复合材料胶接维修中的机械嵌锁理论研究

玻璃钢/复合材料 ›› 2019, Vol. 0 ›› Issue (8): 17-22.

复合材料胶接维修中的机械嵌锁理论研究

张华忠,杨文锋,李绍龙^*

中国民用航空飞行学院航空工程学院,广汉618307

收稿日期:2019-05-15 出版日期:2019-08-28 发布日期:2019-08-28
通讯作者: 李绍龙(1988-),男,副教授,主要从事航空复合材料性能与应用方面的研究,zlishaolong@163.com。
作者简介:张华忠(1989-),男,讲师,主要从事航空电磁材料性能方面的研究。
基金资助:
四川省科技厅重点项目(2019YFG0311,2018GZ0497);中国民航飞行学院面上项目(BJ2016-02,J2019-078,F2017KF06)

A THEORETICAL STUDY OF THE MECHANICAL INTERLOCKING ON THE BONDED COMPOSITE REPAIR

ZHANG Hua-zhong, YANG Wen-feng, LI Shao-long^*

Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan 618307, China

Received:2019-05-15 Online:2019-08-28 Published:2019-08-28

摘要/Abstract

摘要： 胶接维修是飞机复合材料维修的主要方式,胶接结合机理研究表明,机械嵌锁、静电吸附、化学结合是影响界面结合强度和维修效果的三大主要因素。然而,各种要素相互干扰,无法研究单因素结合机理在胶接中的作用。利用低表面能的氟碳助剂,在激光处理(Laser,LA)和抛光(Polish,PO)处理的复合材料层合板表面形成一层CF膜,采用激光共聚焦显微镜(LSCM)观察表面形貌和粗糙度,表征机械嵌锁作用;接触角计算表面自由能表征静电吸附作用;X射线光电子能谱(XPS)表征化学结合作用;单搭接剪切测试界面结合强度。结果表明,氟碳助剂处理后的表面形貌和粗糙度几乎无变化,PO-CF和LA-CF试样的表面能降低到10 mJ/m²左右,接触角升高到115°左右,能谱测试的C1s分峰谱图位置和强度相同。单搭接剪切力学性能测试结果表明,在静电吸附和化学结合作用相同的前提下,LA-CF样比PO-CF样的剪切强度大8.1 MPa,说明在本实验的界面结合机理研究中,机械嵌锁比静电吸附和化学结合所起到的作用要大。

关键词: 复合材料, 胶接, 机械嵌锁, 界面

Abstract: Bonded repair has been the primary maintenance way for composite aircraft structure. Mechanical interlocking, electrostatic adsorption and chemical bonding were employed to reveal the surface bonding mechanism and maintenance effect. However, it′s difficult to separate the three adhesion theories to study single-factor for the repair result. In this paper, fluorocarbon additive (CF) with low surface energy was used to form a CF film on the surface of laser-treated (LA-CF) and polish-treated (PO-CF) composite laminate. LSCM contact angle, XPS and lap shear test was applied to investigate morphologies and roughness (Sa), surface free energy, chemical property and adhesion strength, respectively. The results showed that PO-CF and LA-CF specimen did not change their morphologies and roughness. Howerver, the surface energy decreased to around 10 mJ/m² and the contact angle increased to around 115°. Deconvolution bands of the XPS C1s displayed the same peak location and intensity. Lap shear test revealed that the shear bonding strength of LA-CF was 8.1 MPa higher than that of the PO-CF specimen. It demonstrated that mechanical interlocking played a bigger role than electrostatic adsorption and chemical bonding in this mechanism research of interface combination.

Key words: carbon fibre reinforced polymer, bonded repair, mechanical interlocking, interface

中图分类号:

TB332

张华忠,杨文锋,李绍龙. 复合材料胶接维修中的机械嵌锁理论研究[J]. 玻璃钢/复合材料, 2019, 0(8): 17-22.

ZHANG Hua-zhong, YANG Wen-feng, LI Shao-long. A THEORETICAL STUDY OF THE MECHANICAL INTERLOCKING ON THE BONDED COMPOSITE REPAIR[J]. Fiber Reinforced Plastics/Composites, 2019, 0(8): 17-22.

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