Bouligand结构最佳俯仰角的确定

Wenting Ouyang, B. Gong, Huan Wang, F. Scarpa, Yuexin Peng, H. Peng
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引用次数: 0

摘要

Bouligand结构是一种典型的螺旋结构,存在于各种甲壳类动物中,其中每一层相对于相邻的一层旋转一个小角度。我们提出了一个理论分析,将旋转俯角与模拟Bouligand结构的层压板的力学性能(在这种情况下的层间剪切性能)联系起来。将螺旋面复合材料层叠顺序的理论模型与32层螺旋面碳纤维层叠板的实验结果进行了比较,其中俯仰角为6°、9.1°、12°和25.7°,其中预测的最佳角度为9.1°。结果表明,这种俯仰角为9.1°的特殊结构确实具有最高的承载能力,并且可以延迟任何灾难性的分层。我们还研究了旋转角度对裂纹扭曲和分支等机制所起的作用,这些机制负责优越的性能。这些结果为模拟布利甘建筑的螺旋结构的设计提供了基础依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Identifying the Optimal Pitch Angles for Bouligand Structures
The Bouligand structure is a typical helicoidal architecture found in various crustaceans in which each layer rotates by a small angle relative to the adjacent one. We present a theoretical analysis to relate the rotation pitch angle to the mechanical performance (interlaminar shear property in this case) of laminas mimicking the Bouligand architecture. Theoretical models representing the helicoidal composite laminate stacking sequences are compared against experimental tests carried out on 32-layer helicoidal carbon fibre laminates with pitch angles of 6°, 9.1°, 12°, 25.7° where the 9.1° is the predicted optimal angle. The results show that this particular architecture with a pitch angle of 9.1° indeed attains the highest load-bearing capability and delays any catastrophic delamination. We also examine the role played by the rotation angle on the mechanisms like crack twisting and branching that are responsible for the superior performance. These results provide a fundamental basis to the design of helicoidal structures mimicking the Bouligand architecture.
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