Abstract
This work aims to analyze the dynamic response of asymmetry sandwich structure to low-velocity impact and study the influence of different panel thickness on sandwich structure impact performance. The failure mechanism is analyzed by combining experiment, theoretical analysis and simulation. The finite element model (FE model) was constructed in the software ABAQUS, and established a theoretical model to predicting the damage mode. Moreover, the optimal design of the asymmetric sandwich structure is studied by analyzed the EA and SEA of the structure. Pendulum impact test was carried out, the FE model was verified by experiment, and the theoretical model was verified by experiment and simulation. The results show that the front panel mainly affects the energy absorption capacity, and the back panel mainly affects the failure load. When both the front panel and the back panel are less than 1 mm, the structure shows panel fracture failure mode. When the front panel is less than 1 mm while the back panel is greater than 1 mm, intention failure mode occurs. When the front panel is greater than 1 mm, all failure modes of the structure are core shear failure. After research, when the thickness of the front panel is 2 mm and the thickness of the back panel is 3 mm, the EA and SEA are higher, and the structure is more economical.
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