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Study on Strength Optimization of CFRP Single-Lap Joints Based on Local Pre-Curing Effect

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Abstract:

The early failure of single-lap adhesive joints in carbon fiber reinforced polymer (CFRP) composites is typically induced by stress concentration at the edges of the overlap region. To address this issue, this study proposes a novel local pre-curing process system based on gradient thermal curing regulation. Through multi-physical field modeling of the temperature-curing coupling effect and a gradient curing control strategy, active optimization of the adhesive layer stress distribution is achieved. By optimizing the interface stress distribution, the proposed technique demonstrates the potential to enhance the overall joint performance by 3-6%. This research combines Abaqus finite element simulation and experimental verification. A CFRP single-lap joint model considering the temperature-curing coupling effect was established to analyze the influence of local pre-curing on the stress distribution of the adhesive layer. The results show that: 1. Local pre-curing can reduce the peel stress in the critical edge danger zone by about 3 - 5% while improving the shear strength in the middle region. 2. The preferential curing at the center of the adhesive layer can induce stress redistribution, relieve the stress concentration at the edges, and thus improve the overall load-bearing capacity of the joint. This study provides a low-cost and easily implementable solution for optimizing the performance of CFRP joints, showing potential applications in the field of lightweight aerospace structures. Through the synergistic effect of precise thermal management and regulation of the adhesive's rheological properties, it offers new insights for advanced composite joining technologies.

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Periodical:

Key Engineering Materials (Volume 1036)

Pages:

115-125

DOI:

https://doi.org/10.4028/p-3aipUR

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Online since:

December 2025

Authors:

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

Keywords:

Finite Element Simulation, Interface, Joint Strength, Process Optimization, Stress Redistribution

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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