The use of hybrid reinforcement in polymer composites has been getting attention due to its potential for weight and cost reduction while achieving improved design flexibility for mechanical and thermal properties. In this study, an interply hybridization of epoxy laminates was performed using layers of solid and hollow glass fibers. The structural and thermal performance of the resulting hybrid vascular composites was investigated. All composite parts were manufactured using vacuum‐assisted resin transfer molding (VARTM), following an interply hybridization plan for the stacking sequence of hollow and solid fiber layers. An expected decrease in flexural properties and thermal conductivity was observed for the laminates with completely hollow fibers. On the other hand, hybridization had a positive effect on the laminate properties. It was shown that hybrid vascular composites could be manufactured without a significant reduction in mechanical and thermal performance by a judicious hybridization plan. The optimum hybridization of the laminate achieved a 3.1% increase in the specific flexural strength and a 5.3% decrease in thermal conductivity while containing a vascular network that can be used for active thermal control.Highlights A vascular interply composite structure consisting of hollow and solid fibers was manufactured and characterized for the first time. The I4 composite, vascularized through the middle layers of the laminate, has almost as much flexural strength as solid composite and much more specific flexural strength. The thermal conductivity of the I4 composite is almost as much as that of the solid composite. Functional composites for thermal management and smart applications can be manufactured using hollow fibers without sacrificing flexural strength and thermal conductivity with interply vascularization.

中文翻译：

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空心玻璃纤维增​​强血管复合材料的层间杂化

混合增强材料在聚合物复合材料中的使用因其在减轻重量和降低成本的同时提高机械和热性能的设计灵活性而受到关注。在这项研究中，使用实心和空心玻璃纤维层进行环氧层压板的层间杂化。研究了所得混合血管复合材料的结构和热性能。所有复合材料部件均采用真空辅助树脂传递模塑 (VARTM) 制造，遵循空心纤维层和实心纤维层堆叠顺序的层间杂交计划。对于具有完全中空纤维的层压材料，观察到弯曲性能和导热率预期下降。另一方面，杂交对层压材料的性能有积极的影响。结果表明，通过明智的杂交计划，可以在不显着降低机械和热性能的情况下制造混合血管复合材料。层压板的最佳混合实现了比弯曲强度提高 3.1%，导热系数降低 5.3%，同时包含可用于主动热控制的血管网络。亮点 首次制造并表征了由空心纤维和实心纤维组成的血管层间复合结构。 I4 复合材料通过层压板的中间层进行血管化，其弯曲强度几乎与固体复合材料相同，并且比弯曲强度高得多。 I4复合材料的导热系数几乎与固体复合材料的导热系数相同。 用于热管理和智能应用的功能复合材料可以使用中空纤维制造，而不会因层间血管化而牺牲弯曲强度和导热性。