Evaluation of bond properties of degraded CFRP-strengthened double strap joints

Batuwitage, Chamila Rajeev Jayanath; Fawzia, Sabrina; Thambiratnam, David; Al-Mahaidi, Riadh

doi:10.1016/j.compstruct.2017.04.015

Cited by 16 publications

(4 citation statements)

References 39 publications

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“…An electrochemical process denoted as accelerated corrosion has been used to replicate the service life of steel-CFRP structures in a corrosive environment. 42 Batuwitage et al 36,37 investigated the long-term durability of CFRP-steel double lap bonded joints aged by electrochemical corrosion. The tensile strength of the aged CFRP-steel adhesive joints was significantly reduced, and CFRP rupture occurred.…”

Section: Introductionmentioning

confidence: 99%

Influence of accelerated corrosion on bi-material steel-CFRP double-lap joints bonded with thick adhesive

Jaiswal

Kumar

Rooms

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Bi-material steel-composite joints attract interest for marine applications. The marine environment imposes corrosion which is a prolonged process. This work presents a two-electrode electrochemical setup for accelerating free corrosion of the steel surfaces of bi-material joints. It is used to study the impact of accelerated corrosion on the mechanical performance of bi-material double lap specimens subjected to quasi-static tensile testing. Several test series have been conducted to evaluate the influence of overlap length and bond line thickness on shear strength and failure mode. Sixty specimens with a thick layer of methyl methacrylate adhesive have been fabricated and cured at room temperature for at least 24 h. Subsequently, 30 specimens were aged by subjecting them to electrochemical corrosion for 24 h. All specimens were tested for failure in quasi-static tensile loading while monitoring the strain fields in the joint area using digital image correlation. The measurements reveal a homogeneous shear strain field at the onset of loading, with a rapidly increasing shear strain concentration near the edges of the bond line preceding final failure. Both a decrease in the adhesive thickness and an increase in the overlap length increase the shear strength. Higher shear strength was observed for the electrochemically aged specimens than that of non-aged specimens. This is attributed to the faster residual curing of the adhesive during ageing because an increasing percentage of copper ions (released from the anode) accelerates the curing of the MMA adhesive. The electrochemically aged specimens showed mixed failure modes, i.e. cohesive failure and adhesive failure at the interface between steel and adhesive, and skin failure within the composite laminates.

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Section: Introductionmentioning

confidence: 99%

Influence of accelerated corrosion on bi-material steel-CFRP double-lap joints bonded with thick adhesive

Jaiswal

Kumar

Rooms

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…In recent years, with the rapid development of the high-speed train industry, lightweight design has become a mainstream element of train body manufacturing. The lightweight structure not only increases the running speed of the train, but also has several advantages against traditional steel and aluminum structure in terms of energy utilization, manufacturing cost, and carbon footprint [1,2]. Among the common structural materials, carbon fiber reinforced polymer (CFRP) material is considered to be the best candidate for lightweight design due to its high strength-to-weight ratio, superior corrosion resistance, and excellent mechanical properties at elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

Jointing of CFRP/5083 Aluminum Alloy by Induction Brazing: Processing, Connecting Mechanism, and Fatigue Performance

Guo

Gou

et al. 2022

Coatings

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Carbon fiber reinforced polymer (CFRP) is widely used in the lightweight design of high-speed trains due to its high specific strength. In order to further reduce the weight of the high-speed train body, it is necessary to study the joining process and fatigue properties of CFRP/aluminum alloys (CFRP/Al) structure. In this work, the CFRP plate and 5083P-O aluminum plate were successfully connected by an induction brazing method. The optimum parameters of induction brazing were determined to be an induction temperature of 290 °C, a normal pressure of 200 kPa, and a holding time of 5 s. After the 5083 plate was pre-anodized, the tensile strength of the CFRP/5083 joint reached a maximum value of 176.5 MPa. The anodization process introduced more surface micro-structures on the 5083 plate, leading to a better wetting behavior between CFRP and oxide film. Meanwhile, a new chemical bond, Al-O-C, was also formed at the interface of the CFRP/5083 joint. The fatigue limit of the CFRP/5083 joint was calculated to be 71.68 MPa through high-cycle fatigue (HCF) testing. The fatigue cracks initiated from the interface of CFRP/oxide film, and then propagated to base metal. Finally, the oxide film was peeled off from the base metal under shear stress, which contributed to the fracture of the CFRP/5083 joint. The bonding strength between CFRP and 5083 aluminum alloy is far from the conventional welded joints. Therefore, feasible approaches should be proposed to obtain a more robust bonding between CFRP and aluminum alloy in the future.

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“…A common technique of upgrading the performance of steel structures involves bonding FRP composites to targeted steel members. Several researchers investigated the effect of the bond: length, shear strength and stiffness on the performance, tensile strength and ductility of bonded FRP-steel joints [1][2][3]. Earlier researches classified six different failure modes for bonded FRP-steel systems: failure at the steel-adhesive interface, failure at the FRP-adhesive interface, adhesive layer failure, FRP delamination, FRP rupture and steel yielding [4][5].…”

Section: Introductionmentioning

confidence: 99%