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Equivalent models and mechanical properties of bio-inspired corrugated sandwich structures subjected to bending loads

机译：对弯曲载荷进行生物启发瓦楞三明治结构的等效模型和机械性能

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摘要

Corrugated sandwich structures have been widely used in aerospace and aviation fields due to their excellent performances. In this paper, a new bio-inspired corrugated sandwich structure is designed based on the microstructure of cybister elytra. Moreover, the homogenization method is used to simplify models and the equivalent material parameters are derived by analytical formulation and finite element method (FEM). The mechanical properties of bio-inspired corrugated sandwich structures fabricated by selective laser melting (SLM) and equivalent models are also investigated subjected to bending loads by FEM and experiments. The results show that the bio-inspired corrugated sandwich structure can be equivalent to the orthotropic model better. Increasing the core height, thickness of the core and panel will improve the bending stiffness obviously. The simulation results are consistent with analytical formulation. But the experimental results are little greater due to the dimension deviation between the fabrication and design. Moreover, the equivalent calculation has a much higher accuracy with a relative deviation less than 10%.
机译：由于其性能优异，瓦楞三明治结构已广泛应用于航空航天和航空领域。本文基于Cybister Elytra的微观结构设计了一种新的生物启发瓦楞三明治结构。此外，使用均质化方法来简化模型，并且通过分析制剂和有限元方法（FEM）来源的等效材料参数。通过FEM和实验对通过选择性激光熔化（SLM）和等效模型制造的生物启发瓦楞砂质结构的机械性能和等效模型进行了调查。通过FEM和实验进行弯曲载荷。结果表明，生物启发的瓦楞三明治结构可以更好地等同于正交模型。增加芯高，芯和面板的厚度明显改善弯曲刚度。仿真结果与分析制剂一致。但由于制造与设计之间的尺寸偏差，实验结果几乎更大。此外，等效计算具有更高的精度，相对偏差小于10％。

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