Creep behaviour and modelling of adhesively bonded CFRP-steel joints

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2025-01-20 DOI:10.1016/j.tws.2025.112981

Songbo Wang , Yanchen Fu , Jun Su , Zhuo Duan , Siyuan Yang

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引用次数: 0

Abstract

The performance of adhesively bonded joints is vital to the effectiveness of carbon fibre-reinforced polymer (CFRP) strengthening in steel structures. This study investigates the creep of CFRP-steel joints employing a combination of experimental testing and numerical analysis. A total of 10 characterisation tests were conducted on the strengthening adhesive to assess its thermal stability and viscoelastic creep properties. The findings revealed a significant increase in the creep rate as the temperature approached the adhesive's glass transition temperature (63.9 °C). Based on these results, a viscoelastic constitutive model, formulated using a Prony series, was developed and applied in the numerical analysis of the creep performance of CFRP-steel joints. Additionally, 6 sustained loading tests were performed on individual CFRP-steel joints, measuring creep displacement over periods of 7 and 12 days, which were used to validate the model's predictions. The experimental and numerical results showed a strong correlation, with a minimum R² value of 0.883. Extended numerical simulations, encompassing 60 scenarios, demonstrated that increasing the adhesive layer thickness significantly influences creep displacement, while variations in bond length have a relatively minor effect. After 30 days, a joint with a bond length of 13.5 mm and an adhesive thickness of 3.0 mm was predicted to exhibit a creep displacement of 62.5 μm, emphasising the importance of accounting for creep in design. The numerical modelling method based on material characterisation can be applicable for studying creep in various engineering adhesively bonded joints and offers valuable insights for optimising CFRP-steel joint designs in practical applications.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.