Laboratory-scale techniques for the measurement of a material response to an explosive blast

Hargather, Michael; Settles, Gary S.

doi:10.1016/j.ijimpeng.2008.12.008

Cited by 23 publications

(13 citation statements)

References 24 publications

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“…Whilst this information may enable researchers to develop relationships between basic parameters, it is often more desirable for validation of numerical modelling approaches to have a more detailed description of the transient displacement profile of the plate. Digital image correlation (DIC) was first introduced in 1983 [28] and has recently been used to more accurately study fullfield transient deformations of blast loaded plates [29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Literature Reviewmentioning

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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Section: Literature Reviewmentioning

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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“… investigated the resistance of GFRP sandwich panels and laminated tubes to blast in air and underwater environments using high‐speed photography and the DIC method. The DIC method was also employed to study dynamic processes under impact loading in other literatures .…”

Section: Introductionmentioning

confidence: 99%

“…The instrumentation difficulties and prohibitive cost of large‐scale blast testing often result in limited experiments and even more limited data. Although not able to completely replace full‐scale testing, laboratory‐scale experiments nonetheless provide unique data collection opportunities and new insights into the physical phenomena . This paper presents a laboratory‐scale experimental system consisting of a confined cylinder vessel and a high‐speed photography system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Deformation of Clamped Circular Plates Subjected to Confined Blast Loading

Chen

Liu

Ding

et al. 2016

Strain

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In this paper, the dynamic deformation of thin metal circular plates subjected to confined blast loading was studied using highspeed three-dimensional Digital Image Correlation (3D DIC). A small-scale confined cylinder vessel was designed for applying blast loading, in which an explosive charge was ignited to generate blast loading acting on a thin metal circular plate clamped on the end of the vessel by a cover flange. The images of the metal plates during the dynamic response were recorded by two high-speed cameras. The 3D transient displacement fields, velocity fields, strain fields and residual deformation profiles were calculated by using 3D DIC. Some feature deformation parameters including maximum out-of-plane displacement, final deflection, maximum principal strain and residual principal strain were extracted, and the result was in good agreement with that simulated by AUTODYN. A dimensionless displacement was introduced to analyse the effects of plate thickness, material types and charge mass on the deflection of metal plates. DIC is also proven to be a powerful technique to measure dynamic deformation under blast loading.

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“…Digital image correlation (DIC) has been used to study the full-field dynamic deformation of plates [14,15,16,17,18,19]. DIC uses two high-speed video (HSV) cameras filming in stereo to gain a 3-dimensional perspective of the subject of interest.…”

Section: Introductionmentioning

confidence: 99%

Displacement timer pins: An experimental method for measuring the dynamic deformation of explosively loaded plates

Fay

Rigby

Tyas

et al. 2015

International Journal of Impact Engineering

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The measurement of dynamic deformation of an explosively loaded plate is an extremely onerous task. Existing techniques such as digital image correlation are expensive and the equipment may be damaged by explosively driven debris/ejecta, particularly if it is necessary to locate such equipment close to loaded elements which are likely to fail. A new, inexpensive and robust measurement technique for use in full-scale blast testing is presented, which involves the placement of displacement timer pins (DTPs) at pre-defined distances from the rear surface of the centre of a plate. A strain gauge on the perimeter of each pin records the time at which the plate comes into contact with the end of each DTP and hence has deformed to that value of displacement, giving a direct measure of the time-varying deformation at a discrete point on the plate. An experimental proof-of-concept was conducted and the results are compared with numerical displacements determined using LS-DYNA. The numerical and experimental results were in very good agreement, which suggests that the proposed experimental method offers a valuable means for determining the full-scale response of structures subjected to blast loads in aggressive environments. Further improvements to the experimental procedure are outlined, along with applications where the DTPs are particularly suited.

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Laboratory-scale techniques for the measurement of a material response to an explosive blast

Cited by 23 publications

References 24 publications

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

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

Dynamic Deformation of Clamped Circular Plates Subjected to Confined Blast Loading

Displacement timer pins: An experimental method for measuring the dynamic deformation of explosively loaded plates

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