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Research Papers

High Strain Rate Behavior of Carbon Nanotubes Reinforced Aluminum Foams

[+] Author and Article Information
Abdelhakim Aldoshan

Mechanical and Aerospace
Engineering Department,
University of Missouri,
Columbia, MO 65211;
National Center for Nanotechnology,
KACST,
P.O. Box 6086,
Riyadh 11442, Saudi Arabia

D. P. Mondal

Advanced Materials and Processes
Research Institute (CSIR),
Bhopal 462064, India

Sanjeev Khanna

Mechanical and Aerospace
Engineering Department,
University of Missouri,
Columbia, MO 65211
e-mail: khannas@missouri.edu

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received September 27, 2016; final manuscript received July 20, 2017; published online September 13, 2017. Assoc. Editor: Harley Johnson.

J. Eng. Mater. Technol 140(1), 011011 (Sep 13, 2017) (10 pages) Paper No: MATS-16-1275; doi: 10.1115/1.4037657 History: Received September 27, 2016; Revised July 20, 2017

The mechanical behavior of closed-cell aluminum foam composites under different compressive loadings has been investigated. Closed-cell aluminum foam composites made using the liquid metallurgy route were reinforced with multiwalled carbon nanotubes (CNTs) with different concentrations, namely, 1%, 2%, and 3% by weight. The reinforced foams were experimentally tested under dynamic compression using the split Hopkinson pressure bar (SHPB) system over a range of strain rates (up to 2200 s−1). For comparison, aluminum foams were also tested under quasi-static compression. It was observed that closed-cell aluminum foam composites are strain rate sensitive. The mechanical properties of CNT reinforced Al-foams, namely, yield stress, plateau stress, and energy absorption capacity are significantly higher than that of monolithic Al-foam under both low and high strain rates.

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Figures

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Fig. 1

Closed-cell Al-foam composite: (a) low magnification cross-sectional view, the cell wall thickness is approximately 140–150 μm, (b) image showing cell structure, (c) cubical specimen used for high strain rate testing, and (d) magnified scanning electron microscope image showing CNT distribution in 1 wt % CNT sample

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Fig. 2

Distribution of foam cell size

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Fig. 3

A schematic description of in-house SHPB apparatus

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Fig. 4

Carbon nanotube reinforced closed-cell aluminum foam specimen sandwiched between incident and transmitted bars (circled region in Fig. 3)

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Fig. 5

Copper-pulsed shaper placed on the front surface of incident bar

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Fig. 6

Stress equilibrium of specimens with the use of copper pulse shaper: (a) no pulse shaper, (b) solid disk (no holes), (c) one hole, and (d) five holes

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Fig. 7

An example of the recorded SHPB strain pulses

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Fig. 8

Split Hopkinson pressure bar strain rate in specimen

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Fig. 9

Compressive stress–strain behavior under quasi-static condition of 2 wt % CNTs, closed-cell Al-foam

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Fig. 10

Compressive stress–strain behavior of closed-cell CNT reinforced Al-foam composite under (a) quasi-static loading and high strain rate loading with strain rates of (b) 1300 s−1, (c) 1800 s−1, and (d) 2200 s−1

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Fig. 11

Yield and plateau stresses as a function of CNTs concentrations

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Fig. 12

Yield and plateau stresses as a function of strain rate

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Fig. 13

Surface microstructure (a) is for 8 wt % SiC-2 wt % CNT at 20,000X and (b) for 7 wt % SIC-3 wt % CNT at 60,000X

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Fig. 14

Micrograph representing the deformation of 2 wt % CNT Al-foam at different strains: (a) 0% and (b) 5%

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Fig. 15

Energy absorption at 0.3 strain

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