Bond behavior of CFRP-to-steel interfaces with a typical ductile adhesive at low temperatures

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2025-04-15 DOI:10.1016/j.jcsr.2025.109577

Guo Dong, Mao Wei-An, Deng Jun, Zhong Min-Ting, Li Xiao-Da

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Abstract

Externally bonded (EB) carbon fiber-reinforced polymer (CFRP) composites are increasingly used to strengthen aging steel structures. In strengthened structures, the bond interface between CFRP and steel serves as the primary stress transfer pathway but may deteriorate under extreme temperatures. This study investigates the bond behavior between CFRP and steel over a temperature range of −40 °C to 25 °C. Single-lap CFRP-to-steel bonded joints were tested using a newly designed holding device that induced pure mode-II stress at the bonding interface. Load-displacement relationships and CFRP strain distributions were recorded, facilitating the determination of interfacial stress distributions and bond-slip relationships. The results showed that bond-slip characteristics transitioned from a tri-linear (elastic-plastic-softening) to a bi-linear (elastic-softening) configuration as the temperature decreased, accompanied by a continuous increase in interfacial shear stiffness and a reduction in interfacial fracture energy. In addition, the derived bond-slip relationships were used in finite element modeling and validated by their close alignment with experimental data. Finally, the individual effects of thermal stress or bond property variations on the bond strength were analyzed separately utilizing an analytical solution.

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来源期刊

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.