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首页> 美国卫生研究院文献>Nanomaterials >Mode II Interfacial Fracture Toughness of Multi-Walled Carbon Nanotubes Reinforced Nanocomposite Film on Aluminum Substrate
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Mode II Interfacial Fracture Toughness of Multi-Walled Carbon Nanotubes Reinforced Nanocomposite Film on Aluminum Substrate

机译：铝基板上多壁碳纳米管增强纳米复合膜的II型界面断裂韧性

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摘要

In this investigation, various loadings of multi-walled carbon nanotubes (MWCNTs) ranging from 0.3–1.0 wt % were incorporated into the epoxy to fabricate the nanocomposites. Nanocomposite film with a thickness of 0.2 mm was deposited on an aluminum substrate through a hot-pressing process. Theoretical expression of the model II strain energy release rate for the film/substrate composite structure was derived. End-notched flexure (ENF) tests were performed to characterize the mode II fracture energy of the composite structure. Experimental results indicate that the elastic modulus, ultimate strength, and mode II fracture energy increase as the MWCNT loading in the nanocomposite increases. In the case of nanocomposite film with 1.0 wt % of MWCNTs, the elastic modulus, ultimate strength, and mode II interfacial fracture toughness are increased by 20.6%, 21.1%, and 54.4%, respectively in comparison with neat epoxy. In addition, the dispersion of MWCNTs in the epoxy-based matrix was investigated using scanning electron microscope (SEM). The SEM images depict that MWCNTs are well dispersed leading to the enhancement of the mechanical properties of the nanocomposite.
机译：在这项研究中，将各种负载的0.3-1.0 wt％的多壁碳纳米管（MWCNT）掺入到环氧树脂中以制造纳米复合材料。通过热压工艺将厚度为0.2mm的纳米复合膜沉积在铝基板上。推导了膜/基底复合结构的模型II应变能释放速率的理论表达式。进行端部弯曲挠曲（ENF）测试以表征复合结构的II型断裂能。实验结果表明，随着纳米复合材料中MWCNT含量的增加，弹性模量，极限强度和II型断裂能也随之增加。在具有1.0wt％的MWCNT的纳米复合膜的情况下，与纯环氧树脂相比，弹性模量，极限强度和II型界面断裂韧性分别提高了20.6％，21.1％和54.4％。另外，使用扫描电子显微镜（SEM）研究了MWCNT在基于环氧树脂的基质中的分散性。 SEM图像表明，MWCNT分散得很好，从而增强了纳米复合材料的机械性能。

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