region of air in front of the loaded face of the target.

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The Negative Phase of the Blast Load

Cited by 80 publications

References 22 publications

Angle of Incidence Effects on Far-Field Positive and Negative Phase Blast Parameters

Angle of Incidence Effects on Far-Field Positive and Negative Phase Blast Parameters

Experimental Measurement of Specific Impulse Distribution and Transient Deformation of Plates Subjected to Near-Field Explosive Blasts

A Numerical Investigation of Blast Loading and Clearing on Small Targets

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