Abstract
This paper presents a primarily experimental investigation of the instability behaviour of polymer foam cored sandwich structures loaded at elevated temperatures. An experimental setup was designed to induce the unstable behaviour using sandwich beam specimens subjected to four-point bending and by imposing a linear temperature gradient through the core thickness. A wavy deformation of the face-sheet was observed using high-speed imaging combined with digital image correlation (DIC) for the specimens tested at elevated temperatures over 70 °C, thus identifying the occurrence of face-sheet wrinkling. The face-sheet wavy deformation evolves to core crushing in tens of microseconds and thereby the high-speed imaging is essential in this work. The experimental results shows that the failure mode of the specific polymer foam cored sandwich beam specimens shifts from face-sheet yielding to face-sheet wrinkling as the temperature increases, and this is shown to agree well with analytical and numerical predictions.
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Acknowledgments
The work presented was co-sponsored by the Chinese Scholarship Council, the Danish Council for Independent Research | Technology and Production Sciences (FTP), Grant Agreement 274-08-0488, “Thermal Degradation of Polymer Foam Cored Sandwich Structures”, and the US Navy, Office of Naval Research (ONR), Grant Award N000140710227. The ONR programme manager was Dr. Yapa D. S. Rajapakse. The financial support received is gratefully acknowledged.
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Zhang, S., Dulieu-Barton, J.M., Thomsen, O.T. (2014). Experimental Characterization of Thermomechanically Induced Instability in Polymer Foam Cored Sandwich Structures. In: Tandon, G., Tekalur, S., Ralph, C., Sottos, N., Blaiszik, B. (eds) Experimental Mechanics of Composite, Hybrid, and Multifunctional Materials, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00873-8_13
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DOI: https://doi.org/10.1007/978-3-319-00873-8_13
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