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Research Papers

Dynamic Attenuation and Compressive Characterization of Syntactic Foams

[+] Author and Article Information
Bhaskar Ale

e-mail: bhaskarale@hotmail.com

Carl-Ernst Rousseau

Associate Professor
Mem. ASME
e-mail: rousseau@uri.edu
Department of Mechanical Engineering,
University of Rhode Island,
Kingston, RI 02881

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received July 18, 2012; final manuscript received February 7, 2013; published online May 6, 2013. Assoc. Editor: Hanchen Huang.

J. Eng. Mater. Technol 135(3), 031007 (May 06, 2013) (6 pages) Paper No: MATS-12-1171; doi: 10.1115/1.4023850 History: Received July 18, 2012; Revised February 07, 2013

Hollow particulate composites are lightweight, have high compressive strength, are low moisture absorbent, have high damping materials, and are used extensively in aerospace, marine applications, and in the manufacture of sandwich composites core elements. The high performance of these materials is achieved by adding high strength hollow glass particulates (microballoons) to an epoxy matrix, forming epoxy-syntactic foams. The present study focuses on the effect of volume fraction and microballoon size on the ultrasonic and dynamic properties of Epoxy Syntactic Foams. Ultrasonic attenuation coefficient from an experiment is compared with a previously developed theoretical model for low volume fractions that takes into account attenuation loss due to scattering and absorption. The guidelines of ASTM Standard E 664-93 are used to compute the apparent attenuation. Quasi-static compressive tests were also conducted to fully characterize the material. Both quasi-static and dynamic properties, as well as coefficients of attenuation and ultrasonic velocities are found to be strongly dependent upon the volume fraction and size of the microballoons.

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Figures

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Fig. 1

Measured density of syntactic foams with varying volume fraction

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Fig. 2

(a) Ultrasonic pulse-echo immersion testing system (left), and (b) shear wave contact transducer (right)

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Fig. 3

Typical syntactic foam ultrasonic pulse-echo response

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Fig. 4

Longitudinal wave speed of syntactic foams with increasing volume fractions

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Fig. 5

Shear wave speed of syntactic foams with increasing volume fractions

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Fig. 6

Comparison of experimental and theoretical [1] attenuation

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Fig. 7

Typical stress-strain plot of syntactic foams with different volume fractions

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Fig. 8

Cracks formation on K1-40 (left) and K1-10 (right) type syntactic foams

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Fig. 9

(a) Compressive modulus (left), and (b) yield strength of syntactic foams (right)

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