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Bending behaviors of three grid sandwich structures with wood facing and jute fabrics/epoxy composites cores
Composite Structures ( IF 6.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.compstruct.2020.112666
Xue Wang , Xiao-long Shi , Qing-kai Meng , Ying-cheng Hu , Li-hai Wang

Abstract Three kinds of sandwich beams were prepared, which were cross, double cross and square sandwich structure (CSS, DCSS and SSS), using spruce wood as face panels, KH-560 modified jute fabrics reinforced epoxy laminated composites (JFRELC) as cores. This research investigated the mechanism of micro-surface modification of composites, the bending behaviors and failure modes of sandwich structures. The results showed that the grafting of KH-560 on jute fabric improved the interfacial compatibility and mechanical properties of laminated composite. The stretching vibration peak of C O Si/Si-O-Si groups of the KH-560 modified composites were found. The content of silicon in the modified composites was about 4 times of that in the unmodified composite. The flexural rigidity, shear rigidity, shear modulus and shear strength of SSS were 2.10 × 108 N·mm2, 1.97 × 105 N, and 143.94 MPa, 0.948 MPa respectively, which were significantly better than that of DCSS and CSS. The load-mass ratio of short beam of DCSS was similar to the long beam of SSS. The failure modes of three grid sandwich structures included shear failure, general shear failure, indentation, panel fracture and separation between the core and panel. The failure mechanism of the shear failure cores contained fiber pulling out and fiber splitting.

中文翻译:

具有木饰面和黄麻织物/环氧复合材料芯的三个网格夹层结构的弯曲行为

摘要 以云杉木为面板,以KH-560改性黄麻织物增强环氧层压复合材料(JFRELC)为芯材,制备了交叉、双交叉和方形夹层结构(CSS、DCSS和SSS)三种夹层梁。本研究研究了复合材料的微表面改性机制、夹层结构的弯曲行为和失效模式。结果表明,KH-560在黄麻织物上的接枝改善了层状复合材料的界面相容性和力学性能。发现了KH-560改性复合材料的CO Si/Si-O-Si基团的伸缩振动峰。改性复合材料中硅的含量约为未改性复合材料的4倍。SSS的抗弯刚度、剪切刚度、剪切模量和剪切强度均为2。分别为10×108 N·mm2、1.97×105 N、143.94 MPa、0.948 MPa,明显优于DCSS和CSS。DCSS短梁的荷重比与SSS长梁相似。三种网格夹层结构的破坏模式包括剪切破坏、一般剪切破坏、压痕、面板断裂和芯板分离。剪切破坏核心的破坏机制包括光纤拉出和光纤分裂。
更新日期:2020-11-01
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