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Research Papers

High Strain Rate Behavior of Graphene Reinforced Polyurethane Composites

[+] Author and Article Information
Sanjeev K. Khanna, Ha T. T. Phan

Mechanical and Aerospace
Engineering Department,
University of Missouri,
Columbia, MO 65211

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 6, 2014; final manuscript received October 9, 2014; published online December 23, 2014. Assoc. Editor: Ghatu Subhash.

J. Eng. Mater. Technol 137(2), 021005 (Apr 01, 2015) (10 pages) Paper No: MATS-14-1125; doi: 10.1115/1.4029291 History: Received June 06, 2014; Revised October 09, 2014; Online December 23, 2014

A compressive split Hopkinson pressure bar (SHPB) was used to investigate the dynamic mechanical behavior of graphene (GR) reinforced polyurethane (PU) composites (GR/PU) at high strain rates ranging from approximately 1500 s−1 to 5000 s−1. Four types of GR/PU composites with different GR contents: 0.25% GR, 0.5% GR, 0.75% GR, and 1% GR were prepared by the solution mixing method and divided into two groups of unheated and postheated specimens. Experimental results show that the GR/PU composite is a strong strain rate dependent material, especially in the high strain rate regime of 3000 s−1–5000 s−1. The dynamic mechanical properties of GR/PU composite in terms of plateau stress, peak stress, and peak load carrying capacity are better than that of pristine PU at most of the applied strain rates. Among the four different GR concentrations used, the 0.5 wt.%-GR specimen shows the highest peak stress, and the 1 wt.% GR specimen has the highest plateau stress; while no significant change in peak strain with changing GR weight fraction was observed. Compared to unheated specimens, the plateau stress, peak stress, and peak strain of postheated specimens are significantly higher.

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References

Figures

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Fig. 1

Schematic of compression SHPB setup

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Fig. 2

Test results with unheated 1 wt.% GR PU composite specimens with annealed copper shaper (a), (c), (e) and un-annealed copper shaper (b), (d), and (f)

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Fig. 3

A scheme of a data-acquisition system

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Fig. 4

Dynamic compression stress–strain response of unheated pristine PU

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Fig. 5

Optical micrographs (10×) of unheated pristine PU tested at the strain rates of: (a) 1910 s−1, (b) 2851 s−1, (c) 3898 s−1, and (d) 4351 s−1

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Fig. 6

Dynamic compression stress–strain response of unheated GR/PU with 0.25% GR

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Fig. 7

Optical micrographs (10×) of unheated GR/PU with 0.25% GR tested at strain rates of: (a) 1630 s−1, (b) 2912 s−1, (c) 3400 s−1, and (d) 3815 s−1

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Fig. 8

Dynamic compression stress–strain response of unheated GR/PU with 0.5% GR

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Fig. 9

Dynamic compression stress–strain response of unheated GR/PU with 0.75% GR

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Fig. 10

Dynamic compression stress–strain response of unheated GR/PU with 1% GR

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Fig. 11

Dynamic compression stress–strain response of postheated pristine PU

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Fig. 12

Optical micrographs (10×) of postheated pristine PU tested at the strain rates of: (a) 1223 s−1, (b) 3018 s−1, (c) 3480 s−1, and (d) 4126 s−1

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Fig. 13

Dynamic compression stress–strain response of postheated GR/PU with 0.25% GR

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Fig. 14

Dynamic compression stress–strain response of postheated GR/PU with 0.5% GR

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Fig. 21

Damage modes of unheated and postheated GR/PU composites

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Fig. 20

Strain rate versus peak stress for postheated GR/PU composites at different GR contents

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Fig. 19

Strain rate versus peak stress of unheated GR/PU composites at different GR contents

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Fig. 16

Dynamic compression stress–strain response of postheated GR/PU with 1% GR

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Fig. 15

Dynamic compression stress–strain response of postheated GR/PU with 0.75% GR

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Fig. 18

Strain rate versus plateau stress in postheated GR/PU composites with different GR contents, measured at strain 0.01 m/m

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Fig. 17

Strain rate versus plateau stress in unheated GR/PU composites with different GR contents, measured at strain 0.01 m/m

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