玻璃纤维立体织物增强环氧树脂泡沫夹层复合材料的制备及力学性能

为了进一步提高泡沫夹层复合材料的承载能力和综合性能，实现其在轨道交通及汽车等工业领域的应用，开展了玻璃纤维立体织物增强环氧树脂泡沫(GF-Fabric/EP)复合材料的制备及其力学性能的研究。制备GF-Fabric/EP复合材料及其夹层结构，探索了GF-Fabric/EP复合材料及其夹层结构的失效行为，以揭示立体织物的增强机制。结果表明：立体织物的引入可显著改善GF-Fabric/EP复合材料的强度、刚度及破坏应变；但在不同承载条件下，各纱线发挥承载作用和效果不同。面板、芯材各自的性能、尺寸及面/芯界面性能均是影响GF-Fabric/EP夹层复合材料力学性能及失效特征的重要因素。以三点加载下的弯曲性能为例，针对不同的GF-Fabric/EP夹层复合材料，需调整跨厚比和试样尺寸并获得理想的失效特征，方可对其弯曲性能或层间剪切性能进行有效、合理的评价。

Preparation and mechanical properties of glass fiber reinforced 3D fabric reinforced epoxy foam sandwich composites

The preparation and mechanical properties of glass fiber 3D fabric reinforced epoxy foam composites (GF-Fabric/EP composites) were studied in order to further improve the bearing capacity and comprehensive properties of foam sandwich composite materials and realize its application in rail transit and automobile industry. The GF-Fabric/EP composite and its sandwich structure were fabricated. The failure behavior of GF-Fabric/EP composite and its sandwich structure were explored to reveal the reinforcing mechanism of the 3D fabric. The results show that the introduction of 3D fabric can significantly improve the strength, stiffness and failure strain of GF Fabric/EP composites. However, under different load-bearing conditions, each yarn plays a different role and effect. The properties, dimensions and surface/core interface properties of panel and core materials are important factors affecting the mechanical properties and failure characteristics of GF Fabric/EP sandwich composites. Taking the bending properties under three-point loading as an example, for different GF Fabric/EP sandwich composites, it is necessary to adjust the span thickness ratio and specimen size and obtain ideal failure characteristics before effective and reasonable evaluation of their bending properties or interlaminar shear properties.