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A novel approach to modelling the bond characteristics between CFRP fabrics and steel plate joints under quasi-static tensile loads

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Abstract

Carbon fiber-reinforced polymer (CFRP) materials have been effectively used as externally bonded sheets to repair damaged steel structures such as airplanes and ships. In this study, a series of double strap joints with different bonding lengths are considered and examined to experimentally and theoretically assess the effective bond length. Various models exist in the literature which are used to predict the strength of steel and CFRP joints under various loading conditions. Non-linear Lagrange stress method (NLS) which is a novel stress-based method for predicting the failure load values is presented for the first time. This approach is based on 2D and 3D linear elastic finite element analysis. Relying only on two experimental tests, the new approach proposed here can quickly and easily predict the failure load in steel/CFRP samples. In this methodology, it is assumed that the adhesive joint will fail as the normal stress along the adhesive mid-line reaches a predetermined value at a critical distance. In addition, experimental data on steel/CFRP joints gathered from the literature are compared to predictions using the NLS method. It was found that results from the theoretical predictions (NLS) were in good agreement with experimental tests conducted on double strap joints. It was also revealed that the average accuracy of the NLS method is superior to other methods such as cohesive zone model and Hart-Smith. The results revealed that under the best conditions, the NLS model is 5 times more accurate than existing models.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran

    Hemad Hamedi

  2. Department of Metallurgical & Materials Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

    Ata Kamyabi-Gol

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  1. Hemad Hamedi
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H. Hamedi carried out the numerical analysis and respective data analysis, performed the validation study and sketched the paper. A. Kamyabi-Gol built and revised the paper until final form.

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Correspondence to Hemad Hamedi.

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Hamedi, H., Kamyabi-Gol, A. A novel approach to modelling the bond characteristics between CFRP fabrics and steel plate joints under quasi-static tensile loads. Int J Adv Manuf Technol 116, 3247–3261 (2021). https://doi.org/10.1007/s00170-021-07714-y

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