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水分对复合材料与金属双搭接剪切接头影响的研究

A Study of the Effects of Moisture on Composite-to-Metal Double-Lap Shear Joints.

作者信息

Li Weidong, Zeng Rui, Zhang Qian, Duan Ziqi, Shen Pengfei, Zhong Xiangyu, Jiang Shicai, Bao Jianwen

机构信息

National Key Laboratory of Advanced Composites, AVIC Composite Technology Center, AVIC Composite Corporation Ltd., Beijing 101300, China.

College of Architecture and Art, Hefei University of Technology, Hefei 230009, China.

出版信息

Materials (Basel). 2024 Aug 2;17(15):3841. doi: 10.3390/ma17153841.

DOI:10.3390/ma17153841
PMID:39124506
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11312781/
Abstract

This work investigated the effects of moisture absorption treatment on composite-to-metal double-lap shear joints (DLSJs) bonded with epoxy adhesive film through experiments and simulations. The composite-to-metal DLSJ can be divided into five parts (the interface between the composite and adhesive, the interface between the adhesive and metal, the composite adherend, the metal adherend, and the adhesive layer). First, the wet-dependent properties of the adhesive and interfaces were obtained through adhesive tensile tests and GC tests, which showed that the properties of the adhesive and interfaces were significantly affected by the moist environment. Then, tensile tests of the composite-to-metal double-lap shear joints were carried out in dry and wet environments. Finally, based on the experimental investigations, a finite element (FE) model that considered cohesive damage was established for simulating damage evolution and predicting the failure loads and failure modes of the DLSJs. The results of both the experimental and numerical tests show that the DLSJ failure load decreases significantly after immersion in 95 °C water, and the major failure mode transfers from adhesive failure to interface failure. The research results provide a theoretical basis or basic data for the structural design of adhesively bonded composite-to-metal.

摘要

本研究通过实验和模拟，研究了吸湿处理对采用环氧胶膜粘结的复合材料-金属双搭接剪切接头（DLSJs）的影响。复合材料-金属双搭接剪切接头可分为五个部分（复合材料与胶粘剂之间的界面、胶粘剂与金属之间的界面、复合材料被粘物、金属被粘物和胶粘剂层）。首先，通过胶粘剂拉伸试验和气相色谱试验获得了胶粘剂和界面的湿敏性能，结果表明，潮湿环境对胶粘剂和界面的性能有显著影响。然后，在干燥和潮湿环境下对复合材料-金属双搭接剪切接头进行了拉伸试验。最后，基于实验研究，建立了一个考虑内聚损伤的有限元（FE）模型，用于模拟损伤演化并预测双搭接剪切接头的失效载荷和失效模式。实验和数值试验结果均表明，在95℃水中浸泡后，双搭接剪切接头的失效载荷显著降低，主要失效模式从胶粘剂失效转变为界面失效。研究结果为复合材料-金属粘结结构设计提供了理论依据或基础数据。

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