Applying carbon fiber composite honeycomb in curved sandwich shells faces challenges due to the saddle-shaped bending surface in hexagon configurations and potential damage during the shape-forming process. This study analyzes the bending deformation of honeycombs by developing large deformation theoretical model for their bending surfaces. The study introduces two novel honeycomb configurations—Boomerang-shaped with a positive Poisson's ratio and Jellyfish-shaped with a negative Poisson's ratio—achieved through curved-wall design and fabrication using a modified carbon fiber composite tape winding molding process. Experimental tests, including bending deformation and shape-forming tests, measure the three-dimensional bending surfaces and mechanical responses of carbon fiber composite honeycombs. Additionally, a developed finite element model analyzes the damage states of various carbon fiber composite honeycombs during shape-forming processes. The results reveal the bending deformation of carbon fiber composite honeycombs and present damage state cloud maps to facilitate the optimal matching of objective sandwich shells with minimal scathe.

中文翻译：

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碳纤维复合蜂窝的表面匹配设计


由于六边形配置的马鞍形弯曲表面和形状成型过程中的潜在损坏，在弯曲的夹层壳中应用碳纤维复合蜂窝面临挑战。本研究通过开发蜂窝弯曲面的大变形理论模型来分析蜂窝的弯曲变形。该研究介绍了两种新颖的蜂窝配置——具有正泊松比的回旋镖形和具有负泊松比的水母形——通过使用改性碳纤维复合带缠绕成型工艺的曲面壁设计和制造实现。实验测试，包括弯曲变形和形状成型测试，测量碳纤维复合蜂窝的三维弯曲表面和机械响应。此外，开发的有限元模型分析了各种碳纤维复合材料蜂窝在形状成型过程中的损伤状态。结果揭示了碳纤维复合材料蜂窝的弯曲变形，并呈现了损伤状态云图，以促进目标夹层壳的最佳匹配和最小的疤痕。