铝基上多壁碳纳米管增强纳米复合薄膜的II型界面断裂韧性

Mode II Interfacial Fracture Toughness of Multi-Walled Carbon Nanotubes Reinforced Nanocomposite Film on Aluminum Substrate.

作者信息

Her Shiuh-Chuan, Chien Pao-Chu

机构信息

Department Mechanical Engineering, Yuan Ze University, Chung-Li 320, Taiwan.

出版信息

Nanomaterials (Basel). 2020 May 8;10(5):904. doi: 10.3390/nano10050904.

DOI:10.3390/nano10050904

PMID:32397129

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7279215/

Abstract

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.

摘要

在本研究中，将0.3 - 1.0 wt%范围内的多壁碳纳米管（MWCNTs）的各种负载量加入到环氧树脂中，以制备纳米复合材料。通过热压工艺在铝基板上沉积了厚度为0.2 mm的纳米复合薄膜。推导了薄膜/基板复合结构的II型应变能释放率的理论表达式。进行了端部切口弯曲（ENF）试验，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负载量的增加，弹性模量、极限强度和II型断裂能均增加。对于含有1.0 wt% MWCNTs的纳米复合薄膜，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%。此外，使用扫描电子显微镜（SEM）研究了MWCNTs在环氧基基体中的分散情况。SEM图像显示MWCNTs分散良好，从而导致纳米复合材料力学性能的增强。