In this study, the impact response and damage mechanisms of carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) hybrid face sheet sandwich composites are investigated with the aim to provide an understanding and solution to mitigate the coupling effects of low temperature and low velocity impact damage. Hybridization of face sheet is achieved by stacking CFRP and GFRP in different thickness configurations. Samples are subjected to low-velocity impact at 23 °C and −70 °C to compare and understand the effect of cold temperature in the Arctic environment. Results show that hybridization improves the impact performance at −70 °C. CFRP layers and foam core become extremely brittle at low temperature, but GFRP layers maintain a certain extent of ductility and enhanced laminate strength at low temperature. Moreover, different damage modes (delamination, fiber breakage, core crushing, core shear, face sheet debonding, back face fiber splitting) are observed and characterized by X-ray micro-computed tomography. The additions of GFRP layers to CFRP face sheet mitigated the increased brittle fiber failure observed at low temperatures, however the impact characteristics and damage size was found to be dependent on the hybridization configuration.

中文翻译：

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夹层复合材料中面板的杂化可减轻低温和低速冲击损伤

在本研究中，研究了碳纤维增强聚合物（CFRP）和玻璃纤维增​​强聚合物（GFRP）混合面板夹层复合材料的冲击响应和损伤机制，旨在为减轻低温耦合效应提供理解和解决方案。和低速冲击损伤。面板的混合是通过堆叠不同厚度配置的 CFRP 和 GFRP 来实现的。样品在 23 °C 和 -70 °C 下受到低速冲击，以比较和了解北极环境中低温的影响。结果表明，杂交提高了 -70 °C 下的冲击性能。 CFRP层和泡沫芯材在低温下变得极脆，但GFRP层在低温下保持一定程度的延展性并增强层压板强度。此外，通过X射线微计算机断层扫描观察并表征不同的损伤模式（分层、纤维断裂、芯破碎、芯剪切、面板脱粘、背面纤维分裂）。在 CFRP 面板上添加 GFRP 层可以减轻在低温下观察到的脆性纤维失效增加的情况，但发现冲击特性和损伤大小取决于混合配置。