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A study was conducted to evaluate the reliability of a sandwich column specimen for uniaxial compressive tests. Both stress-strain and failure behavior were observed, and comparisons were made with predictions from existing techniques. The properties of the aluminum honeycomb core were also measured and included in the analysis to show its limited effects on the overall behavior of the specimen. Control tests were performed on specimens with aluminum facesheets to further quantify the effect of the honeycomb core on the overall behavior of the structure. The main battery of tests was conducted with graphite/epoxy facesheets of [θ12], [±θ/o]s, and [0/±θ]s configurations. The general excellent correlations between the observed moduli and Poisson's ratios and predicted values indicate that the specimen provides true stress-strain behavior. Moreover, consistent failure modes within the test section including both in-plane failure and ply buckling or delamination failure followed by in-plane failure indicate that the specimen is valid for failure behavior data.
compression, composites, test methods, sandwich column, graphite/epoxy, mechanical properties, failure
Associate professor, Technology Laboratory for Advanced Composites, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA
assistant professor, University of Maryland, College Park, MD