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Fabrication and Mechanical Testing of Ultralight Folded Lattice-Core Sandwich Cylinders
Engineering ( IF 12.8 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.eng.2019.11.008
Wanxin Li , Qing Zheng , Hualin Fan , Bin Ji

Abstract In this research, two novel folded lattice-core sandwich cylinders were designed, manufactured, and tested. The lattice core has periodic zigzag corrugations, whose ridges and valleys are directed axially or circumferentially. Free vibration and axial compression experiments were performed to reveal the fundamental frequency, free vibration modes, bearing capacity, and failure mode of the cylinder. A folded lattice core effectively restricts local buckling by reducing the dimension of the local skin periodic cell, and improves the global buckling resistance by enhancing the shear stiffness of the sandwich core. The cylinders fail at the mode of material failure and possess excellent load-carrying capacity. An axially directed folded sandwich cylinder has greater load-carrying capacity, while a circumferentially directed folded sandwich cylinder has higher fundamental frequencies. These two types of folded lattices provide a selection for engineers when designing a sandwich cylinder requiring strength or vibration. This research also presents a feasible way to fabricate a large-dimensional folded structure and promote its engineering application.

中文翻译:

超轻折叠格芯夹芯圆柱的制作与力学测试

摘要 本研究设计、制造并测试了两种新型折叠格芯夹层圆柱体。晶格核心具有周期性的之字形波纹,其脊和谷沿轴向或周向定向。进行自由振动和轴向压缩实验以揭示气缸的基频、自由振动模式、承载能力和失效模式。折叠晶格芯通过减小局部蒙皮周期单元的尺寸有效地限制局部屈曲,并通过增强夹心芯的剪切刚度来提高整体抗屈曲能力。气缸在材料失效模式下失效,具有优良的承载能力。轴向折叠的夹层圆柱体具有更大的承载能力,而圆周方向折叠的夹层圆柱体具有更高的基频。这两种折叠格子为工程师在设计需要强度或振动的夹层圆柱体时提供了选择。该研究还为制造大尺寸折叠结构并促进其工程应用提供了一种可行的方法。
更新日期:2020-02-01
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