The effect of out-of-plane stitching and the addition of multiwalled carbon nanotubes on the short-beam shear properties of carbon/epoxy composites were investigated. Stitching influenced the short-beam strength of carbon satin and twill fabric composites, where the stitched satin carbon/epoxy composites showed improved short-beam properties compared with the unstitched satin carbon/epoxy composites. In general, stitching and MWCNTs addition enhanced the short-beam strength of the composite. The fracture of the composites generally exhibited as a combination of lateral total matrix cracking, warp fiber breakage and interlayer opening. In addition, all the structures experienced angularly sheared catastrophic through-the-thickness layer breakage. It was also shown that delamination was largely restricted in stitched and nano-added composites when compared to the unstitched samples. It can be concluded that nanostitching could be considered for improving short-beam strength properties of the composite.

中文翻译：

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纳米预浸料/纳米缝合三维碳/环氧多壁碳纳米管复合材料的短束剪切

研究了平面外缝合和添加多壁碳纳米管对碳/环氧树脂复合材料的短束剪切性能的影响。缝合影响碳缎和斜纹织物复合材料的短梁强度，其中缝合缎碳/环氧树脂复合材料与未缝合的缎碳/环氧树脂复合材料相比显示出改进的短梁性能。一般来说，缝合和 MWCNTs 的添加增强了复合材料的短梁强度。复合材料的断裂通常表现为横向总基体开裂、经向纤维断裂和层间开裂的组合。此外，所有结构都经历了角度剪切的灾难性贯穿厚度层断裂。还表明，与未缝合的样品相比，缝合和纳米添加复合材料的分层在很大程度上受到限制。可以得出结论，可以考虑纳米缝合来提高复合材料的短梁强度性能。