Honeycomb-cored sandwich panels increase part stiffness at a lower weight than monolithic composite materials. This article illustrates an area of a honeycomb-cored sandwich structure composite cross section that is viewed using transmitted polarized light. This area shows the differences in the constituents and resin intermingling. The article discusses the factors that govern the honeycomb core movement and honeycomb core crush, with illustrations. Some common tests performed on honeycomb composites to characterize the skin-to-core bond strength are the climbing drum peel and flatwise tensile tests. The article concludes with a description on the reasons for core failure, which are analyzed...
Brian S. Hayes, Luther M. Gammon, Analysis of Honeycomb-Cored Sandwich Structure Composites, Metallography and Microstructures, Vol 9, ASM Handbook, Edited By George F. Vander Voort, ASM International, 2004, https://doi.org/10.31399/asm.hb.v09.a0009083
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