Journal
THIN-WALLED STRUCTURES
Volume 170, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2021.108591
Keywords
Honeycomb-corrugation hybrid core; Sandwich structures; Three-point bending; Failure mode; Minimum mass
Categories
Funding
- National Natural Science Founda-tion of China [12072250, 12102327, 12102328]
- China Postdoc-toral Science Foundation [2020TQ0238]
- Fundamental Research Funds for the Central Universities, China [xpt012021028]
- Aviation Science Foundation Project, China [20170970002]
- Open Project for Key Laboratory of Intense Dynamic Loading and Effect, China [KLI-DLE1801]
- Open Fund of the State Key Laboratory of Mechanics and Control of Mechanical Structures, China (Nanjing University of Aeronautics and astronautics) [MCMS-E0219K02]
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This study investigates the bending stiffness, failure load, failure modes, and minimum mass design of square honeycomb-corrugation hybrid core sandwich structures under bending. Results show that honeycomb fillers not only change the failure mode but also enhance bending resistance significantly. The study successfully achieves minimum weight design and quantifies the effects of key factors, while comparing mechanical performances with other competing structures.
In this work, the bending stiffness, initial failure load, initial failure modes and minimum mass design of square honeycomb-corrugation hybrid core sandwich structures (SHCH) subjected to bending were explored by a combined theoretical analysis, experimental testing, and numerical prediction method. Samples were fabricated by brazing process and measured under three-point bending. To theoretically obtain the initial failure mechanism map, six different initial failure modes were taken into account, which agree well with associated experimental data and numerical results. It is found that honeycomb filler not only changed the failure mode of corrugated core sandwiches but also enhanced dramatically its bending resistance. Then the minimum weight design is achieved as a function of load index, and the effect of key factors, including honeycomb relative density, loading platen width, material parameters, and inclination angle are quantified. Furthermore, the mechanical performances of SHCHs are compared with the competing structures.
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