Blast resistance of stiffened sandwich panels with closed-cell aluminum foam

Goel, Manmohan Dass; Matsagar, Vasant; Gupta, Anil

doi:10.1590/s1679-78252014001300010

Cited by 18 publications

(7 citation statements)

References 25 publications

(44 reference statements)

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“…Figure 6 shows the compressive stress-strain curves of the samples produced with different processing parameters. According to figure 6, the compressive curves in all cases showed a typical stress-strain diagram with a division into three parts, a linear increase in stress mainly caused by elastic deformation, followed by a plateau caused by homogeneous plastic deformation and a final steep increase due to the collapse of the cells (densification region) [17,23,24]. Due to the strong bonding of copper particles in the sintering step, no sudden failure was observed during the compression test.…”

Section: Determination Of Linear Expansion Relative Density and Pormentioning

confidence: 94%

High porosity micro- and macro-cellular copper foams with semi-open cell microstructure toward its physical and mechanical properties

Saberi

Oveisi

2020

Mater. Res. Express

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Herein, a powder compacting method was developed to fabricate high porosity micro-and macrocellular copper foams using CaCO 3 space holder. The cold compacted precursors were heated at different temperatures under the nitrogen atmosphere. The effects of precursor compaction pressure, space holder content and sintering temperature on cell microstructure, relative density, compressive and physical properties were investigated. The scanning electron microscopy (SEM) images showed a uniform distribution of interconnected pores with sizes of pores and channels less than 50 microns formed the semi-open cell structure of the fabricated foams. The evaluation of the foaming agent content, 0 to 20 (wt%), in precursor materials showed relatively large changes in the porosity percentage (27%-50%), with the utilitarian strength (43 MPa) and densification strain (40%) of the copper foams. For specimens having 20 wt% CaCO 3 , tuning the sintering temperature (600°C) and compacting pressure (500 MPa) of precursors tailored superior porosity percent (47%), remarkable compressive stress (501 MPa) and high thermal (43.8 W m −1 .k), and electrical conductivity (0.06×10 8 Ω −1 m −1 ) owing to a desirable foaming process. A massive gas release during the CaCO 3 decomposition and the strengthened cell walls of the copper foams during the sintering resulted in the high porosity and strength of the fabricated foams. The presented fabrication method and our results are the core elements for the development of new high porosity metal foams that can help the development of the future application of copper foams for a long-life anode for lithium-ion batteries, catalysis, and thermal and electrical performances as electronic cooling materials.

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Section: Determination Of Linear Expansion Relative Density and Pormentioning

confidence: 94%

High porosity micro- and macro-cellular copper foams with semi-open cell microstructure toward its physical and mechanical properties

Saberi

Oveisi

2020

Mater. Res. Express

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“…The part of the energy that is absorbed by the face sheets is relatively high compared to panels with honeycomb or metallic foam core due to weaker energy absorption capability of the corrugated core. Study of the sandwich panel with metallic foam core is conducted in [28] and [29].…”

Section: Aluminium Platesmentioning

confidence: 99%

17.06: Characterization of accidental scenarios for offshore structures

2017

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Offshore structures are complex facilities whose malfunction can lead to serious impacts and losses, such as human lives, environmental disasters and the complete loss of the structure. Additionally, the cost associated to their construction and maintenance is very high, so it is crucial to keep them fully operational throughout their entire service life. Standby periods in offshore platforms generate large financial losses for their owners. The most devastating effects on offshore platforms are often the result of incidents which eventually lead to accidental actions. Hence it is very important to develop measures which limit the effects of accidental actions on the overall performance of these facilities. In this paper the most likely accidental scenarios and the strategies currently used to mitigate their devastating effects were analysed. Accidental scenarios were discussed based on the available historical data of incidents on offshore platforms, and classified according to the type of offshore platform or the type of structural elements affected. Furthermore, the most frequent hazards were used to introduce specific accidental actions which will then be the subject of a study for comparing the approaches proposed by different technical standards. The strategies currently used for mitigating the effect of accidental actions, both non-structural and structural, were classified according to the materials used and the structural typology adopted. The objective of this study was to identify new opportunities for the development of innovative mitigation strategies for the devastating effects associated to accidental actions in offshore platforms, considering the most recent developments in terms of innovative materials and of structural analysis approaches. In this context, this paper discusses the current trends in research and the future challenges related to this issue. This will serve to identify the possible methods for improvement of the existing structural mitigation measures.

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“…Many works have been performed to study the rate effect in the mechanical behavior of the metallic foams, such as the uniaxial failure stress, the plateau stress, the densification behavior and the energy absorption capacity (Zhao,1997;Deshpande and Fleck, 2000b;Demiray et al, 2006;Yu et al, 2006;Zhou et al, 2012aZhou et al, , 2012bZhou et al, , 2014Castroa et al, 2013;Alia et al, 2014;Goel et al, 2014;Wang et al, 2014;Kishimoto et al, 2014;Caprino et al, 2015;Storm et al, 2015;Su et al, 2015). Nevertheless, little literature has involved the experimental failure surface, especially the dynamic failure surface which is very important for the engineering applications of the metallic foams.…”

Section: Determination Of Dynamic Failure Surfacementioning

confidence: 99%

Impact Response of Aluminium Alloy Foams Under Complex Stress States

Zhou

Wang

et al. 2016

Lat. Am. j. solids struct.

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A series of dynamic tests were conducted on a closed-cell aluminum alloy foams in order to determine experimental failure surface under impact loading conditions. Quasi-static tests have also been performed to investigate failure mechanism under different stress paths. Three typical types of deformation modes can be observed, which corresponds to the different failure mechanism. The failure loci of the foam in principal stress plane are explored from quasistatic to dynamic loading conditions. A significant strength enhancement is identified experimentally. The expansion of the failure locus from the quasi-static to the dynamic test is almost isotropic. A modified failure criterion for the metallic foam is proposed to predict failure locus as a function of strain rate. This rate-dependence failure criterion is capable of giving a good description of the biaxial failure stresses over a wide range of the strain rates.

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Blast resistance of stiffened sandwich panels with closed-cell aluminum foam

Cited by 18 publications

References 25 publications

High porosity micro- and macro-cellular copper foams with semi-open cell microstructure toward its physical and mechanical properties

High porosity micro- and macro-cellular copper foams with semi-open cell microstructure toward its physical and mechanical properties

17.06: Characterization of accidental scenarios for offshore structures

Impact Response of Aluminium Alloy Foams Under Complex Stress States

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