The effect of environment on the fatigue of bonded composite joints. Part 1: testing and fractography |
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| Affiliation: | 1. Department of Mechanical Engineering, Loughborough University, Leicestershire, LE11 3TU, UK;2. School of Mechanical and Materials Engineering, University of Surrey, Guildford, GU2 5XH, UK;3. Structural Materials Centre, DERA, Farnborough, Hants, GU14 0LX, UK;1. Indian Institute of Technology, Bhubaneswar, Odisha 752050, India;2. Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, United Kingdom;1. INEGI, Rua Dr Roberto Frias 400, 4200-465 Porto, Portugal;2. ENSTA - Bretagne, 2 rue François Verny, 29806 Brest Cedex 9, France;3. FEUP, Rua Dr Roberto Frias s/n, 4200-465 Porto, Portugal;4. ISEP, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, Portugal;1. Department of Mechanical Engineering, Faculty of Engineering, University of Porto, Portugal;2. Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), Porto, Portugal;1. Sir Lawrence Wackett Aerospace Research Centre, School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;2. Cooperative Research Centre for Advanced Composite Structures, 1/320 Lorimer Street, Port Melbourne, Victoria 3207, Australia;3. Advanced Composite Structures Australia, 1/320 Lorimer Street, Port Melbourne, Victoria 3207, Australia |
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| Abstract: | In this work, the effect that test environment and pre-conditioning had on the fatigue behaviour of CFRP/epoxy lap–strap joints was investigated. It was shown that the fatigue resistance of the lap–strap joints did not vary significantly until the glass transition temperature, Tg, was approached, at which point a considerable reduction in the fatigue threshold load was observed. It was also noted that absorbed moisture resulted in a significant reduction in the Tg of the adhesive. This must be taken into account when selecting an adhesive to operate at elevated temperatures. The locus of failure of the joints was seen to be highly temperature dependent, transferring from primarily in the composite adherend at low temperatures to primarily in the adhesive at elevated temperatures. It was also seen that as the crack propagated along the lap–strap joint, the resolution of the forces at the crack tip tended to drive it into the strap adherend, which could result in complex mixed mode fracture surfaces. |
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