Effects of bondline defects on the bond behaviour of CFRP-steel double strap joints

Wu, Chao; Yu, Yang-Zhe; Tam, Lik‐ho; He, Li

doi:10.1016/j.compstruct.2023.116682

Cited by 12 publications

(1 citation statement)

References 48 publications

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“…The advantages of basalt fibre-reinforced composites (BFRP) over other FRP materials are the wide source of raw materials, lower cost, recyclability, and environmental friendliness [27], which have great potential for application in civil facilities. At present, the research on FRP-bonded joints mainly focuses on CFRP and GFRP [28][29][30][31], but the cost is an important reason for limiting its use in large quantities in the civil field, so it is worthwhile exploring the more economical BFRP. The mechanism of hygrothermal ageing of BFRP-bonded joints has not been fully elucidated.…”

Section: Introductionmentioning

confidence: 99%

Failure Study of BFRP Joints with Two Epoxy Adhesives under Hygrothermal Coupling

Niu,

Yang,

Lin

et al. 2023

Polymers

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Basalt Fibre Reinforced Polymer (BFRP)-bonded structures are lightweight, high strength, economical, and environmentally friendly, which is very advantageous in the civil sector. The aim of this paper is to provide a comprehensive account of the hygrothermal degradation and failure mechanisms of BFRP-bonded structures by comparing the residual properties of two epoxy adhesive BFRP single-lap joints after ageing for 240 h, 480 h, and 720 h in an extreme hygrothermal environment with pure water at 80 °C. The hydrophilicity and thermal stability of the two adhesives were firstly compared by water absorption and Thermogravimetric Analysis (TGA) tests, and the hygrothermal degradation of the molecular chains and the reduction in Tg were characterised by Fourier Transform Infra-Red (FTIR) spectroscopy and Differential Scanning Calorimetry (DSC) curves. The failure strength and load-displacement curves of the two joints were then compared, and it was found that the strength and stiffness had different trends, while the paired t-test was used to demonstrate the correlation between the failure strength and the adhesive Tg, as well as the difference in the failure mechanisms of the two joints caused by the water absorption rate. The analysis of macrosections and Scanning Electron Microscope (SEM) images summarised the process and reasons for the transition of the failure mode from fibre tearing to hybrid failure, and finally, the changes in elemental concentration and O/C values were analysed by Energy Dispersive X-ray Analysis (EDX), which proved that the degree of hydrolysis could not be used as a judgement of the degradation degree of the joint alone, and provided data support for the application of the BFRP-bonded structure in the humid and hot environment.

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Section: Introductionmentioning

confidence: 99%

Failure Study of BFRP Joints with Two Epoxy Adhesives under Hygrothermal Coupling

Niu,

Yang,

Lin

et al. 2023

Polymers

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Tensile and bending properties of sandwich films of carbon fiber reinforced thermoplastics‐polypropylene sheet processed by a simple hot‐press method

Xu,

Chu,

Rumon

et al. 2024

SPE Polymers

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To develop a material with strong impact resistance, bending direction and in‐plane direction, the tensile and bending properties of sandwich films obtained by placing and re‐pressing a compression‐molded polypropylene sheet between two sheets of carbon‐fiber‐reinforced thermoplastics (CFRTPs) were evaluated. Three types of CFRTP were investigated, and thermoplastic nylon 66, polyurethane, and polyphenylene sulfite were used as the resin base materials to wrap the carbon fiber. Regarding the tensile properties of the sandwich films, the Young's modulus and maximum stress values were lower compared with those of the CFRTP sheets, regardless of the resin base material. However, improvements in elongation properties of 97%, 109%, and 156%, respectively were found, transforming the film into a softer and stronger film. Regarding the bending properties of the sandwich films, the Young's modulus and maximum stress values were higher compared with those of the CFRTP sheet. To examine the influence of the number of layers, the five‐layer sheet, in which the sandwich film was placed in two CFRTP sheets, exhibited inferior elongation properties to the three‐layer sheet during the tensile test. However, the results of the bending test found a significant improvement in Young's modulus of approximately 2.5 times and final strength of approximately three times. We anticipate that this material could be applicable to components requiring specific mechanical properties in both bending and in‐plane directions in future applications.Highlights CFRTP sandwich sheets were fabricated using a simple hot‐press method. The sandwich sheet showed improved mechanical properties in the in‐plane directions. Both the tensile modulus and the bending modulus have reached the GPa‐order. The sandwich film in question had particularly excellent bending properties. The sandwich film showed dependence on the number of layers. In‐plane elasticity of the films was evaluated using a falling ball test.

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Introduction to Carbon Fiber-Reinforced Polymer Composite

Tam,

Wu,

Hou

et al. 2024

Molecular Simulation Investigations of Property Degradation in CFRP Composite

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Effects of bondline defects on the bond behaviour of CFRP-steel double strap joints

Cited by 12 publications

References 48 publications

Failure Study of BFRP Joints with Two Epoxy Adhesives under Hygrothermal Coupling

Failure Study of BFRP Joints with Two Epoxy Adhesives under Hygrothermal Coupling

Tensile and bending properties of sandwich films of carbon fiber reinforced thermoplastics‐polypropylene sheet processed by a simple hot‐press method

Introduction to Carbon Fiber-Reinforced Polymer Composite

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