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首页> 外文期刊>Composite Structures >Mode Ⅱ interlaminar fracture toughness of carbon nanotubes/epoxy film- interleaved carbon fiber composites
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Mode Ⅱ interlaminar fracture toughness of carbon nanotubes/epoxy film- interleaved carbon fiber composites

机译：碳纳米管/环氧薄膜交错碳纤维复合材料的模式ⅡⅡ型骨折韧性

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摘要

In recent years, the demand for composite materials in various industries such as aerospace, defense, and automotive industries has increased significantly. Furthermore, the mechanical properties of carbon fiber-reinforced plastic (CFRP) composites have been improved significantly. However, the out-of-plane (thickness direction) mechanical properties of CFRP laminates are considerably inferior to their in-plane mechanical properties. Owing to their unique properties, carbon nanotubes (CNTs) have been used to improve the mechanical properties of CFRP composites. However, it is challenging to disperse high concentrations of CNTs in the polymer resin matrices of such composites. In this study, a high concentration of CNTs was incorporated in CFRP laminates in the form of CNT/epoxy films by using ultrasonication and three-roll milling. Furthermore, unidirectional and plain woven prepregs were used for reinforcement. The mode II interlaminar fracture toughnesses of the CNT/epoxy film-interleaved CFRP composites with different CNT concentrations were measured by carrying out their end-notched flexure (ENF) tests. Optical micrographs were obtained to observe the microstructures of the specimens with different CNT loadings. The fracture surfaces obtained after the ENF tests were examined using a scanning electron microscope to investigate the toughening mechanism of the composites.
机译：近年来，航空航天，防御和汽车行业等各个行业的复合材料的需求显着增加。此外，碳纤维增强塑料（CFRP）复合材料的机械性能显着提高。然而，CFRP层压板的平面外（厚度方向）机械性能显着差不等于其面内机械性能。由于其独特的性质，已用于改善CFRP复合材料的机械性能的碳纳米管（CNT）。然而，在这种复合材料的聚合物树脂基质中分散高浓度的CNT挑战。在该研究中，通过使用超声波和三辊研磨，以CNT /环氧膜的形式在CFRP层压板中掺入高浓度的CNT。此外，单向和普通编织预浸料坯用于增强。通过进行其端缺陷的弯曲（ENF）试验，测量具有不同CNT浓度的CNT /环氧膜交错CFRP复合材料的模式II层间断裂韧性。获得光学显微照片以观察具有不同CNT载荷的样本的微观结构。使用扫描电子显微镜检查enf测试后获得的裂缝表面，以研究复合材料的增韧机构。

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