Slow-growth disbond and delamination damage of a bonded composite-metal joint under fatigue loading

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING

Composites Part A: Applied Science and Manufacturing Pub Date : 2025-02-19 DOI:10.1016/j.compositesa.2025.108816

Laurence Wong , John Wang , Richard Chunhui Yang , Y.X. Zhang

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Abstract

This study investigates the slow-growth damage behaviours of bonded CFRP-Al hybrid double-lap joints. Static tensile tests were performed to evaluate the residual strength of partially disbonded or delaminated joints. Fatigue tests were conducted at a practical load level based on static joint strength and safety factor requirements to measure fatigue life and crack growth rates. Finite element models were developed and calibrated using experimental residual strengths and the characteristic distance method and then employed to calculate the residual strengths and energy release rates as functions of crack lengths. The extended finite element method and virtual crack closure technique were both applied. The combination of experimental crack growth rates and numerical energy release rates yielded a modified Paris law, which was used to predict the fatigue life of the double-lap joints with gap region delamination. The fatigue test results revealed slow-growth delamination behaviour within the double-lap joint specimens with pre-embedded gap region delamination cracks. Following observations of crack migration from gap region disbond to first ply delamination, finite element analysis revealed the interaction that arises from disbond-delamination crack migration, with delamination growth remaining dominant and disbond growth significantly reducing. The fatigue life prediction for gap region delamination yielded good agreement with experimental joint fatigue life. This study implemented the previously proposed framework for assessing slow-growth damage behaviours of adhesively bonded composite joints.

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来源期刊

Composites Part A: Applied Science and Manufacturing 工程技术-材料科学：复合

CiteScore

15.20

自引率

5.70%

发文量

492

审稿时长

30 days

期刊介绍： Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.