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本文利用增材制造技术制备了Bi-grid、Tri-grid、Quadri-grid和Kagome-grid 4种闭孔芯子结构,其与上、下面板胶粘在一起形成复合材料夹芯结构。利用有限元分析及三点弯曲测试,研究4种不同闭孔夹芯结构在弯曲载荷作用下的力学响应行为,并观察不同结构的破坏形式。结果表明:Bi-grid闭孔夹心结构的失效模式为芯子与面板的脱粘,而其他三种结构的临界破坏方式为芯子的剪切破坏。试样面板应力集中区域位于上面板的加载区域及下面板的支撑区域,芯子应力集中区域位于加载与支撑之间。Quadri-grid闭孔夹芯结构的力学性能优于其他三种结构。
In this paper, four kinds of closed-cell core structures of Bi-grid, Tri-grid, Quadri-grid and Kagome-grid were fabricated by additive manufacturing technology, which were glued together with the upper and lower panels to form a composite sandwich structure. Using finite element analysis and three-point bending test, the mechanical response of four kinds of closed-cell sandwich structures under bending load was studied and the failure modes of different structures were observed. The results show that the failure mode of Bi-grid closed-cell sandwich structure is the debonding of the core and the panel, while the critical failure mode of the other three structures is the shear failure of the core. The sample panel stress concentration area is located in the loading area of the upper panel and the supporting area of the lower panel, and the core stress concentration area is located between the loading and the supporting. The mechanical properties of the Quadri-grid closed-cell sandwich structure are superior to the other three structures.