Tesis doctoral de Jordi Renart Canalias
The use of composite materials in the aircraft industry has been increasing in recent years due to their application in structural parts. To reduce the production costs of these components the join between skins and stiffeners is made by means of an adhesive. In order to guarantee that the bonded joint fulfils the structural requirements, experimental tests on specimens are done from the first development tasks and throughout the production stages. in the present work, an analysis of the experimental test methods to determine the quality of bonded joints has been performed – the quality of bonded joints depends on the quality of the surface preparation, the adhesive properties and the compatibility between the adhesive and the adherents. The work focuses on two objectives: the improvement of the double cantilever beam test, and the development of an alternative method of bonded joint characterization based on driving a wedge into the adhesive layer (wedge driven test, wdt). In the double cantilever beam test, a mechanical fixture tool has been designed and a data reduction method for stick-slip crack propagation has been developed. On the other hand, the alternative test method such as the dcb, focuses on determining the fracture toughness in mode i of the adhesive joint, by means of introducing a wedge inside the specimen at a constant speed rate. to prove the sensitivity of the wdt to the quality of the adhesive joint, a series of testing campaigns has been performed over 4 adhesive joint configurations (combining 2 adhesives and 2 adherents). Moreover, deliberately produced bad surface preparations have been tested. From the test results, it has been observed that the driven wedge test exhibits an equivalent behaviour to the double cantilever beam test and has a similar level of sensitivity to the quality of the bonded joint.
Datos académicos de la tesis doctoral «Desarrollo de un nuevo ensayo experimental para la evaluación de la calidad de uniones adhesivas entre componentes estructurales de composite para la industria aeronáutica«
- Título de la tesis: Desarrollo de un nuevo ensayo experimental para la evaluación de la calidad de uniones adhesivas entre componentes estructurales de composite para la industria aeronáutica
- Autor: Jordi Renart Canalias
- Universidad: Girona
- Fecha de lectura de la tesis: 10/09/2010
Dirección y tribunal
- Director de la tesis
- Josep Costa Balanzat
- Tribunal
- Presidente del tribunal: José María Pintado sanJuan benito
- axel Fink (vocal)
- Jaime aurelio Viña olay (vocal)
- silvia Lazcano ureña (vocal)