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Multivariate Evaluation of BNNP/Epoxy Nanocomposite Adhesives: From Characterisation to Joint Fracture.
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DOI：10.1016/j.ijadhadh.2026.104356.png)
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Abstract
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The challenge of bonding dissimilar metals in structural applications necessitates high-performance adhesives with enhanced mechanical and dynamic stability. This study investigates the effect of Boron Nitride Nanoplates (BNNPs) reinforcement on the performance of two-part epoxy adhesive used for bonding aluminium alloy 2024 (AA2024) to stainless steel 304 (SS304). Epoxy-based nanocomposite formulations were systematically prepared at four BNNP concentrations (0.5, 1.0, 1.5, 2.0 wt.%). The study included characterisation (impact, flexural, TGA and DMA) of bulk epoxy-BNNP composites and bond performance evaluation (lap shear strength and mode-I fracture toughness) under static conditions. Result identified the 1.5 wt.% BNNP as the optimal concentration, achieving a substantial increase of 22.45% in impact strength, 36.24% in flexural strength, 13.5% in lap shear strength and 43.63% enhancement in the static fracture toughness over neat adhesive. Furthermore, the optimal 1.5 wt.% formulation was subjected to dynamic loading to characterise its strain-rate sensitivity. The modified adhesive exhibited positive rate dependence. Dynamic lap shear strength and fracture toughness increased by 47.59% and 210.62% respectively, compared to the corresponding static tests, indicating that the BNNPs addition may enhance performance in structural joints.
Keywords:
Boron Nitride Nanoplates
Epoxy Adhesive
Mechanical Properties
Fracture Toughness
Dynamic Loading
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