Mitigation of Blast Induced Acceleration using open cell natural rubber and Synthetic Foam

Sandhu, Inderpal Singh; Thangadurai, Murugan; Alegaonkar, P.S.; Saroha, D.R.

doi:10.14429/dsj.69.12586

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…Their experiment also verified reduction of reflected pressure from the explosion using foam retrofit [6]. Reductions of acceleration developed in structures due to blast effect using a foam retrofit was also reported in [7]. It was shown that acceleration reduction of up to 80% is possible.…”

Section: Introductionmentioning

confidence: 67%

Experimental Records from Blast Tests of Ten Reinforced Concrete Slabs

Mendonça¹,

Urgessa

Augusto³

et al. 2020

CivilEng

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The design and evaluation of structures subjected to blast loads has increased steadily since the 11 September 2001 terrorist attacks. While shock tube testing has filled some of the data gap by replicating blast waves in a controlled fashion, there is only scant field explosion data that is easily accessible for the structural engineering community for hypothesis testing or model validation. This paper summarizes experimental design, pre-test sensor verification, and data collection from 10 reinforced concrete slabs subjected to field explosions using a modest budget. The experimental record contains pressure, displacement, and acceleration measurements of each slab except in a few cases where the sensors have failed. The data is archived at George Mason Dataverse. Following detailed description of the experimental record for each slab, an example is provided in which the data can be utilized for finite element model verification.

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Section: Introductionmentioning

confidence: 67%

Experimental Records from Blast Tests of Ten Reinforced Concrete Slabs

Mendonça¹,

Urgessa

Augusto³

et al. 2020

CivilEng

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“…Curvature had three effects on the blast response of sandwich panels: it lowered the effective impulse imparted to the bottom plate, added a new failure mechanism of wrinkling, and added a new deformation regime with coupled circumferential bending and longitudinal stretching. Sandhu et al [32] investigated the mitigation of blast-induced acceleration by using add-on layers of polyurethanebased and rubber-based foams on a rigidly fixed composite plate under different blast loading intensities. The blast load was changed by varying the amount of C4 from 0.15 kg to 0.55 kg.…”

Section: Introductionmentioning

confidence: 99%

Blast Absorption Capacity of Brittle Mineral Foam: an Experimental Evaluation

Aminou,

Ben-Rhouma,

Belkassem

et al. 2023

hya

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Cellular materials, such as aluminum foam, have proven to be effective energy absorbents. They can be used as the crushable core for blast mitigation sacrificial cladding. In this paper insights into the blast response of a brittle mineral foam-based sacrificial cladding are presented. The experimental set-up used consists of a rigid steel frame (1000 mm × 1000 mm × 15 mm) with a square cavity of 300 mm x 300 mm in the center. An aluminum plate, representing the structure, with a total surface of 400 mm × 400 mm and a thickness of 2 mm is clamped into the steel frame. Two synchronized high-speed cameras in a stereoscopic configuration are used to capture the dynamic response of the aluminum plate at a frame rate of 20000 frames per second. The transient deformation fields are computed using a three-dimensional digital image correlation technique. The blast load is obtained by detonating 20 g of C4 placed at a distance of 250 mm from the center of the tested aluminum plate. The absorption capacity of the brittle mineral foam is assessed by comparing the out-of-plane displacement, the velocity, the acceleration and the major principal strain of the thin aluminum plate with and without the protective mineral foam. Two foam configurations with different thicknesses are considered: 60 mm and 120 mm. It is shown that adding the brittle mineral foam reduces the out-of-plane displacement together with the displacement velocity and acceleration of the aluminum plate at least by a factor of two. Post-mortem analysis of the foams shows that mitigation of the blast load in the present set-up and under the considered loading is partially obtained by crushing of the cell walls but mostly though the growth of cracks in the specimen.

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“…In the most common scenario, an explosion takes place under a vehicle, making its chassis responsible for the transfer of blast energy to the hull, and consequently, to the crew members. Various aspects of blast mitigation problems can be found in [3,4], where, for example, the authors of [5][6][7][8] focused on an optimal material design, while the authors in the following [9][10][11] studied the selection and geometric features of the panels. An advanced theoretical and experimental study of the oblique shock wave reflection phenomena [12] proved the potential advantages of geometrical barriers located on the propagation route of the blast wave in terms of momentum and energy transfer.…”

Section: Introductionmentioning

confidence: 99%

On the Blast Mitigation Ability of Multiple V-Shape Deflectors

Stanisławek

Morka

2020

Shock and Vibration

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This paper presents a 2D numerical study of v-shape deflectors subjected to high explosive charge detonation. The literature provides many papers concerning the appropriate geometry of blast protection deflectors. Such structures require a relatively high distance between the ground and the vehicle chassis. In most cases, the placement of a deflector is not possible or it cannot cover the whole area under a chassis. An interesting question that arises is to what extent a set of small deflectors would be able to mitigate blast effects. The content of this paper constitutes an answer to this question. Three analyses were conducted: (1) multiplication of triangle components, (2) effect of deflector size, and (3) geometry-induced shock dynamics. The problem was solved with the use of modelling and simulation methods, in particular, CFD-FEM implemented in the LS-DYNA code. It was considered a plain issue in computational fluid dynamics, where space discretization for each option was built with two-dimensional elements to ensure efficient calculations. Deflectors were described using a rigid wall boundary condition, and an adequate simplified detonation model was assumed. The primary measure of the results was reaction force history, with momentum transfer and pressure distribution maps considered supplementary. The studies performed showed that both minimizing the v-shape deflector size and surrounding it with adjacent structures had a negative impact on its blast mitigation effectiveness. However, for each multi-v-shape deflector, some improvement was present, and, therefore, in situations where the installation of a typical protector is not possible due to dimensional requirements, it may offer a compromise solution.

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Mitigation of Blast Induced Acceleration using open cell natural rubber and Synthetic Foam

Cited by 9 publications

References 1 publication

Experimental Records from Blast Tests of Ten Reinforced Concrete Slabs

Experimental Records from Blast Tests of Ten Reinforced Concrete Slabs

Blast Absorption Capacity of Brittle Mineral Foam: an Experimental Evaluation

On the Blast Mitigation Ability of Multiple V-Shape Deflectors

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