Journal
COMPOSITE STRUCTURES
Volume 243, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.112250
Keywords
Adhesive Joints; Composite Structures; Fatigue modelling; High cycle; Fatigue
Categories
Funding
- Laboratorio Associado de Energia, Transportes e Aeronautica (LAETA) [UID/EMS/50022/2013]
- SciTech - Science and Technology for Competitive and Sustainable Industries [NORTE-01-0145-FEDER-000022]
- Fundacao para a Ciencia e a Tecnologia (FCT) [SFRH/BD/119336/2016, SFRH/BD/111516/2015]
- Programa Operacional Regional do Norte (NORTE2020), through Fundo Europeu de desenvolvimento Regional (FEDER)
- Fundação para a Ciência e a Tecnologia [SFRH/BD/111516/2015, SFRH/BD/119336/2016] Funding Source: FCT
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In this work, a numerical analysis of typical composite bonded repairs is performed aiming to establish a comparison between their performance under quasi-static and high-cycle fatigue loading. The studies include progressive damage analysis employing cohesive zone models suitable for quasi-static and high-cycle fatigue under mixed-mode I + II loading. Five repair geometries, e.g., Single-Strap, Double-Strap, Scarf, One-Stepped and Two-Stepped were analysed under three-point bending loading considering three different overlap lengths. In the quasi-static analysis, the focus was the initial stiffness, peak load and the corresponding displacement. Fatigue studies were executed under load control and under displacement control aiming to determine the fatigue lives. A final research addressed two of the embedded repairs, Scarf and Two-Stepped, reinforced with a bonded patch, which was verified to improve significantly fatigue resistance, especially in the case of the Scarf repair.
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