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Identifying optimal rotating pitch angles in composites with Bouligand structure
Composites Communications ( IF 8 ) Pub Date : 2020-12-26 , DOI: 10.1016/j.coco.2020.100602
Wenting Ouyang , Bowen Gong , Huan Wang , Fabrizio Scarpa , Bo Su , Hua-Xin Peng

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. For a given laminate, there exists an optimal pitch angle which yields the lowest shear stress. Theoretical models 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. This provides a fundamental basis to the design of helicoidal structures mimicking the Bouligand architecture.



中文翻译:

确定具有Bouligand结构的复合材料的最佳旋转俯仰角

Bouligand结构是在各种甲壳类动物中发现的典型螺旋结构,其中每一层相对于相邻的一层旋转一个小角度。我们提出了一种理论分析,以将旋转俯仰角与模仿Bouligand结构的薄层的机械性能(在这种情况下为层间剪切特性)相关联。对于给定的层压板,存在产生最小剪切应力的最佳俯仰角。将理论模型与在32层螺旋碳纤维层压板上进行的实验测试进行了比较,螺距角为6°,9.1°,12°,25.7°,其中9.1°是预测的最佳角度。结果表明,这种具有9.1°俯仰角的特殊结构的确能实现最高的承载能力,并延迟了任何灾难性的分层。

更新日期:2020-12-26
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