RT info:eu-repo/semantics/doctoralThesis
T1 Development of electromagnetic-based approaches for non-destructive evaluation and health monitoring of aerospace structural joints
A1 Mazzeschi, Mattia
A2 Universidad de Valladolid. Escuela de Doctorado
K1 Aeronáutica
K1 Aerospace Structures
K1 Estructuras Aeroespaciales
K1 Friction Stir Welding
K1 Soldadura por Fricción
K1 Thermoplastic Welding
K1 Soldadura Termoplástica
K1 Structural Health Monitoring
K1 Salud Estructural
K1 33 Ciencias Tecnológicas
AB The increasing use of lightweight materials such as aluminium alloys and carbon fibre reinforced polymers (CFRP) in the aerospace industry has created a need for advanced, reliable non-destructive evaluation (NDE) and structural health monitoring (SHM) techniques. These materials are widely used in critical structural applications, where their performance, durability, and integrity directly impact safety. Consequently, the ability to monitor and assess the quality of aerospace joints, both during the manufacturing process and throughout their service life, is essential. This research focuses on the development of electromagnetic-based approaches for monitoring aerospace structural joints, specifically friction stir welded (FSW) aluminium alloys and thermoplastic welded CFRP laminates. The thesis is divided into two main applications, each representing a distinct case where an electromagnetic-based approach was developed and optimized for a specific type of joint. The first application addresses the real-time process monitoring of FSW aluminium joints (CASE I). Through a series of parametric studies and numerical simulations, the optimal design for an Eddy Current Testing (ECT) probe was identified, aimed at detecting subsurface defects, such as wormholes. Experimental results demonstrated the probe’s ability to accurately detect these defects, particularly on the lower surface of the joint, while establishing significant correlations between electrical conductivity, microhardness, and mechanical properties such as ultimate tensile strength (UTS). This highlights the potential of ECT as an effective method for real-time process monitoring in the manufacturing of aerospace joints.The second application focuses on the structural health monitoring of thermoplastic induction welded CFRP laminates (CASE II). In this context, two electromagnetic sensors were developed: the PM (Purely Magnetic) sensor, based on a purely magnetic approach, and the H (Hybrid) sensor, which integrates both magnetic and electric field measurements. While the PM sensor showed limitations in detecting dielectric variations within the weld, the H sensor exhibited superior sensitivity, particularly in capturing changes related to dielectric permittivity, making it highly effective for defect detection and localization in CFRP laminates. This work contributes to the advancement of electromagnetic NDE and SHM methods, with findings that pave the way for future integration of these techniques in real-time monitoring systems.
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/74682
UL https://uvadoc.uva.es/handle/10324/74682
LA eng
NO Escuela de Doctorado
DS UVaDOC
RD 21-feb-2025