Dynamic mechanical properties of closed-cell aluminum foams with uniform and graded densities
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Dynamic mechanical properties of closed-cell aluminum foams with uniform and graded densities Ying Zhao1, Chenyang Ma1, Dabo Xin1,a), Ming Sun2 1
School of Civil Engineering, Northeast Forestry University, Harbin 150040, PR China School of Civil Engineering, Harbin Institute of Technology, Harbin 150040, PR China a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 26 November 2019; accepted: 1 June 2020
In this study, the quasi-static and dynamic mechanical behaviors and the energy absorption capacity of closedcell aluminum foams with uniform and graded densities were experimentally studied. The effects of density, strain rate, and graded density on the mechanical performances of aluminum foams were quantitatively evaluated. It was shown that the density had a significant effect on the quasi-static and dynamic compressive stress of aluminum foams. Moreover, impact compression experiment results revealed that aluminum foam was sensitive to the strain rate. As the strain rate increased, the plateau stress and energy absorption capacity increased distinctly and the rate of deformation increased correspondingly. Finally, the investigation of aluminum foams with uniform and graded densities to study their deformation and failure mechanisms, mechanical characteristics, and energy absorption capacities showed that the GD 0.48-IV specimen exhibited superior impact resistance. The present work can provide a valuable reference for the optimum design of aluminum foam against impact loading.
Introduction Closed-cell aluminum foam is a kind of cellular metallic material that has extensive applications [1, 2]. Owing to its recyclability, high strength–weight ratio, and excellent energy absorption and damping properties [3, 4, 5], closed-cell aluminum foam exhibits widespread applications in aerospace, automobile, and civil engineering structural applications; one of the potential uses of closed-cell aluminum foam is in the core of composite sandwich panels [6, 7, 8]. Closed-cell aluminum foam has good performance and high application potential in absorbing energy, and there is great research significance to further explore its mechanical properties, energy-absorbing capacity, and deformation mechanisms. Many researchers have investigated the mechanical properties of closed-cell aluminum foams under static and dynamic loads at home and abroad in the past years, and many valuable experimental results and conclusions had been obtained. However, there are controversial views in academic circles concerning whether closed-cell aluminum foam has a strain rate effect. Some scholars believe that the dynamic response of closed-cell aluminum foam is clearly dependent upon the strain rate effect [9, 10, 11, 12]. Dannemann and Lankford
© Materials Research Society 2020
[13] conducted experimental research on the dynamic compressive behavior of closed-cell aluminum foam in a range of strain rates (400–2500 s−1) by using a Split-Hopkinson pressure bar (SHPB) experimental device. The test demonstrated that
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