Abstract
Deformation of metal foams under high rate of loading is a complex phenomenon due to the effects of various parameters involved therein. In the present investigation, cenosphere-filled aluminum alloy syntactic foam is studied under high rate of loading in comparison with their quasi-static behavior. The experiments, for high strain rates, are carried out using split Hopkinson pressure bar and full stress–strain curves of foam are developed under such rate of loadings. Foams with three different cenosphere sizes at three different high rates of loadings are investigated for their mechanical behavior. Compressive behavior and energy absorption capacity are reported considering the effect of high loading rates and cenosphere sizes. It is observed that, increase in loading rate results in higher strength of foams by an amount of 16-32%. Further, it is observed that energy absorption is improved with the increase in strain rates and cenosphere sizes and this improvement is observed in the range of 80-182%. Based on deformation modes and failure damage study, using SEM microstructure, deformation mechanism is observed to be almost independent of strain rate increment particularly at higher strain rates considered in this investigation. Moreover, there exists a limiting value of strain rate beyond which there is an insignificant increase in compressive strength of foams considered in the present investigation.
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Lead author acknowledges fellowship provided by INSA, India, and supported by IIT Kanpur for completing the reported investigation.
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Goel, M.D., Parameswaran, V. & Mondal, D.P. High Strain Rate Response of Cenosphere-Filled Aluminum Alloy Syntactic Foam. J. of Materi Eng and Perform 28, 4731–4739 (2019). https://doi.org/10.1007/s11665-019-04237-2
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DOI: https://doi.org/10.1007/s11665-019-04237-2