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This paper presents a study on the effect of composite patch repair on the fatigue life of an aluminum alloy plate containing two lateral cracks and subjected to cyclic tensile stresses applied to its upper and lower parts. The investigation considers several parameters, including the load ratio between minimum and maximum stresses (0, 0.3, 0.6, and 0.7), the cracking speed as a function of the stress intensity factor (ΔK), and the influence of the plate material. Among the alloys examined were 2024-T3, 2024-T351, and 7075-T73. The study identifies the material most resistant to cyclic loading. The plate is analyzed in both unrepaired and repaired conditions, with repairs performed using two different composite patches: boron/epoxy and graphite/epoxy. The results demonstrate that patch reinforcement significantly improves fatigue resistance, with boron/epoxy patches providing the greatest enhancement. The study concluded that the AL 2024-T3 material presents better results compared to the other two materials. These findings confirm the effectiveness of composite patching as a promising technique for extending the service life of cracked structures.

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Explainable AI based prediction of natural frequencies and modal damping in multi-delaminated MWCNT/GFRP composite plates Dhivya Elumalai, Mohit Gupta, Ananda B. Arumugam, Muthukumaran Gunasegeran, Amrita p. 85-100
Method for flexural bearing capacity of steel-concrete composite beam based on equivalent coefficient of compressive area of concrete slab Hu Ding, Faxing Ding, Chang He, Liping Wang, Fei Lyu p. 101-115
Assessment of seismic fragility of reinforced concrete buildings retrofitted with steel bracing elements : a numerical study Gürkan Tam, Burak Yön p. 117-129
Investigation of the effect of composite patch repair on the life of a plate with two lateral cracks Moulgada Abdelmadjid, Zagane Mohammed El Sallah, Ait Kaci Djafar, Sahli Abderahmane, Murat Yaylacı, İrem Mirzaloğlu, Mehmet Emin Özdemir, Ecren Uzun Yaylacı p. 131-138
Finite element analysis of reinforced concrete beams shear-strengthened with CFRP Palloma B. Soares, Américo Campos Filho, Paula M. Lazzari, Bruna M. Lazzari, Alexandre R. Pacheco p. 155-166
Composite damage modeling of recycled aggregate concrete beam on Winkler-Pasternak foundations : a multiphase mechanical approach Suchart Limkatanyu, Worathep Sae-Long, Nattapong Damrongwiriyanupap, Piti Sukontasukkul, Tanakorn Phoo-Ngernkham, Chayanon Hansapinyo, Tosporn Prasertsri, Panumas Saingam p. 139-153

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