Public Release: 

Syntactic foam sandwich fills hunger for lightweight yet strong materials

NYU School of Engineering's Nikhil Gupta and collaborators discover a way to expand the applications of metal matrix syntactic foams to autos, ships, trains, and more

NYU Tandon School of Engineering

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IMAGE: A team of researchers has developed the first composite material that sandwiches a layer of lightweight metal matrix syntactic foam between two carbon fabric layers, offering extreme light weight, flexibility,... view more

Credit: NYU Polytechnic School of Engineering

A team of researchers reports success in pioneering tests of a layered material with a lightweight metal matrix syntactic foam core that holds significant potential for automobiles, trains, ships, and other applications requiring lightweight structural components that retain their strength even when bent or compressed.

The research team of Nikhil Gupta, a NYU School of Engineering associate professor in the Department of Mechanical and Aerospace Engineering, working with the Toledo, Ohio, company Deep Springs Technology and the U.S. Army Research Laboratory, published their findings in Materials Science and Engineering: A.

Conventional metal foams have gas-filled pores within the metal, which reduce weight but pose some drawbacks, such as difficulty in controlling the size and shape of the pores during manufacturing.

By contrast, metal matrix syntactic foams incorporate porosity in their foam-like structure by means of hollow particles. In recent years there has been an upsurge in the use of these materials, mainly because of their compressive strength. However, bending strength was a limitation for many potential applications, notably automotive structures.

Metallic foams previously have been sandwiched between two stiff sheets, which provide increased flexural strength while the foam core allows the material to withstand large deformation and absorb energy. But Gupta and his colleagues are the first to develop a metal matrix syntactic foam core sandwich composite.

Their study focused on an aluminum alloy filled with hollow alumina particles sandwiched with carbon fabric face-sheets. The researchers discovered that the resulting layered material reduced weight but also increased stiffness and offered high energy absorption. These qualities make the metal matrix syntactic foam sandwich attractive for automotive floor board panels and other applications in which bending properties are important.

"This work could result in a new generation of ships and ground vehicles for both the military and civilian sectors," says Gupta. "Trains can also benefit from the lightweight and high energy absorbing panels made possible by the new sandwich composite."

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The paper "Syntactic Foam Core Metal Matrix Sandwich Composite: Compressive Properties and Strain Rate Effects" reporting these findings is available at http://www.sciencedirect.com/science/article/pii/S0921509315301854.

The NYU Polytechnic School of Engineering dates to 1854, when the NYU School of Civil Engineering and Architecture as well as the Brooklyn Collegiate and Polytechnic Institute (widely known as Brooklyn Poly) were founded. Their successor institutions merged in January 2014 to create a comprehensive school of education and research in engineering and applied sciences, rooted in a tradition of invention, innovation and entrepreneurship. In addition to programs at its main campus in downtown Brooklyn, it is closely connected to engineering programs in NYU Abu Dhabi and NYU Shanghai, and it operates business incubators in downtown Manhattan and Brooklyn. For more information, visit http://engineering.nyu.edu.

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