Uncovering the toughening mechanisms of bonded joints through tailored CFRP layup

Lima, R.A.A.; Tao, Ran; Bernasconi, A.; Carboni, M.; Carrère, Nicolas; Saeedifar, Milad

doi:10.1016/j.compositesb.2023.110853

Cited by 9 publications

(1 citation statement)

References 27 publications

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“…Fibre-reinforced composite-bonded structures are one of the key ways to solve the problem of lightweight in the manufacturing industry, which has considerable application prospects in aerospace [1], automotive [2], shipbuilding [3], and wind power energy [4]. Among them, fibre-reinforced composites (FRPs) have the advantages of high specific strength to stiffness, lightweight, corrosion resistance and designability [5], replacing an increasing proportion of metal substrates in modern structures, and their usage is even considered one of the indicators of product advancement [6].…”

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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