Dynamic Behaviour of Foams and Sandwich Panels under Shock Wave Loading

Reddy, Chetan; Madhu, V.

doi:10.1016/j.proeng.2016.12.260

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…The 3D CT images confirm that densification occurs towards the far end of the foam because the exit face is fully supported by the rigid end-wall (but for the cavity part). Unlike the observation of reference [13], no disintegration of the central portion of the foam nor radial cracks around the disintegrated region were observed in the foams after the tests, possibly because the foams were fully supported in the present work, as opposed to being simply supported in the referred work.…”

Section: Resultscontrasting

confidence: 80%

“…2020, 10, x FOR PEER REVIEW 6 of 9 densification occurs towards the far end of the foam because the exit face is fully supported by the rigid end-wall (but for the cavity part). Unlike the observation of reference [13], no disintegration of When the incident shock wave reflects off the surface of the foam, a compaction wave is generated in the foam. The compaction wave, on reaching the end of the foam, reflects off the endwall, generating pressure/stress on the end-wall flange.…”

Section: Resultsmentioning

confidence: 63%

“…The shock speed used was greater than Mach 2 while the incident pressure was 3.5 bar, which gives reflected pressures of about 10 bar. Reddy et al [13] showed that, for higher values of reflected pressure (52 and 69 bar), radial cracks and core crushing occurred in simply supported closed cell aluminum foams. Kazemi-Kamyab et al [14] studied interactions between shock and open porous aluminum foam in the elastic loading range (with ~3.5 bar incident shock pressure) and showed shock attenuation in foams.…”

Section: Introductionmentioning

confidence: 99%

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Shock Loading of Closed Cell Aluminum Foams in the Presence of an Air Cavity

et al. 2020

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It is important to protect assets located within cavities vulnerable to incident shock waves generated by explosions. The aim of the present work is to explore if closed cell aluminum foams can mediate and attenuate incident shocks experienced by cavities. A small cavity of 9 mm diameter and 2 mm length was created within the steel end-wall of a shock tube and exposed to shocks, directly or after isolating by aluminum foam liners. Shock waves with incident pressure of 9–10 bar travelling at a velocity of 1000–1050 m/s were generated in the shock tube. Compared to the no-foam condition, the pressure induced in the cavity was either equal or lower, depending on whether the foam density was low (0.28 g/cc) or high (0.31 to 0.49 g/cc), respectively. Moreover, the rate of pressure rise, which was very high without and with the low density foam barrier, reduced substantially with increasing foam density. Foams deformed plastically under shock loading, with the extent of deformation decreasing with increasing foam density. Some interesting responses such as perforation of cell walls in the front side and densification in the far side of the foam were observed by a combination of scanning electron microscopy and X-ray microscopy. The present work conclusively shows that shocks in cavities within rigid walls can be attenuated by using foam liners of sufficiently high densities, which resist densification and extrusion into the cavities. Even such relatively high-density foams would be much lighter than fully dense materials capable of protecting cavities from shocks.

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Section: Resultscontrasting

confidence: 80%

Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

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Shock Loading of Closed Cell Aluminum Foams in the Presence of an Air Cavity

et al. 2020

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“…Reddy et al [10] investigated the behavior of composite sandwich panels against different shock loads to report the fabrication of sandwich panels using E-glass-epoxy composite face sheet and aluminum foam. Also, failure behavior of aluminum foam and sandwich material were studied [10]. Ruan et al [11] designed experimental equipment to examine the forming of magnesium alloy in cold working using underwater shock waves.…”

Section: Introductionmentioning

confidence: 99%

Deformation of Stacked Metallic Sheets by Shock Wave Loading

Patil

Murkute

Shirafkan

et al. 2018

Metals

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The focus of the present work is to develop a deep understanding of deformation of stacked metal sheets with a series of different sequences by using shock wave loading. Here, experimental and numerical investigations of deformation of a single metal sheet of 1.5-mm and the stack of three metal sheets of 0.5-mm thickness of aluminum (Al), copper (Cu) and brass (Br) material were carried out. In the shock wave experiments, helium was used as the driving gas to produce a strong shock wave. Finite elements method (FEM) simulations on 3D-computational models were performed with explicit dynamic analysis, and Johnson-Cook material model was used. The obtained results from experiments of the outer diameter, thickness distribution, and dome height were analyzed and compared with the numerical simulations, and both the results are in excellent agreement. Moreover, for the same pressure load, due to lower inter-metallic friction in the stacked sheets compared to a cohesive property of the single sheet, an excellent deformation of stacked metallic sheets was observed. The results of this work indicated that the shock wave-forming process is a feasible technique for mass production of stacked metallic sheets as well as fabricating a hierarchical composite structure, which provides higher formability and smooth thickness distribution compared to a single material.

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“…When an explosion occurs near a foam cladded reinforced concrete member, the foam layer compresses and absorbs a large amount of energy and offers protection for the members against blast loads [8].…”

Section: Introductionmentioning

confidence: 99%

The Numerical Investigation of Aluminum Foam-protected Reinforced Concrete Slabs under Blast Loading Using AUTODYN-3D

2018

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Aluminum foam is a lightweight material with high energy absorption capacity. In this study A Nonlinear three-dimensional hydrocode numerical simulation was carried out using autodyn-3d, which is an extensive code dealing with explosion problems. In this simulation, a high explosive material (comp B) is blasted against several concrete panels. The model was first validated using experimental tests carried out by Chengqing and has shown good results. Several numerical tests were carried out to study two parameters that affect the deflection of reinforced concrete panels. The parameters included are the thickness of concrete target and the thickness of steel plate. The results showed that increasing the thickness of the steel plate has an insignificant effect on the deflection of the reinforced concrete target while increasing the thickness of the concrete panel has a significant effect on the deflection of the concrete target.

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Dynamic Behaviour of Foams and Sandwich Panels under Shock Wave Loading

Cited by 12 publications

References 15 publications

Shock Loading of Closed Cell Aluminum Foams in the Presence of an Air Cavity

Shock Loading of Closed Cell Aluminum Foams in the Presence of an Air Cavity

Deformation of Stacked Metallic Sheets by Shock Wave Loading

The Numerical Investigation of Aluminum Foam-protected Reinforced Concrete Slabs under Blast Loading Using AUTODYN-3D

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