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Research on Fracture Mechanics of Non-Reciprocal Adhesive in Composite Single-Lap Bonded Joints Based on UEL

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Abstract:

Single-lap bonded joints are widely used in aerospace, shipbuilding, and other fields due to their advantages, such as light weight, high specific strength, and no stress concentration caused by hole-making or spot-welding. However, the traditional methods of increasing geometric parameters, such as lap length to improve strength, have limitations in scenarios where the bonding area is restricted. To solve this problem, in this study, it is assumed that carbon fibers with a volume fraction of 10% were introduced into the epoxy adhesive layer and arranged in a 45° orientation. The mechanical non-reciprocity was achieved by utilizing the difference in tensile and compressive moduli. A non-reciprocal cohesive fracture mechanics model of the composite single-lap joint structure based on the User-defined Element (UEL) was established to explore the effect of non-reciprocity on the bonding strength. The results show that the non-reciprocal adhesive layer effectively suppresses the peeling stress concentration at the cohesive failure interface of the adhesive layer, increasing the tensile strength of the single-lap bonded joint by approximately 6.27% compared to the traditional homogeneous adhesive layer, verifying the effectiveness of the model. This research breaks through the limitations of traditional geometric parameter optimization. It can specifically regulate the interfacial stress distribution without changing the bonding area, providing a new material design idea for strength optimization in scenarios where the bonding area is restricted, such as in aerospace. It has important theoretical significance and engineering application prospects.

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Periodical:

Key Engineering Materials (Volume 1036)

Pages:

127-138

DOI:

https://doi.org/10.4028/p-5c5yUt

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Online since:

December 2025

Authors:

Xin Qi Zhang*, Dan Wang, Jia Zheng Wang, Jian Wei Shi, Dong Chen

Keywords:

Directional Arrangement, Mechanical Non-Reciprocity, Single-Lap Bonded Joint, Tensile Strength, User-Defined Element

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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