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Fracture Analysis of MWCNT/Epoxy Nanocomposite Film Deposited on Aluminum Substrate

机译：铝基板上沉积的MWCNT /环氧纳米复合薄膜的断裂分析

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Multi-walled carbon nanotube (MWCNT) reinforced epoxy films were deposited on an aluminum substrate by a hot-pressing process. Three-point bending tests were performed to determine the Young’s modulus of MWCNT reinforced nanocomposite films. Compared to the neat epoxy film, nanocomposite film with 1 wt % of MWCNT exhibits an increase of 21% in the Young’s modulus. Four-point-bending tests were conducted to investigate the fracture toughness of the MWCNT/epoxy nanocomposite film deposited on an aluminum substrate with interfacial cracks. Based on the Euler-Bernoulli beam theory, the strain energy in a film/substrate composite beam is derived. The difference of strain energy before and after the propagation of the interfacial crack are calculated, leading to the determination of the strain energy release rate. Experimental test results show that the fracture toughness of the nanocomposite film deposited on the aluminum substrate increases with the increase in the MWCNT content.
机译：通过热压工艺在铝基板上沉积多壁碳纳米管（MWCNT）增强环氧膜。进行了三点弯曲测试，以确定MWCNT增强纳米复合材料薄膜的杨氏模量。与纯环氧膜相比，MWCNT为1 wt％的纳米复合膜的杨氏模量增加了21％。进行了四点弯曲试验，以研究沉积在具有界面裂纹的铝基板上的MWCNT /环氧纳米复合膜的断裂韧性。基于欧拉-伯努利梁理论，推导了薄膜/基底复合梁的应变能。计算了界面裂纹扩展前后的应变能差，从而确定了应变能释放率。实验测试结果表明，沉积在铝基板上的纳米复合膜的断裂韧性随着MWCNT含量的增加而增加。

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