Abstract
Sandwich structures with optimized foam core have received considerable attention. The objective of this study is to investigate the indentation of sandwich beams with a two-layer core gradation. An analytical model is developed to predict the large indentation deflections of sandwich beams with two-layer metal foam cores subjected to the concentrated loading. Analytical predictions are compared with finite element simulations and good agreement is obtained. The effects of face sheet strength, core strength, and thickness ratio on the initial failure load of sandwich beams with core gradation are discussed in detail. The results show that through variation of the core thickness ratio and core strength ratio, the failure mode of sandwich beams could be controlled. Meanwhile, the load-carrying and energy absorption capacity of the sandwich beams can also be improved. This work is useful in the core design of the sandwich structures.
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