Abstract
The mechanical characteristics of vinyl ester nanocomposites were investigated under a high rate of axial loading. The thermoset composites were sonicated with exfoliated graphite nanoplatelet (xGnP) and added with carboxyl-terminated butadiene nitrile (CTBN). High-strain rate axial tests were accomplished employing a split-Hopkinson pressure bar (SHPB) test-setup following a direct and a reverse impact method. Finite element analysis (FEA) and parametric optimization of the specimen geometry were performed using ANSYS Mechanical APDL®. Observing multi-surface fractures validated uniformity of stress distribution within the specimen gauge length. A laser occlusion expansion gauge (LOEG) technique was considered for measuring axial strain. The loading pulse within the transmitted bar was significantly low. Hence, an alternative approach (considering the pulse within the incident bar only) was applied for obtaining the stress–time history. A conventional SHPB setup provided a high rate of compressive deformation response. Both flow strength and energy absorbability of the participating material systems showed significantly lower under tension than under compression at a high rate. Nano-reinforcement marginally enhanced these mechanical characteristics for pristine vinyl ester under a high rate of tension. The material system responded detrimental under a high rate of compression.
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Acknowledgements
The Office of Naval Research, Solid Mechanics Program (Dr. Y. D. S. Rajapakse, Program Manager) Grant No. N00014-7-1-1010; and US Army Research Office under the DOD-PIRT sub-contracted through North Carolina A & T University Grant No. 300223243A funded this research.
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Pramanik, B., Mantena, P.R., Rajendran, A.M. (2020). Axial Deformation Characteristics of Graphene-Sonicated Vinyl Ester Nanocomposites Subjected to High Rate of Loading. In: Singh, B., Roy, A., Maiti, D. (eds) Recent Advances in Theoretical, Applied, Computational and Experimental Mechanics. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-1189-9_26
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