Explosive impulse on plates

Fourney, W.L.; Leiste, U.; Bonenberger, R.J.; Goodings, Deborah J.

doi:10.1080/13855140500125623

Cited by 30 publications

(17 citation statements)

References 1 publication

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“…Another situation where structure-explosive interaction must be considered is the response of structures to buried explosions [18][19][20][21]. In such circumstances, the interaction between the structure and the explosive products (e.g.…”

Section: Introductionmentioning

confidence: 99%

Identification of Interaction Pressure Between Structure and Explosive with Inverse Approach

Tiwari

Deng

et al. 2010

Exp Mech

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An inverse approach for the identification of the time-dependent localized interaction pressure between a structure and an explosive has been proposed and developed. In this approach, surface measurements of structural response (displacement and velocity) are integrated with numerical simulations to identify the spatial and time-dependent interaction pressure (i.e. the normal traction) on a structure surface. For verification and validation purposes, numerical simulations are used to (a) generate the time-dependent displacement and velocity fields on the free surface of the specimen at specified time intervals, (b) form a blast wave and compute the resulting interaction traction field between the structure and blast wave on the interaction interface for comparison to inverse predictions. In particular, validation of the proposed approach was performed using numerical simulation results for an underwater explosion, with excellent agreement between the identified interaction traction and the simulation generated interaction traction up to and including the maximum traction condition. To demonstrate the potential of the method, the proposed inverse procedure was employed to estimate the interaction traction field on a thin aluminum specimen subjected to transient pressure loading through detonation of explosive buried in sand.

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Section: Introductionmentioning

confidence: 99%

Identification of Interaction Pressure Between Structure and Explosive with Inverse Approach

Tiwari

Deng

et al. 2010

Exp Mech

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“…Numerical calculations Liu et al, 2013) have shown that this performance benefit is not related to a fluid-structure interaction effect as in the water blast problem, but arises from the higher bending stiffness and strength of sandwich structures compared to monolithic counterparts of equal mass per unit area. Experimental studies have also shown that increasing the stand-off distance between the target and the explosive/ground decreases the deflections of monolithic plates (Børvik et al, 2011;Fourney et al, 2005;Pickering et al, 2012) and sandwich panels . Traditionally, this decrease has been attributed to a reduction in the momentum transfer from the ejected soil and detonation products to the target due to the spherical expansion of the ejecta; see experiments of Hlady (2004) for rigid targets and Pickering et al (2012) for deformable plates.…”

Section: Introductionmentioning

confidence: 95%

The effect of inclination and stand-off on the dynamic response of beams impacted by slugs of a granular material

Uth

Wadley

Deshpande

2015

International Journal of Solids and Structures

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a b s t r a c tThe dynamic response of end-clamped sandwich and monolithic beams to impact by high-velocity tungsten carbide (WC) particle columns (slugs) has been measured with the aim of developing an understanding of the interaction of ejecta from a shallow-buried explosion with structures. The monolithic beams were made from stainless steel, while the sandwich beams of equal areal mass comprised stainless steel face sheets and an aluminium honeycomb core. High-speed imaging was used to measure the transient transverse deflection of the beams, to record the dynamic modes of deformation, and to observe the flow of the WC particles upon impact. The experiments show that sandwich beams deflect less than the monolithic beams both in normal and inclined impact situations. Moreover, the deflections of all beams in the inclined orientation were less than their respective deflections in the normal orientation at the same slug velocity. Intriguingly, the ratio of the deflection of the sandwich to monolithic beams remains approximately constant with increasing slug velocity for inclined impact but increases for normal impact; i.e. inclined sandwich beams retain their advantage over monolithic beams with increasing slug velocity. Dynamic force measurements reveal that (i) the momentum transferred from the impacting slug to both monolithic and sandwich beams is the same, and (ii) the interaction between the impacting particles and the dynamic deformation of the inclined monolithic and sandwich beams results in a momentum transfer into these beams that is equal to or greater than the momentum of the slug. These experimental findings demonstrate that contrary to intuition and widespread belief, the performance enhancement obtained from employing beam inclination is not due to a reduction in transferred momentum. Finally, we show that increasing the stand-off distance decreases beam deflections. This is because the slugs lengthen as they traverse towards their target and thus the duration of loading is extended with increasing standoff. However, combining increased stand-off with sandwich construction does not yield the synergistic benefits of sandwich construction combined with beam inclination.

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“…More recent methods, including those used by Espinosa et al [10,11], use laser interference and Moire patterns to determine time-resolved, three-dimensional material deformations and shapes. The optical technique evaluated by Siebert et al [12] and used by Fourney et al [13,14] and Tiwari et al [15] is capable of measuring time-resolved, three-dimensional surface shapes by using two high-speed digital cameras in stereo and digital image correlation software. This non-contact optical method is simple to implement and requires only optical access to the deforming surface, and thus is used in the present research.…”

Section: Introductionmentioning

confidence: 99%

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

Hargather

Settles

2009

International Journal of Impact Engineering

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Explosive impulse on plates

Cited by 30 publications

References 1 publication

Identification of Interaction Pressure Between Structure and Explosive with Inverse Approach

Identification of Interaction Pressure Between Structure and Explosive with Inverse Approach

The effect of inclination and stand-off on the dynamic response of beams impacted by slugs of a granular material

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

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