Low-density expanded perlite–aluminium syntactic foam

Taherishargh, M.; Belova, Irina V.; Murch, Graeme E.; Fiedler, Thomas

doi:10.1016/j.msea.2014.03.003

Cited by 104 publications

(138 citation statements)

References 57 publications

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“…Given that the load drops at yield are significantly smaller than those for "conventional" syntactic foams, as was shown in Figure 1, the energy absorption efficiencies are significantly higher and is similar to the behaviour reported in syntactic foams made with large weak perlite particles. [8] Preheating the mould at 600°C results in a significant reduction in the crush strength, removal of the load drop and the flatter stress-strain curve increases the energy absorption efficiency. The mechanical response for an equivalent porous Al sample is also shown.…”

Section: Figure 2 Force Required To Eject Castings From the Mould As mentioning

confidence: 99%

The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

Wright

Kennedy

2016

Adv Eng Mater

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Expanded glass particles (EGP) have been used to manufacture Al syntactic foams using a simple vacuum casting method. Clamping of the casting in the stainless steel mould was observed when preheating the mould to >400°C, causing damage to the EGP, resulting in a weaker foam but with the significant advantage of eliminating the yield drop, improving the energy absorption characteristics. The same effect in castings that were not clamped (for mould preheats < 400°C) could be achieved by quenching in liquid nitrogen. These "low strength" syntactic metal foams are a costeffective alternative to metal foams and porous metals (in terms of specific strength, stiffness and energy absorption) rather than "conventional" syntactic foams which contain smaller, stronger, hollow microspheres.

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Section: Figure 2 Force Required To Eject Castings From the Mould As mentioning

confidence: 99%

The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

Wright

Kennedy

2016

Adv Eng Mater

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“…The matrix material is usually an aluminium alloy (light and low cost), but nowadays high strength iron based matrices are also investigated [2][3][4][5][6][7][8][9][10][11]. As filler material, commercially available mixed-oxide ceramic [12][13][14][15], metallic [12] or SiC [16,17] hollow spheres are frequently applied, however Taherishargh et al have been made efforts for the application of low cost perlite filler as well [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

et al. 2015

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HighlightsLow pressure infiltration is suitable to produce MMSFs with hollow iron spheres.The MMSFs showed plastic yielding and long, slowly ascending plateau region.The matrix and the heat treatment strongly influence the properties of the MMSFs.The full-scale FEM model gives excellent agreement compared to the measured values. Highlights (for review) *Manuscript Click here to view linked References AbstractAluminium alloy syntactic foams reinforced with iron hollow spheres were produced by low pressure, liquid phase inert gas infiltration technique. Four Al alloys (Al99.5, AlSi12, AlMgSi1 and AlCu5) and Globomet grade iron hollow spheres were used as matrix and reinforcing material, respectively. The produced composite blocks were characterised according to the ruling standard for compression of cellular materials in order to ensure full comparability. The compressive test results showed plastic yielding and a long, slowly ascending plateau region that ensures large energy absorption capability. The proper selection of the matrix material and the applied heat treatment allows for a wide range of tailoring of the mechanical properties. For design purposes, the full-scale finite element method (FEM) model of the investigated foams was created and tested on Al99.5 matrix foams. The FEM results showed very good agreement with the measured values (typically within 5% in the characteristic properties and within 10% for the whole compression curve).

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“…A356 alloy has been used with expanded perlite particles to synthesize very low density (1.05 g/cm 3 ) syntactic foams. The plateau strength of as-cast and heat treated syntactic foams varied between 29 and 52 MPa [16]. A356/alumina hollow particle syntactic foams did not show strain rate sensitivity in compressive properties.…”

Section: Introductionmentioning

confidence: 91%

Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams

Cox

Luong

Shunmugasamy

et al. 2014

Metals

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Aluminum alloy A356 matrix syntactic foams filled with SiC hollow particles (SiCHP) are studied in the present work. Two compositions of syntactic foams are studied for quasi-static and high strain rate compression. In addition, dynamic mechanical analysis is conducted to study the temperature dependent energy dissipation and damping capabilities of these materials. The thermal characterization includes study of the coefficient of thermal expansion (CTE). A356/SiCHP syntactic foams are not strain rate sensitive as the compressive strength displayed little variation between the tested strain rates of 0.001-2100 s −1. Microscopic analysis of the high strain rate compression tested specimens showed that the fracture is initiated by the failure of hollow particles at the onset of the plastic deformation region. This is followed by plastic deformation of the matrix material and further crushing of particles. The syntactic foams showed decrease in storage modulus with increasing temperature and the trend was nearly linear up to 500 °C. The alloy shows a similar behavior at low temperature but the decrease in storage modulus increases sharply over 375 °C. The loss modulus is very small for the tested materials OPEN ACCESSMetals 2014, 4 531 because of lack of viscoelasticity in metallic materials. The trend in the loss modulus is opposite, where the matrix alloy has lower loss modulus than syntactic foams at low temperature. However, over 250 °C the matrix loss modulus starts to increase rapidly and attains a peak around 460 °C. Syntactic foams have higher damping parameter at low temperatures than the matrix alloy. Incorporation of SiCHP helps in decreasing CTE. Compared to the CTE of the matrix alloy, 23.4 × 10 −6 °C −1 , syntactic foams showed CTE values as low as 11.67 × 10 −6 °C −1 .

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Low-density expanded perlite–aluminium syntactic foam

Cited by 104 publications

References 57 publications

The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

The Processing and Properties of Syntactic Al Foams Containing Low Cost Expanded Glass Particles

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams

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